Table of Contents
Java Language Specification Java SE 17 Edition Chapter 1 - Introduction
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“ (JSR-392 JvLngSpc17 2021)
“The Java programming language is a general-purpose, concurrent, class-based, object-oriented language. It is designed to be simple enough that many programmers can achieve fluency in the language. The Java programming language is related to C and C++ but is organized rather differently, with a number of aspects of C and C++ omitted and a few ideas from other languages included. It is intended to be a production language, not a research language, and so, as C. A. R. Hoare suggested in his classic paper on language design, the design has avoided including new and untested features.” (JSR-392 JvLngSpc17 2021)
“The Java programming language is strongly and statically typed. This specification clearly distinguishes between the compile-time errors that can and must be detected at compile time, and those that occur at run time. Compile time normally consists of translating programs into a machine-independent byte code representation.” (JvLngSpc17 2021)
”Run-time activities include loading and linking of the classes needed to execute a program, optional machine code generation and dynamic optimization of the program, and actual program execution.“ (JvLngSpc17 2021)
“The Java programming language is a relatively high-level language, in that details of the machine representation are not available through the language. It includes automatic storage management, typically using a garbage collector, to avoid the safety problems of explicit deallocation (as in C's free or C++'s delete).” (JvLngSpc17 2021)
”High-performance garbage-collected implementations can have bounded pauses to support systems programming and real-time applications. The language does not include any unsafe constructs, such as array accesses without index checking, since such unsafe constructs would cause a program to behave in an unspecified way.“ (JvLngSpc17 2021)
“The Java programming language is normally compiled to the bytecode instruction set and binary format defined in The Java Virtual Machine Specification, Java SE 17 Edition.” (JvLngSpc17 2021)
1
1.1
Organization of the Specification
1.1 Organization of the Specification
”Chapter 2 describes grammars and the notation used to present the lexical grammar and syntactic grammars for the language.“ (JvLngSpc17 2021)
”Chapter 3 describes the lexical structure of the Java programming language, which is based on C and C++. The language is written in the Unicode character set. It supports the writing of Unicode characters on systems that support only ASCII.“ (JvLngSpc17 2021)
”Chapter 4 describes types, values, and variables. Types are subdivided into primitive types and reference types.“ (JvLngSpc17 2021)
“The primitive types are defined to be the same on all machines and in all implementations, and are various sizes of two's-complement integers, IEEE 754 floating-point numbers, a boolean type, and a Unicode character char type. Values of the primitive types do not share state.” (JvLngSpc17 2021)
”Reference types are the class types, the interface types, and the array types. The reference types are implemented by dynamically created objects that are either instances of classes or arrays. Many references to each object can exist. All objects (including arrays) support the methods of the class Object, which is the (single) root of the class hierarchy]]. A predefined String class supports Unicode character [[strings. Classes exist for wrapping primitive values inside of objects. In many cases, wrapping and unwrapping is performed automatically by the compiler (in which case, wrapping is called boxing, and unwrapping is called unboxing). Classes and interfaces may be generic, that is, they may be parameterized by reference types. Parameterized types of such classes and interfaces may then be invoked with specific type arguments.“ (JvLngSpc17 2021)
”Variables are typed storage locations. A variable of a primitive type holds a value of that exact primitive type. A variable of a class type can hold a null reference or a reference to an object that is an instance of the named class or any subclass of that class. A variable of an interface type can hold a null reference or a reference to an instance of any class that implements the named interface. A variable of an array type can hold a null reference or a reference to an array. A variable of class type Object can hold a null reference or a reference to any object, whether class instance or array.“ (JvLngSpc17 2021)
”Chapter 5 describes conversions and numeric promotions. Conversions change the compile-time type and, sometimes, the value of an expression. These conversions include the boxing and unboxing conversions between primitive types and reference types. Numeric promotions are used to convert the operands of a numeric operator to a common type where an operation can be performed.“ (JvLngSpc17 2021)
There are no 2
Organization of the Specification
1.1
loopholes in the language; casts on reference types are checked at run time to ensure type safety.
Chapter 6 describes declarations and names, and how to determine what names mean (that is, which declaration a name denotes). The Java programming language does not require classes and interfaces, or their members, to be declared before they are used. Declaration order is significant only for local variables, local classes, local interfaces, and the order of field initializers in a class or interface. Recommended naming conventions that make for more readable programs are described here.
Chapter 7 describes the structure of a program, which is organized into packages.
The members of a package are classes, interfaces, and subpackages. Packages, and consequently their members, have names in a hierarchical name space; the Internet domain name system can usually be used to form unique package names.
Compilation units contain declarations of the classes and interfaces that are members of a given package, and may import classes and interfaces from other packages to give them short names.
Packages may be grouped into modules that serve as building blocks in the construction of very large programs. The declaration of a module specifies which other modules (and thus packages, and thus classes and interfaces) are required in order to compile and run code in its own packages.
The Java programming language supports limitations on external access to the members of packages, classes, and interfaces. The members of a package may be
accessible solely by other members in the same package, or by members in other
packages of the same module, or by members of packages in different modules.
Similar constraints apply to the members of classes and interfaces.
Chapter 8 describes classes. The members of classes are classes, interfaces, fields (variables) and methods. Class variables exist once per class. Class methods operate without reference to a specific object. Instance variables are dynamically created in objects that are instances of classes. Instance methods are invoked on instances of classes; such instances become the current object]] this during their execution, supporting the object-oriented programming]] style.
Classes support single inheritance, in which each class has a single superclass.
Each class inherits members from its superclass, and ultimately from the class Object. Variables of a class type can reference an instance of the named class or any subclass of that class, allowing new classes to be used with existing methods, polymorphically.
Classes support concurrent programming with synchronized methods. Methods
declare the checked exception]]s that can arise from their execution, which allows 3
1.1
Organization of the Specification
compile-time checking to ensure that exceptional conditions are handled. Objects can declare a finalize method that will be invoked before the objects are discarded by the garbage collector, allowing the objects to clean up their state.
For simplicity, the language has neither declaration ”headers“ separate from the implementation of a class nor separate type and class hierarchies]].
A re[[stricted]] kind of class, enum classes, supports the definition of small sets of values and their manipulation in a type safe manner. Unlike enumerations in other languages, enum constants are objects and may have their own methods.
Another re[[stricted]] kind of class, record classes, supports the compact expression of simple objects that serve as aggregates of values.
Chapter 9 describes interfaces. The members of interfaces are classes, interfaces, constant fields, and methods. Classes that are otherwise unrelated can implement the same interface. A variable of an interface type can contain a reference to any object that implements the interface.
Classes and interfaces support multiple inheritance from interfaces. A class that implements one or more interfaces may inherit instance methods from both its superclass and its superinterfaces.
Annotations are metadata that may be applied to declarations in a program, as well as to the uses of types in declarations and expressions. The form of an annotation is defined by an annotation interface, a specialized kind of interface. Annotations are not permitted to affect the semantics of programs in the Java programming language in any way. However, they provide useful input to various tools.
Chapter 10 describes arrays. Array accesses include bounds checking. Arrays are
dynamically created objects and may be assigned to variables of type Object. The language supports arrays of arrays, rather than multidimensional arrays.
Chapter 11 describes exceptions, which are nonresuming and fully integrated with the language semantics and concurrency mechanisms. There are three kinds of exceptions: checked exception]]s, run-time exceptions, and errors. The compiler ensures that checked exception]]s are properly handled by requiring that a method
or constructor can result in a checked exception]] only if the method or constructor declares it. This provides compile-time checking that exception [[handlers exist, and aids programming in the large. Most user-defined exceptions should be checked
exceptions. Invalid operations in the program detected by the Java Virtual Machine result in run-time exceptions, such as NullPointerException. Errors result from
failures detected by the Java Virtual Machine, such as OutOfMemoryError. Most
simple programs do not try to handle errors.
4
Organization of the Specification
1.1
Chapter 12 describes activities that occur during execution of a program. A program is normally stored as binary file]]s representing compiled classes and interfaces. These binary file]]s can be loaded into a Java Virtual Machine, linked to other classes and interfaces, and initialized.
After initialization, class methods and class variables may be used. Some classes may be instantiated to create new objects of the class type. Objects that are class instances also contain an instance of each superclass of the class, and object creation involves recursive creation of these superclass instances.
When an object is no longer referenced, it may be reclaimed by the garbage collector. If an object declares a finalizer, the finalizer is executed before the object is reclaimed to give the object a last chance to clean up resources that would not otherwise be released. When a class is no longer needed, it may be unloaded.
Chapter 13 describes binary compatibility, specifying the impact of changes to classes and interfaces on other classes and interfaces that use the changed classes and interfaces but have not been recompiled. These considerations are of interest to developers of classes and interfaces that are to be widely distributed, in a continuing series of versions, often through the Internet. Good program development environments automatically recompile dependent code whenever a
class or interface is changed, so most programmers need not be concerned about
these details.
Chapter 14 describes blocks and statements, which are based on C and C++.
The language has no goto statement, but includes labeled]] break and continue statement]]s. Unlike C, the Java programming language requires boolean (or Boolean) expressions in control-flow statements, and does not convert types to boolean implicitly (except through unboxing), in the hope of catching more errors at compile time. A synchronized statement provides basic object-level monitor
locking. A try statement]] can include catch and finally clauses to protect against non-local control transfers. Chapter 14 also describes patterns, which are used within statements (and expressions) to conditionally declare and initialize local variables.
Chapter 15 describes expressions. This document fully specifies the (apparent) order of [[evaluation of expression]]s, for increased determinism and portability.
Overloaded methods and constructors are resolved at compile time by picking the
most specific method or constructor from those which are applicable.
Chapter 16 describes the precise way in which the language ensures that local variables are definitely set before use. While all other variables are automatically initialized to a default value, the Java programming language does 5
1.2
not automatically initialize local variables in order to avoid masking programming errors.
Chapter 17 describes the semantics of threads and locks, which are based on the monitor-based concurrency originally introduced with the Mesa programming
language. The Java programming language specifies a memory model for shared-
memory multiprocessors that supports high-performance implementations.
Chapter 18 describes a variety of type inference algorithms used to test applicability of generic methods and to infer types in a generic method invocation.
Chapter 19 presents a syntactic grammar for the language.
1.2 Example Programs
Most of the example programs given in the text are ready to be executed and are
public static void main(String[] args) {
for (int i = 0; i < args.length; i++)
System.out]].print(i == 0 ? args[i] : ” “ + args[i]);
}
}
On a machine with the Oracle JDK installed, this class, stored in the file Test.java, can be compiled and executed by giving the commands:
1.3 Notation
Throughout this specification we refer to classes and interfaces drawn from the Java SE Platform API. Whenever we refer to a class or interface (other than those declared in an example) using a single identifier N, the intended reference is to the class or interface named N in the package java.lang. We use the canonical name
(§6.7) for classes or interfaces from packages other than java.lang.
6
Relationship to Predefined Classes and Interfaces
1.4
Non-normative information, designed to clarify the specification, is given in smaller, indented text.
This is non-normative information. It provides intuition, rationale]], advice, examples, etc.
To shorten the description of some rules, especially those that systematic]]ally analyze the constructs of the Java programming language, the customary
abbreviation “iff” is used to mean “if and only if”.
The type system of the Java programming language occasionally relies on the notion of a substitution. The notation [ F1:= T1,…, Fn:= Tn] denotes substitution of Fi by Ti for 1 ≤ i ≤ n.
1.4 Relationship to Predefined Classes and Interfaces
As noted above, this specification often refers to classes and interfaces of the Java SE Platform API. In particular, some classes and interfaces have a special relationship with the Java programming language. Examples include classes such as Object, Class, ClassLoader, String, and Thread, and the classes and interfaces in the package java.lang.reflect, among others. This specification
constrains the behavior of such classes and interfaces, but does not provide a complete specification for them. The reader is referred to the Java SE Platform API documentation.
Consequently, this specification does not describe reflection in any detail.
Many linguistic constructs have analogs in the Core Reflection API
(java.lang.reflect) and the Language Model API (javax.lang.model), but
these are generally not discussed here. For example, when we list the ways in which an object can be created, we generally do not include the ways in which the Core Reflection API can accomplish this. Readers should be aware of these additional
mechanisms even though they are not mentioned in the text.
1.5 Preview Feature]]s
A preview feature]] is:
7
1.5
Preview Feature]]s
that is fully specified, fully implemented, and yet impermanent. It is available in implementations of a given release of the Java SE Platform to provoke developer
feedback]] based on real world use; this may lead to it becoming permanent in a future release of the Java SE Platform.
Implementations must disable, at both compile time and run time, the preview feature]]s defined by a given release of the Java SE Platform, unless the user indicates via the host system, at both compile time and run time, that preview feature]]s are to be enabled.
The preview feature]]s defined by a given release of the Java SE Platform are enumerated in the Java SE Platform Specification for that release. The preview feature]]s are specified as follows:
changes (“diffs”) to The Java Language Specification for that release. The specifications of preview language features are in[[corporated into The Java
Language Specification by reference, and made a part thereof, if and only if preview feature]]s are enabled at compile time.
Java SE 17 defines one preview language feature: Pattern Matching for switch.
The standalone document which specifies this preview feature]] is available at the Oracle web [[site which hosts The Java Language Specification: https://
docs.oracle.com/javase/specs/.
The rules for use of preview language features are as follows:
feature, causes a compile-time error.
– The reference appears in a declaration that is annotated to suppress preview
warnings (§9.6.4.5).
– The reference appears in an import declaration (§7.5).
When preview feature]]s are enabled, Java compilers are strongly en[[couraged to give a non-suppressible warning for every source code reference to a preview language feature.
Details of this warning are beyond the scoped of The Java Language Specification, but the intent should be to alert programmers to the possibility of code being affected by future changes to preview language features.
8
Feedback]]
1.6
Some preview APIs are described as reflective by the Java SE Platform Specification, principally in the java.lang.reflect, java.lang.invoke, and javax.lang.model packages. The rule for use of reflective preview APIs is as follows:
– The declaration where the reference appears is within the same module as the
declaration of the reflective preview API element.
– The reference appears in a declaration that is annotated to suppress preview
warnings.
– The reference appears in an import declaration.
All preview APIs not described as reflective in the Java SE Platform Specification are normal. The rules for use of normal preview APIs are as follows:
– The declaration where the reference appears is within the same module as the
declaration of the normal preview API element.
true:
– The declaration where the reference appears is within the same module as the
declaration of the normal preview API element.
– The reference appears in a declaration that is annotated to suppress preview
warnings.
– The reference appears in an import declaration.
1.6 Feedback]]
Readers are invited to report technical errors and ambiguities in The Java
Language Specification to jls-jvms-spec-comments@openjdk.java.net.
9
1.7
Questions concerning the behavior of javac]] (the reference compiler for the Java
programming language), and in particular its conformance to this specification, may be sent to compiler-dev@openjdk.java.net.
1.7 References
Apple [[Computer. Dylan Reference Manual. Apple [[Computer Inc., Cupertino, California.
Bobrow, Daniel G., Linda G. DeMichiel, Richard P. Gabriel, Sonya E. Keene, Gregor Kiczales, and David A. Moon. Common Lisp Object System Specification, X3J13 Document 88-002R, June 1988; appears as Chapter 28 of Steele, Guy. Common Lisp: The Language, 2nd ed. Digital Press, 1990, ISBN 1-55558-041-6, 770-864.
Ellis, Margaret A., and Bjarne Stroustrup. The Annotated C++ Reference Manual. Addison-Wesley, Reading, Massachusetts, 1990, reprinted with correction]]s October 1992, ISBN
0-201-51459-1.
Goldberg, Adele and Robson, David. Small[[talk-80: The Language. Addison-Wesley, Reading, Massachusetts, 1989, ISBN 0-201-13688-0.
Harbison, Samuel. Modula-3. Prentice Hall, Englewood Cliffs, New Jersey, 1992, ISBN
0-13-596396.
Hoare, C. A. R. Hints on Programming Language Design. Stanford University Computer Science Department Technical Report No. CS-73-403, December 1973. Reprinted in SIGACT/SIGPLAN Symposium on Principles of Programming Languages. Association for Computing Machinery, New York, October 1973.
IEEE. IEEE Standard for Floating-Point Arithmetic. IEEE Std 754-2019 (Revision of IEEE
754-2008). July 2019, ISBN 978-1-5044-5924-2.
Kernighan, Brian W., and Dennis M. Ritchie. The C Programming Language, 2nd ed. Prentice Hall, Englewood Cliffs, New Jersey, 1988, ISBN 0-13-110362-8.
Madsen, Ole Lehrmann, Birger Møller-Pedersen, and Kristen Nygaard. Object-Oriented Programming]] in the Beta Programming Language. Addison-Wesley, Reading, Massachusetts, 1993, ISBN 0-201-62430-3.
Mitchell, James G., William Maybury, and Richard Sweet. The Mesa Programming Language, Version 5.0. Xerox PARC]], Palo Alto, California, CSL 79-3, April 1979.
Stroustrup, Bjarne. The C++ Programming Language, 2nd ed. Addison-Wesley, Reading, Massachusetts, 1991, reprinted with correction]]s January 1994, ISBN 0-201-53992-6.
Unicode Consortium, The. The Unicode Standard, Version 13.0. Mountain]] View, California, 2020, ISBN 978-1-936213-26-9.
10
Fair Use Sources
Java Vocabulary List (Sorted by Popularity)
Java Programming Language, Java Virtual Machine (JVM), Java Development Kit (JDK), Java Runtime Environment (JRE), Java Class, Java Interface, Java Method, Java Object, Java Package, Java String, Java Integer, Java Array, Java List, Java Map, Java Set, Java Exception, Java Thread, Java Synchronization, Java Generic, Java Annotation, Java Stream, Java Lambda Expression, Java Inheritance, Java Polymorphism, Java Encapsulation, Java Abstraction, Java Access Modifier, Java Constructor, Java Overloading, Java Overriding, Java Collection Framework, Java ArrayList, Java HashMap, Java HashSet, Java LinkedList, Java TreeMap, Java TreeSet, Java Iterator, Java Enumeration, Java File, Java InputStream, Java OutputStream, Java Reader, Java Writer, Java BufferedReader, Java BufferedWriter, Java PrintWriter, Java PrintStream, Java Scanner, Java StringBuilder, Java StringBuffer, Java Character, Java Boolean, Java Double, Java Float, Java Byte, Java Short, Java Long, Java BigInteger, Java BigDecimal, Java ClassLoader, Java Reflection, Java Proxy, Java Dynamic Proxy, Java Inner Class, Java Static Nested Class, Java Anonymous Class, Java Enum, Java Autoboxing, Java Auto-Unboxing, Java Garbage Collection, Java Memory Model, Java Just-In-Time Compilation, Java Classpath, Java Module, Java Module Path, Java Record, Java Sealed Class, Java Switch Expression, Java Pattern Matching for instanceof, Java Text Block, Java Var Keyword, Java Interface Default Method, Java Interface Static Method, Java Functional Interface, Java SAM (Single Abstract Method) Interface, Java Optional, Java Stream API, Java Collectors, Java Parallel Streams, Java Concurrency Package, Java Executor, Java ExecutorService, Java Future, Java CompletableFuture, Java ForkJoinPool, Java ReentrantLock, Java Semaphore, Java CountDownLatch, Java CyclicBarrier, Java Phaser, Java BlockingQueue, Java ConcurrentHashMap, Java AtomicInteger, Java AtomicLong, Java AtomicReference, Java AtomicBoolean, Java Lock Interface, Java ReadWriteLock, Java Condition, Java ThreadLocal, Java Synchronized Keyword, Java Volatile Keyword, Java Notify, Java Wait, Java Monitor, Java ReentrantReadWriteLock, Java ConcurrentLinkedQueue, Java PriorityQueue, Java Deque, Java ArrayDeque, Java SortedMap, Java SortedSet, Java NavigableMap, Java NavigableSet, Java EnumSet, Java EnumMap, Java WeakHashMap, Java LinkedHashMap, Java LinkedHashSet, Java IdentityHashMap, Java TreeMap Comparator, Java HashCode, Java Equals Method, Java CompareTo Method, Java Cloneable Interface, Java Serializable Interface, Java Externalizable Interface, Java Serialization Mechanism, Java ObjectOutputStream, Java ObjectInputStream, Java Transient Keyword, Java Persistence, Java JDBC (Java Database Connectivity), Java SQL Package, Java PreparedStatement, Java ResultSet, Java DriverManager, Java Connection, Java Statement, Java CallableStatement, Java RowSet, Java Bean, Java PropertyDescriptor, Java Introspector, Java BeanInfo, Java Enterprise Edition, Java Servlet, Java ServletContext, Java HttpServlet, Java HttpServletRequest, Java HttpServletResponse, Java Session, Java Filter, Java Listener, Java JSP (Java Server Pages), Java Expression Language, Java JSTL (JavaServer Pages Standard Tag Library), Java JDBC RowSet, Java DataSource, Java JNDI (Java Naming and Directory Interface), Java RMI (Remote Method Invocation), Java RMI Registry, Java RMI Stub, Java RMI Skeleton, Java RMI Remote Interface, Java CORBA Support, Java IDL, Java NamingException, Java InitialContext, Java Context Lookup, Java Message Service (JMS), Java Mail API, Java Bean Validation, Java Security Manager, Java Policy, Java Permission, Java AccessController, Java PrivilegedAction, Java KeyStore, Java TrustStore, Java SSLContext, Java Cipher, Java MessageDigest, Java KeyFactory, Java SecretKey, Java PublicKey, Java PrivateKey, Java Certificate, Java SecureRandom, Java SecureClassLoader, Java GSS-API (Generic Security Services), Java SASL (Simple Authentication and Security Layer), Java JAAS (Java Authentication and Authorization Service), Java Kerberos Integration, Java PKI (Public Key Infrastructure), Java JCE (Java Cryptography Extension), Java JCA (Java Cryptography Architecture), Java AWT (Abstract Window Toolkit), Java Swing, Java JFrame, Java JPanel, Java JLabel, Java JButton, Java JTextField, Java JTextArea, Java JScrollPane, Java JList, Java JComboBox, Java JTable, Java JTree, Java JDialog, Java JOptionPane, Java JProgressBar, Java JSlider, Java JSpinner, Java BoxLayout, Java BorderLayout, Java FlowLayout, Java GridLayout, Java GridBagLayout, Java CardLayout, Java LayoutManager, Java Drag and Drop, Java Clipboard, Java ImageIO, Java BufferedImage, Java Graphics2D, Java Font, Java Color, Java GradientPaint, Java TexturePaint, Java Stroke, Java Shape, Java AffineTransform, Java Path2D, Java BasicStroke, Java RenderingHints, Java GraphicsEnvironment, Java Robot, Java PrintService, Java PrinterJob, Java Paint Event, Java SwingUtilities, Java Pluggable LookAndFeel, Java Metal LookAndFeel, Java Nimbus LookAndFeel, Java Accessibility API, Java Sound API, Java MIDI, Java Clip, Java AudioInputStream, Java Sequencer, Java Synthesizer, Java Line, Java Port, Java Mixer, Java DataLine, Java Applet, Java Web Start, Java FX (JavaFX), Java SceneGraph, Java Node (JavaFX), Java Stage (JavaFX), Java Scene (JavaFX), Java Pane (JavaFX), Java GridPane, Java BorderPane, Java HBox, Java VBox, Java StackPane, Java AnchorPane, Java FlowPane, Java TilePane, Java Label (JavaFX), Java Button (JavaFX), Java TextField (JavaFX), Java TextArea (JavaFX), Java ChoiceBox, Java ComboBox (JavaFX), Java ListView, Java TableView, Java TreeView, Java WebView, Java Observable, Java Property (JavaFX), Java Binding (JavaFX), Java CSS (JavaFX), Java FXML, Java MediaPlayer, Java SwingNode, Java HTMLEditor (JavaFX), Java Concurrency in JavaFX, Java ScheduledExecutorService, Java Timer, Java TimerTask, Java ThreadPoolExecutor, Java WorkStealingPool, Java Callable, Java Runnable, Java FutureTask, Java LockSupport, Java Phaser Parties, Java Thread Dump, Java Heap Dump, Java Flight Recorder, Java Mission Control, Java JVMTI (JVM Tool Interface), Java JMX (Java Management Extensions), Java MBean, Java MBeanServer, Java MXBean, Java GarbageCollectorMXBean, Java MemoryMXBean, Java OperatingSystemMXBean, Java ThreadMXBean, Java CompilationMXBean, Java ClassLoadingMXBean, Java PlatformManagedObject, Java Instrumentation API, Java Attach API, Java JVMDebugger, Java JDWP (Java Debug Wire Protocol), Java JDI (Java Debug Interface), Java JShell, Java Scripting API, Java Nashorn (JavaScript Engine), Java XML Processing, Java DOM Parser, Java SAX Parser, Java StAX Parser, Java JAXB (Java Architecture for XML Binding), Java JAXP (Java API for XML Processing), Java SOAP, Java JAX-WS (Java API for XML Web Services), Java RESTful Web Services (JAX-RS), Java JSON Processing (JSON-P), Java JSON Binding (JSON-B), Java CDI (Contexts and Dependency Injection), Java EJB (Enterprise JavaBeans), Java JMS (Java Message Service), Java JTA (Java Transaction API), Java Bean Validation (JSR 380), Java Dependency Injection Frameworks, Java Spring Framework, Java Spring Boot, Java Hibernate (Java Persistence Framework), Java JPA (Java Persistence API), Java JAX-RPC (Java API for XML-based RPC), Java AppServer, Java GlassFish, Java WildFly, Java Liberty Profile, Java Tomcat, Java Jetty, Java Undertow, Java OSGi (Open Service Gateway Initiative), Java Pax Exam, Java RAP (Remote Application Platform), Java RCP (Rich Client Platform), Java Equinox, Java Tycho Build, Java Lombok, Java Guava, Java SLF4J (Simple Logging Facade for Java), Java Logback, Java JUL (Java Util Logging), Java Log4j, Java Commons Collections, Java Commons IO, Java Commons Lang, Java HTTPClient, Java URLConnection, Java URI Class, Java URL Class, Java Cookie Handler, Java HTTPServer, Java WebSocket API, Java AppletViewer, Java RMIClassLoader, Java JVMPauseDetector, Java Memory Settings, Java System Properties, Java Environment Variables (As Accessed by Java), Java ServiceLoader, Java SPI (Service Provider Interface), Java Instrumentation Rewriting, Java Agent Attaching, Java Runtime Exec, Java ProcessHandle, Java ProcessBuilder, Java ScriptingEngineManager, Java ScriptEngine, Java ScriptContext, Java CompiledScript, Java FX Application Thread, Java FXProperty, Java FXObservableValue, Java FXKeyFrame, Java FXTimeline, Java FXTransition, Java FXImageView, Java FXCanvas, Java FX3D Features, Java AOT Compilation (jaotc), Java GraalVM Integration, Java JNI (Java Native Interface), Java NIO (Non-Blocking I/O), Java Path, Java Files Class, Java FileSystem, Java FileChannel, Java AsynchronousFileChannel, Java Socket, Java ServerSocket, Java DatagramSocket, Java MulticastSocket, Java SocketChannel, Java ServerSocketChannel, Java DatagramChannel, Java Pipe, Java FileLock, Java MappedByteBuffer, Java CharsetDecoder, Java CharsetEncoder, Java SecretKeySpec, Java KeySpec, Java KeyPair, Java KeyAgreement, Java KeyGenerator, Java Mac (Message Authentication Code), Java PolicySpi, Java SecureRandomSpi, Java CertPath, Java CertPathBuilder, Java CertPathValidator, Java TrustManager, Java KeyManager, Java SSLSession, Java SSLSocket, Java SSLServerSocket, Java SSLEngine, Java SSLParameters, Java HttpsURLConnection, Java DomainCombiner, Java Principal, Java Subject, Java LoginContext, Java CallbackHandler, Java TextField (Swing), Java TextPane, Java StyledDocument, Java AttributeSet, Java StyleConstants, Java AbstractDocument, Java DocumentFilter, Java Caret, Java Highlighter, Java UndoManager, Java DefaultStyledDocument, Java ViewFactory, Java EditorKit, Java KeyStroke, Java ActionMap, Java InputMap, Java RootPane, Java GlassPane, Java LayeredPane, Java MenuBar, Java MenuItem, Java JMenu, Java JMenuItem, Java JCheckBoxMenuItem, Java JRadioButtonMenuItem, Java PopupMenu, Java Popup, Java TooltipManager, Java DesktopManager, Java InternalFrame, Java InternalFrameUI, Java InternalFrameAdapter, Java DockingFrames, Java SystemTray, Java TrayIcon, Java Robot Class, Java PrintServiceLookup, Java FlavorMap, Java Transferable, Java DataFlavor, Java DragGestureRecognizer, Java DropMode, Java DropTargetAutoScroll, Java DropTargetContext, Java DropTargetListener, Java DropTargetDragEvent, Java DropTargetDropEvent, Java BasicLookAndFeel Class, Java SynthLookAndFeel, Java UIDefaults, Java UIManager, Java ClientPropertyKey, Java ImageIOSpi, Java ImageWriter, Java ImageReader, Java ImageInputStream, Java ImageOutputStream, Java IIOMetadata, Java BufferedImageOp, Java ColorModel, Java WritableRaster, Java IndexColorModel, Java Raster, Java RenderedImage, Java WritableRenderedImage, Java ImageTranscoder, Java ImageWriterSpi, Java ImageReaderSpi, Java Soundbank, Java MidiChannel, Java MidiDevice, Java MidiEvent, Java Sequence, Java MidiFileFormat, Java SoundFont, Java AudioSystem, Java AudioFormat, Java DataLine.Info, Java LineEvent, Java LineListener, Java Clip Class, Java SourceDataLine, Java TargetDataLine, Java Port.Info, Java Mixer.Info, Java Gervill (SoftSynthesizer), Java AccessBridge, Java AWTEvent, Java KeyEvent, Java MouseEvent, Java FocusEvent, Java WindowEvent, Java ComponentEvent, Java AdjustmentEvent, Java ContainerEvent, Java InputMethodEvent, Java HierarchyEvent, Java InvocationEvent, Java PaintEvent, Java DropTargetEvent, Java Peer Interface, Java AWTEventMulticaster, Java Toolkit, Java Desktop, Java GraphicsConfiguration, Java GraphicsDevice, Java AWTKeyStroke, Java TextHitInfo, Java TextLayout, Java TextAttribute, Java FontRenderContext, Java AttributedString, Java LineBreakMeasurer, Java Bidi, Java BreakIterator, Java Collator, Java Locale, Java ResourceBundle, Java Formatter, Java Format Conversion, Java SimpleDateFormat, Java DecimalFormat, Java MessageFormat, Java ChoiceFormat, Java ScannerDelimiter, Java System.Logger, Java Logger, Java Level, Java LogRecord, Java ConsoleHandler, Java FileHandler, Java MemoryHandler, Java SocketHandler, Java SimpleFormatter, Java XMLFormatter, Java Preferences, Java PreferenceChangeEvent, Java NodeChangeEvent, Java PrinterException, Java PrinterAbortException, Java PrintException, Java PrintQuality, Java PrintServiceAttribute, Java ServiceUI, Java Pageable, Java Printable, Java Book, Java TablePrintable, Java StreamPrintService, Java StreamPrintServiceFactory, Java Filer (Annotation Processing), Java Messager, Java ProcessingEnvironment, Java Element, Java ElementKind, Java ElementVisitor, Java PackageElement, Java TypeElement, Java VariableElement, Java ExecutableElement, Java AnnotationMirror, Java AnnotationValue, Java AnnotationProcessor, Java RoundEnvironment, Java TypeMirror, Java DeclaredType, Java ArrayType, Java TypeVariable, Java WildcardType, Java NoType, Java ErrorType, Java UnionType, Java IntersectionType, Java JavacTool, Java StandardJavaFileManager, Java Diagnostic, Java DiagnosticCollector, Java ForwardingJavaFileManager, Java ForwardingJavaFileObject, Java ForwardingJavaFileObject, Java SPI ServiceLoader, Java ToolProvider, Java DocumentationTool, Java JavaCompiler, Java JShellTool, Java DiagnosticListener, Java CompilationTask, Java ModuleElement, Java ModuleLayer, Java ModuleDescriptor, Java ModuleFinder
OLD before GPT Pro: Abstract Classes, Abstract Methods, Abstract Window Toolkit, Access Control Exception, Access Modifiers, Accessible Object, AccessController Class, Action Event, Action Listener, Action Performed Method, Adapter Classes, Adjustment Event, Adjustment Listener, Annotation Processing Tool, Annotations, AnnotationTypeMismatchException, Anonymous Classes, Applet Class, Applet Context, Applet Lifecycle Methods, Application Class Data Sharing, Array Blocking Queue, Array Index Out of Bounds Exception, Array List, Array Store Exception, Arrays Class, Assertion Error, Assertions, Assignment Operator, Asynchronous File Channel, Atomic Boolean, Atomic Integer, Atomic Long, Atomic Reference, Attribute Set, Audio Clip, Authentication Mechanisms, Auto Closeable Interface, Auto Boxing, AWT Components, AWT Event Queue, AWT Listeners, AWT Toolkit, Backing Store, Background Compilation, Batch Updates, Bean Context, Bean Descriptors, Bean Info, Big Decimal Class, Big Integer Class, Binary Compatibility, Binding Utilities, Bit Set Class, Bitwise Operators in Java, Blocking Queue Interface, Boolean Class, Bounded Wildcards, Breakpoint, Buffered Input Stream, Buffered Output Stream, Buffered Reader, Buffered Writer, BufferOverflowException, BufferUnderflowException, Button Class, Byte Array Input Stream, Byte Array Output Stream, Byte Order, ByteBuffer Class, Bytecode Instructions, Bytecode Verifier, Callable Interface, Callable Statement, Calendar Class, Canvas Class, Card Layout, Caret Listener, Case Sensitivity in Java, Casting in Java, Catch Block, Certificate Exception, Character Class, Character Encoding, Character Set, Character.UnicodeBlock, Charset Class, Checked Exceptions, Checkbox Class, Choice Component, Class Class, Class Files, Class Loader, Class Loader Hierarchy, Class Loading Mechanism, Class Not Found Exception, Class Object, Class Path, ClassCastException, ClassCircularityError, ClassFormatError, ClassLoader, ClassNotFoundException, Clone Method, CloneNotSupportedException, Cloneable Interface, Clipboard Class, Cloneable Interface, ClosedChannelException, Collections Framework, Collections Utility Class, Collector Interface, Collectors Class, Color Class, Column Major Order, Comparable Interface, Comparator Interface, Compiler API, Compiler Directives, Compiler Optimization, Component Class, Component Event, Component Listener, Composite Pattern, ConcurrentHashMap, ConcurrentLinkedQueue, ConcurrentModificationException, ConcurrentNavigableMap, ConcurrentSkipListMap, ConcurrentSkipListSet, Condition Interface, Connection Interface, Console Class, Constructor Overloading, Consumer Interface, Container Class, ContainerEvent, Content Handler, ContentHandlerFactory, Context Class Loader, Continue Statement, Control Flow Statements, CountDownLatch Class, CRC32 Class, Credential Management, Critical Section, CyclicBarrier Class, Daemon Threads, Data Class, Data Input Interface, Data Input Stream, Data Output Interface, Data Output Stream, Data Truncation Exception, Date Class, Daylight Saving Time Handling, Deadlock in Java, Debugging Techniques, DecimalFormat Class, Default Methods in Interfaces, Deflater Class, Deprecated Annotation, Design Patterns in Java, Desktop Class, Diamond Operator, Dialog Class, Dictionary Class, DigestInputStream, DigestOutputStream, Direct Byte Buffer, DirectoryStream Interface, Document Object Model, DOM Parsing in Java, Double Brace Initialization, Double Class, Drag and Drop API, Driver Manager, Drop Shadow Effect, Dynamic Binding, Dynamic Proxy Classes, Element Interface, Ellipse2D Class, EmptyStackException, Encapsulation in Java, Enum Classes, Enum Constant, EnumSet Class, Enumeration Interface, EOFException, Error Handling in Java, Error Prone Practices, Event Delegation Model, Event Handling Mechanism, Event Listener Interfaces, Event Object, Event Queue, EventQueue Class, Exception Chaining, Exception Handling Mechanism, Executable Jar Files, Executor Interface, Executor Service, Executors Class, Expression Evaluation, Extends Keyword, Externalizable Interface, File Class, File Channel, File Descriptor, File Filter Interface, File Input Stream, File Lock Mechanism, File Output Stream, File Permission, File Reader, File Writer, FileDialog Class, FilenameFilter Interface, FileNotFoundException, Final Classes, Final Keyword, Finally Block, Finalize Method, Finalizer Guardian Idiom, Float Class, Flow Layout, Flow API, Focus Listener, Font Class, For Each Loop, ForkJoinPool Class, Formatter Class, Frame Class, Functional Interfaces, Future Interface, FutureTask Class, Garbage Collection Mechanism, Garbage Collector, Generics in Java, Generic Methods, Generic Types, Geometry Classes, Glyph Vector, GradientPaint Class, Graphics Class, Graphics2D Class, Grid Bag Constraints, Grid Bag Layout, Grid Layout, GregorianCalendar Class, Group Layout, GUI Components in Java, GZIPInputStream, GZIPOutputStream, Hash Collision, Hash Function, Hash Map Class, Hash Set Class, Hashtable Class, HashCode Method, Headless Exception, Heap Memory, Hello World Program in Java, Hierarchical Inheritance, High-Level Concurrency API, HTTP Client in Java, HTTP Server in Java, Icon Interface, Identifier Naming Convention, If Statement, IllegalArgumentException, IllegalMonitorStateException, IllegalStateException, IllegalThreadStateException, Image Class, ImageIcon Class, Immutable Classes, Import Statement, InaccessibleObjectException, Inheritance in Java, InitialContext Class, Inner Classes, Input Method Framework, Input Stream, InputStreamReader Class, Instance Initializer Block, Instance Variables, InstantiationException, Integer Class, Integer Overflow and Underflow, InterruptedException, InterruptedIOException, Interface in Java, InternalError, Internationalization, IO Exception, IO Streams in Java, Iterable Interface, Iterator Interface, Jar Entry, Jar File, JarInputStream Class, JarOutputStream Class, Java Access Bridge, Java Annotations, Java API Documentation, Java Applets, Java Archive (JAR), Java Beans, Java Bytecode, Java Class Library, Java Collections Framework, Java Community Process, Java Compiler, Java Database Connectivity (JDBC), Java Development Kit (JDK), Java Documentation Comments, Java Flight Recorder, Java Garbage Collector, Java Generics, Java Memory Model, Java Native Interface (JNI), Java Naming and Directory Interface (JNDI), Java Network Launching Protocol (JNLP), Java Platform, Java Plugin, Java Reflection API, Java Remote Method Invocation (RMI), Java Runtime Environment (JRE), Java Security Manager, Java Serialization, Java Server Pages (JSP), Java Stream API, Java Swing, Java Virtual Machine (JVM), Java Web Start, JavaFX Platform, javax Package, Javadoc Tool, JAR Signing Mechanism, JDBC API, JDBC Drivers, JFrame Class, JIT Compiler, JLabel Class, JLayeredPane Class, JList Component, JMenu Component, JOptionPane Class, JPanel Class, JPasswordField Component, JProgressBar Component, JScrollBar Component, JScrollPane Component, JSeparator Component, JSlider Component, JSplitPane Component, JTabbedPane Component, JTable Component, JTextArea Component, JTextField Component, JTextPane Component, JToolBar Component, JTree Component, JVM Arguments, JVM Memory Model, Key Event, Key Listener Interface, Key Stroke Class, KeyException, KeySpec Interface, Keyword in Java, Label Class, Lambda Expressions in Java, Layout Manager, LayoutManager2 Interface, Lazy Initialization, Leaf Nodes, Legacy Classes in Java, LineNumberReader Class, Linked Blocking Queue, Linked Hash Map, Linked Hash Set, Linked List Class, List Interface, List Iterator Interface, Listener Interfaces in Java, Load Factor in HashMap, Locale Class, Lock Interface, Logger Class, Logging API in Java, Long Class, Main Method in Java, MalformedURLException, Map Interface, Map.Entry Interface, Marker Interface, Math Class, Media Tracker, Memory Leak in Java, Memory Management in Java, Menu Class, Message Digest, Method Chaining, Method Overloading, Method Overriding, Methods in Java, MIDI Devices in Java, Mouse Adapter Class, Mouse Event, Mouse Listener Interface, Multi-Catch Exception, Multi-Level Inheritance, Multicast Socket, Multidimensional Arrays, Mutable Objects in Java, Naming Convention in Java, Native Methods, Navigable Map, Navigable Set, Nested Classes in Java, Network Interface Class, NoClassDefFoundError, NoSuchFieldException, NoSuchMethodException, Non-Blocking IO (NIO), Null Pointer Exception, Number Class, Number Format Exception, NumberFormat Class, Object Class, Object Cloning, Object Input Stream, Object Oriented Programming, Object Output Stream, Object Serialization in Java, Observer Pattern, Observable Class, OpenGL in Java, Optional Class, OutOfMemoryError, Override Annotation, Package Declaration, Packages in Java, Paint Interface, Panel Class, Parallel Garbage Collector, Parameter Passing in Java, ParseException, Path Interface, Pattern Class, Piped Input Stream, Piped Output Stream, PixelGrabber Class, Point Class, Polymorphism in Java, Prepared Statement, Primitive Data Types in Java, PrintStream Class, PrintWriter Class, Priority Blocking Queue, Priority Queue Class, Private Access Modifier, Process Class, Process Builder Class, Progress Monitor Class, Properties Class, Protected Access Modifier, Proxy Class, Public Access Modifier, Queue Interface, RadioButton Class, Random Access File, Reader Class, ReadWriteLock Interface, Rectangle Class, Recursive Methods, Reflection API in Java, Reference Queue, Regular Expressions in Java, Remote Method Invocation (RMI), Render Quality, Repeatable Annotations, Resource Bundle Class, Resource Leak in Java, ResultSet Interface, ResultSetMetaData Interface, Retry Logic in Java, Return Statement in Java, Runnable Interface, Runtime Class, Runtime Error, Runtime Exception, Runtime Permissions, Runtime Polymorphism, Scanner Class, Scheduling in Java, Script Engine, Scroll Bar Component, Scroll Pane Component, Security Exception, Security Manager, Semaphore Class, Sequence Input Stream, Serializable Interface, ServerSocket Class, Service Loader, Set Interface, Setter Methods, Shared Memory in Java, Short Class, Single Inheritance, Singleton Pattern in Java, Socket Class, SocketTimeoutException, Sorted Map, Sorted Set, Splash Screen, Spring Framework, SQLException, SSL Socket, Stack Class, StackOverflowError, Standard Edition of Java, StandardOpenOption, Statement Interface, StreamTokenizer Class, Strictfp Keyword, String Buffer Class, String Builder Class, String Class, String Constant Pool, StringIndexOutOfBoundsException, String Interning, String Literal in Java, String Pool in Java, String Tokenizer Class, Strong Typing in Java, Structural Patterns, Stub Class, Subclasses in Java, Superclass in Java, Supplier Interface, Support Classes, Swing Components, Swing Timer, Switch Statement in Java, Synchronized Block, Synchronized Method, System Class, System Properties in Java, Tab Pane Component, Table Model Interface, TCP Connection in Java, Template Method Pattern, Text Area Component, Text Field Component, Text Listener Interface, Thread Class, Thread Group, Thread Interruption, Thread Local Class, Thread Priority, Thread Safety in Java, Thread Scheduling, Throwable Class, Time Zone Class, Timer Class, Timer Task Class, Toolkit Class, ToolTip Manager, Transferable Interface, Transient Keyword, Tree Map Class, Tree Set Class, Try With Resources Statement, Type Erasure in Java, Type Inference in Java, Type Parameters, UI Manager Class, Unary Operator Interface, Unchecked Exceptions, UndeclaredThrowableException, Unicode Support in Java, Unmodifiable Collection, Unsafe Class, URL Class, URLConnection Class, URLDecoder Class, URLEncoder Class, URLStreamHandler Class, URLClassLoader Class, User Interface Components, Varargs in Java, Variable Arguments, Variable Scope in Java, Vector Class, Vendor-Specific Extensions, Viewport Class, Virtual Machine in Java, Volatile Keyword, Wait and Notify Methods, Weak Hash Map, Weak Reference, While Loop in Java, Wildcard Generic Types, Window Adapter Class, Window Event, Window Listener Interface, Wrapper Classes in Java, Write Once Run Anywhere, XML Binding in Java, XML Parsing in Java, XML Schema in Java, XPath Expression in Java, XSLT Transformation in Java, Yield Method in Thread, Zip Entry, Zip File, Zip Input Stream, Zip Output Stream, ZoneId Class, ZoneOffset Class
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