Static method in Interface in Java

22 Sep, 2021
Static Methods in Interface are those methods, which are defined in the interface with the keyword static. Unlike other methods in Interface, these static methods contain the complete definition of the function and since the definition is complete and the method is static, therefore these methods cannot be overridden or changed in the implementation class.Similar to Default Method in Interface, the static method in an interface can be defined in the interface, but cannot be overridden in Implementation Classes. To use a static method, Interface name should be instantiated with it, as it is a part of the Interface only.Below programs illustrate static methods in interfaces:Program 1: To demonstrate use of Static method in Interface.In this program, a simple static method is defined and declared in an interface which is being called in the main() method of the Implementation Class InterfaceDemo. Unlike the default method, the static method defines in Interface hello(), cannot be overridden in implementing the class. 
Java
// Java program to demonstrate// static method in Interface. interface NewInterface {     // static method    static void hello()    {        System.out.println("Hello, New Static Method Here");    }     // Public and abstract method of Interface    void overrideMethod(String str);} // Implementation Classpublic class InterfaceDemo implements NewInterface {     public static void main(String[] args)    {        InterfaceDemo interfaceDemo = new InterfaceDemo();         // Calling the static method of interface        NewInterface.hello();         // Calling the abstract method of interface        interfaceDemo.overrideMethod("Hello, Override Method here");    }     // Implementing interface method     @Override    public void overrideMethod(String str)    {        System.out.println(str);    }}
Hello, New Static Method Here
Hello, Override Method here
 
Program 2: To demonstrate Scope of Static method.In this program, the scope of the static method definition is within the interface only. If same name method is implemented in the implementation class then that method becomes a static member of that respective class. 
Java
// Java program to demonstrate scope// of static method in Interface. interface PrintDemo {     // Static Method    static void hello()    {        System.out.println("Called from Interface PrintDemo");    }} public class InterfaceDemo implements PrintDemo {     public static void main(String[] args)    {         // Call Interface method as Interface        // name is preceding with method        PrintDemo.hello();         // Call Class static method        hello();    }     // Class Static method is defined    static void hello()    {        System.out.println("Called from Class");    }}
Called from Interface PrintDemo
Called from Class
 
solokiran1
ruhelaa48
java-interfaces
Static Keyword
Java
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