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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]
A snippet of Java code with keywords highlighted in bold blue font. The syntax of Java is the set of rules defining how a Java program is written and interpreted. The syntax is mostly derived from C and C++. Unlike C++, Java has no global functions or variables, but has data members which are also regarded as global variables.
A programming language specification can take several forms, including the following: An explicit definition of the syntax and semantics of the language. While syntax is commonly specified using a formal grammar, semantic definitions may be written in natural language (e.g., the approach taken for the C language), or a formal semantics (e.g., the Standard ML [3] and Scheme [4] specifications).
The object-oriented Simula programming language was used mainly by researchers involved with physical modelling, such as models to study and improve the movement of ships and their content through cargo ports. [10] Simula is generally accepted as being the first language with the primary features and framework of an object-oriented language. [11]
Java has an expressive system of references and allows for special behavior for garbage collection. A normal reference in Java is known as a "strong reference". The java.lang.ref package defines three other types of references—soft, weak, and phantom references. Each type of reference is designed for a specific use.
Representation of different software components for performing a hypothetical holiday reservation in UML. An interface description language or interface definition language (IDL) is a generic term for a language that lets a program or object written in one language communicate with another program written in an unknown language.
To use such libraries from another language, usually of higher-level, such as Java, Common Lisp, Scheme, Python, or Lua, a binding to the library must be created in that language, possibly requiring recompiling the language's code, depending on the amount of modification needed. [2]
The term "POJO" initially denoted a Java object which does not follow any of the major Java object models, conventions, or frameworks. It has since gained adoption as a language-agnostic term, because of the need for a common and easily understood term that contrasts with complicated object frameworks. [citation needed]