Java : Why multiple inheritance not allowed in Java (Diamond Problem) and Solution

Why multiple inheritance not allowed in Java (Diamond Problem) and Solution 

Problem :

class A { 

int i; 

void msg() {

        System.out.println("From A");

    } 

}

class B { 

  int i;   

void msg() {

        System.out.println("From B");

    } 

}

class C extends A,B {         // suppose if this was possible

    public static void main(String[] args) { 

        super.msg();                 // which msg() method would be invoked?   

 }

}

Solution 1: Using interface’s reference

interface Moveable{

    default void run(){

        System.out.println("I am running, kid !!");

    }

}

  

interface Crawlable{

    default void run(){

        System.out.println("I am running, daddy !!");

    }

}

  

public class Animal implements Moveable, Crawlable {

    public static void main(String[] args)

    {

        Moveable.super.run(); 

         Crawlable.super.run();

    }

}

So solve above conflict, caller class must decide which run() method it want to invoke and then call using

 

Solution 2 : Using Tree pattern

public class Canine extends Animal{}

public class Dog extends Canine{}

Solution 3 : Creating Object Instances 

class mobile_phone { void call(){}}

class tablet {void big_screen(){} }

class phablet {

                mobile_phone m;

                tablet  t;

phablet(){

                m= new mobile_phone ();

                t=  new tablet  ();

}

test(){

m.call();

t.big_screen();

}