Multiple Inheritance in Java ?

• In Java we can achieve multiple inheritance by using interfaces.
• A class implements multiple interfaces or an interface extends multiple interfaces is called multiple Inheritance.

multiple inheritance

Program which a class multiple interfaces:

interface First {
    void method_one();
    public void duplicate_method();
}
interface Two {
    void method_two();
    void duplicate_method();
}
public class multipleInheritance implements First, Two  {
    @Override
    public void method_two() {
        System.out.println("method_two implementation");
    }

    @Override
    public void method_one() {
        System.out.println("method_one implementation");
    }

    @Override
    public void duplicate_method() {
        System.out.println("duplicate_method implementation");
    }

    public static void main(String[] args) {
    multipleInheritance mi = new multipleInheritance();
    mi.method_one();
    mi.method_two();
    mi.duplicate_method();
 }
}

Output:

Program which an interfaces extends multiple interfaces:

multiple interfaces

interface interfaceOne {
    public void method1();
    void duplicate_method();
}
interface interfaceTwo {
    public void method2();
    void duplicate_method();
}
interface testInterface extends interfaceOne, interfaceTwo {
    public void method3();
    void duplicate_method();
}
public class multipleInterfaces implements testInterface {
    @Override
    public void method1() {
        System.out.println("method1 implementation");
    }
    @Override
    public void method2() {
        System.out.println("method2 implementation");
    }
    @Override
    public void method3() {
        System.out.println("method3 implementation");
    }
    @Override
    public void duplicate_method() {
        System.out.println("duplicate_method");
    }
    public static void main(String[] args) {
    multipleInterfaces mi=new multipleInterfaces();
    mi.method1();
    mi.method2();
    mi.method3();
    mi.duplicate_method();
 }
}

Output:

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