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();
}
