What will be the output of the following Java program?interface calculate{void cal(int item);}class display implements calculate{int x;public void cal(int item){x = item * item; }}class interfaces{public static void main(String args[]){display arr = new display;arr.x = 0; arr.cal(2);System.out.print(arr.x);}}

Quiz on Java packages, core java api packages, interfaces and its types. Java interfaces are blueprints that define a set of methods that a class must implement. An interface is a reference type, similar to a class, but it cannot be instantiated. Instead, a class can implement an interface, which means that the class must provide implementations for all of the methods defined in the interface. A Java package is a set of classes, interfaces, and sub-packages that are similar. In Java, it divides packages into two types: built-in packages and user-defined packages. Built-in Packages (packages... Show more

Quiz on Java packages, core java api packages, interfaces and its types.

Java interfaces are blueprints that define a set of methods that a class must implement. An interface is a reference type, similar to a class, but it cannot be instantiated. Instead, a class can implement an interface, which means that the class must provide implementations for all of the methods defined in the interface.

A Java package is a set of classes, interfaces, and sub-packages that are similar. In Java, it divides packages into two types: built-in packages and user-defined packages. Built-in Packages (packages from the Java API) and User-defined Packages are the two types of packages (create your own packages).

Packages in Java are used to organize classes and interfaces. A package is a namespace that contains a set of related classes and interfaces. Packages can be nested, which means that a package can contain other packages.

Here are some examples of built-in packages in Java: java.lang, java.io, java.util, java.applet, java.awt, and java.net.

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