What is an Interface?

Java Programming Language > Interface in java > Introduction to Interface

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Answer:

An interface is a collection of abstract methods. A class implements an interface, thereby inheriting the abstract methods of the interface.

In Java, an interface is a blueprint of a class that contains only abstract methods (methods without a body) and constant fields. An interface is used to define a common behavior for multiple classes, allowing them to work together. Interfaces provide a way to achieve abstraction in Java and are used to define a contract that must be implemented by concrete classes. By implementing an interface, a class agrees to perform the behavior specified in the interface. Interfaces can also be extended by other interfaces, making it possible to define a hierarchy of behaviors.

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103. Give some features of Interface?

Answer:

Interface cannot be instantiated

An interface does not contain any constructors.

All of the methods in an interface are abstract.

In Java, some of the features of an interface include:

Abstract methods: Interfaces can only contain abstract method declarations, and they cannot contain method implementations.
No Constructors: Interfaces cannot contain constructor methods.
100% abstraction: Interfaces are 100% abstract, which means that they only contain abstract methods and constants.
Multiple inheritance: Interfaces allow multiple inheritance, which means that a class can implement more than one interface.
Strong typing: Interfaces enforce strong typing, which means that variables declared as an interface type must only be assigned reference values that implement that interface.
Accessibility: Interface methods are public by default and cannot be declared as private or protected.
Constants: Interfaces can contain constant declarations, which are public, static, and final by default.
Marker interfaces: An interface that does not contain any methods or constants is known as a marker interface, such as Serializable, Cloneable, and Remote.

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Question: Interface in java Short

104. Define Packages in Java?

Answer: A Package can be defined as a grouping of related types(classes, interfaces, enumerations and annotations ) providing access protection and name space management.

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Question: Packages in java Short

105. Why Packages are used?

Answer: Packages are used in Java in-order to prevent naming conflicts, to control access, to make searching/locating and usage of classes, interfaces, enumerations and annotations, etc., easier.

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Question: Packages in java Short

106. What do you mean by Multi-threaded program?

Answer: A multithreaded program contains two or more parts that can run concurrently. Each part of such a program is called a thread, and each thread defines a separate path of execution.

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Question: Multithreading in java Short

107. What are the two ways in which Thread can be created?

Answer: Thread can be created by: implementing Runnable interface, extending the Thread class.

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Question: Multithreading in java Short

108. What is an applet?

Answer: An applet is a Java program that runs in a Web browser. An applet can be a fully functional Java application because it has the entire Java API at its disposal.

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Question: Applet Programming Short

109. An applet extend which class?

Answer: An applet extends java.applet.Applet class.

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Question: Applet Programming Short

110. Explain garbage collection in Java?

Answer: It uses garbage collection to free the memory. By cleaning those objects that is no longer reference by any of the program.

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Question: Inheritance in java Short

111. Define immutable object?

Answer: An immutable object can

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Question: Interface in java Short

113. Explain Set Interface?

Answer: It is a collection of element which cannot contain duplicate elements. The Set interface contains only methods inherited from Collection and adds the restriction that duplicate elements are prohibited.

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