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2. Java (programming language) - Wikipedia

   en.wikipedia.org/wiki/Java_(programming_language)

   Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. It is a general-purpose programming language intended to let programmers write once, run anywhere (), [16] meaning that compiled Java code can run on all platforms that support Java without the need to recompile. [17]

3. Java syntax - Wikipedia

   en.wikipedia.org/wiki/Java_syntax

   If a class does not specify its superclass, it implicitly inherits from java.lang.Object class. Thus all classes in Java are subclasses of Object class. If the superclass does not have a constructor without parameters the subclass must specify in its constructors what constructor of the superclass to use. For example:

4. Java virtual machine - Wikipedia

   en.wikipedia.org/wiki/Java_virtual_machine

   A JVM language is any language with functionality that can be expressed in terms of a valid class file which can be hosted by the Java Virtual Machine. A class file contains Java Virtual Machine instructions (Java byte code) and a symbol table, as well as other ancillary information. The class file format is the hardware- and operating system ...

5. Interface (Java) - Wikipedia

   en.wikipedia.org/wiki/Interface_(Java)

   An interface in the Java programming language is an abstract type that is used to declare a behavior that classes must implement. They are similar to protocols.Interfaces are declared using the interface keyword, and may only contain method signature and constant declarations (variable declarations that are declared to be both static and final).

6. Object-oriented programming - Wikipedia

   en.wikipedia.org/wiki/Object-oriented_programming

   Classes may inherit from other classes, so they are arranged in a hierarchy that represents "is-a-type-of" relationships. For example, class Employee might inherit from class Person. All the data and methods available to the parent class also appear in the child class with the same names.

7. Java bytecode - Wikipedia

   en.wikipedia.org/wiki/Java_bytecode

   Java syntax is used for class or interface definition. Method bodies are specified using bytecode instructions. [7] Krakatau Bytecode Tools, currently contains three tools: a decompiler and disassembler for Java classfiles and an assembler to create classfiles. [8] Lilac, an assembler and disassembler for the Java virtual machine. [9]

8. Generics in Java - Wikipedia

   en.wikipedia.org/wiki/Generics_in_Java

   According to Java Language Specification: [5] A type variable is an unqualified identifier. Type variables are introduced by generic class declarations, generic interface declarations, generic method declarations, and by generic constructor declarations. A class is generic if it declares one or more type variables. [6]

9. Java Native Interface - Wikipedia

   en.wikipedia.org/wiki/Java_Native_Interface

   In software design, the Java Native Interface (JNI) is a foreign function interface programming framework that enables Java code running in a Java virtual machine (JVM) to call and be called by [1] native applications (programs specific to a hardware and operating system platform) and libraries written in other languages such as C, C++ and assembly.