How to achieve multiple inheritance in Java using interfaces and default methods

Example 1: How to achieve multiple inheritance in Java using interfaces and default methods

KW.java

interface WhiteBank
{
    default void bonus()
    {
        System.out.println("WhiteBank Festival Bonus: 500");
    }
}
interface GreenBank
{
    default void gift()
    {
        System.out.println("GreenBank Festival Gift: 1000");
    }
}
class KW implements WhiteBank, GreenBank
{
    public static void main(String args[])
    {
        KW k=new KW();
        k.bonus();
        k.gift();
    }
}

Output

kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
WhiteBank Festival Bonus: 500
GreenBank Festival Gift: 1000
kodingwindow@kw:~$

Example 2: How to achieve multiple inheritance in Java using interfaces and default methods

KW.java

interface WhiteBank
{
    default void bonus()
    {
        System.out.println("WhiteBank Festival Bonus: 500");
    }
}
interface GreenBank
{
    default void bonus()
    {
        System.out.println("GreenBank Festival Bonus: 1000");
    }
}
class KW implements WhiteBank, GreenBank
{
    public void bonus()
    {
        WhiteBank.super.bonus();
        GreenBank.super.bonus();
    }
    public static void main(String args[])
    {
        KW k=new KW();
        k.bonus();
    }
}

Output

kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
WhiteBank Festival Bonus: 500
GreenBank Festival Bonus: 1000
kodingwindow@kw:~$

What Next?

Java Collections

Kodingwindow

Java Programming