Java Tutorial : Why Multiple Inheritance is supported using Interface?

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Java Tutorial : Why Multiple Inheritance is supported using Interface? 

InterfaceA.java

public interface InterfaceA
{
    void sayHi();       
}

InterfaceB.java

public interface InterfaceB
{
    void sayHi();
}

MyClass.java

public class MyClass implements InterfaceA,InterfaceB
{

    @Override
    public void sayHi()
    {
        System.out.println("Hi by MyClass");
    }

}

InterfaceTest.java

public class InterfaceTest
{

    public static void main(String[] args)
    {
        MyClass myClassObj = new MyClass();
        myClassObj.sayHi();

    }

}

Output

Hi by MyClass

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https://sites.google.com/site/javaee4321/java/InterfaceDemo-MultipleInheritance-Why-App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/InterfaceDemo-MultipleInheritance-Why-App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/fa67e02bcd9efeae1c2ea3019677c5252e4db5f7/BasicJava/InterfaceDemo-MultipleInheritance-Why-App/?at=master

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