Why multiple inheritance is not supported in Java

To reduce the complexity and simplify the language, multiple inheritances is not supported in java.

Since compile-time errors are better than runtime errors, java renders compile-time error if you inherit 2 classes. So whether you have the same method or different, there will be a compile-time error now.

In Java, we can achieve multiple inheritances only through Interfaces.

Example 1:

class A{
    void msg(){System.out.println("Hello");}
}
class B{
    void msg(){System.out.println("Welcome");}
}

public class C extends A, B{
    public static void main(String[] args) {
        C obj=new C();
        obj.msg();
    }
}
// Error: java: ‘{‘ expected

output:

Error: java: ‘{‘ expected

Example 2:

interface A{
    default void msg(){System.out.println("Hello");}
}
interface B{
    default void msg(){System.out.println("Welcome");}
}
public class C implements A, B{
    @Override
    public void msg(){
        A.super.msg();
        B.super.msg();
    }
    public static void main(String[] args) {
        C obj=new C();
        obj.msg();
    }
}

output :

Hello
Welcome