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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).
Java 8 introduces a new feature in the form of default methods for interfaces. [21] Basically it allows a method to be defined in an interface with application in the scenario when a new method is to be added to an interface after the interface class programming setup is done.
This is how for example java.util.concurrent classes are implemented, ... which are also the core feature of the Lisp programming language family. [113] Spreadsheets
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]
Swing is a platform-independent, "model–view–controller" GUI framework for Java, which follows a single-threaded programming model. [11] Additionally, this framework provides a layer of abstraction between the code structure and graphic presentation of a Swing-based GUI.
Java has no first-class functions, so function objects are usually expressed by an interface with a single method (most commonly the Callable interface), typically with the implementation being an anonymous inner class, or, starting in Java 8, a lambda. For an example from Java's standard library, java.util.Collections.sort() takes a List and a ...
A notable feature with the JVM languages is that they are compatible with each other, so that, for example, Scala libraries can be used with Java programs and vice versa. [ 8 ] Java 7 JVM implements JSR 292: Supporting Dynamically Typed Languages [ 9 ] on the Java Platform, a new feature which supports dynamically typed languages in the JVM.
For example, in Java, the Comparable interface specifies a method compareTo() which implementing classes must implement. This means that a sorting method, for example, can sort a collection of any objects of types which implement the Comparable interface, without having to know anything about the inner nature of the class (except that two of ...