Example : Example to show Multiple Inheritance using Interface.
import java.io.*;
interface A
{
void display();
}
class B implements A
{
public void display()
{
System.out.println("Welcome India");
}
}
class C implements A
{
public void display()
{
System.out.println("Welcome World");
}
}
class D
{
public static void main(String args[])
{
A a=new C();
a.display();
A b=new B();
b.display();
}
}
Save as - A.java
Compile as - javac A.java
Interpreted/Run as - java D
Output:
Welcome World
Welcome IndiaExample : How to implement/use Multiple Interface in a Java class.
import java.io.*;
interface A
{
void display();
}
interface B
{
void output();
}
class C implements A,B
{
public void display ()
{
System.out.println("Welcome India");
}
public void output()
{
System.out.println("Welcome World");
}
public static void main(String args[])
{
C obj = new C();
obj.display ();
obj.output ();
}
}
Output:
Welcome India
Welcome World
--------- OR ----------
import java.io.*;
interface A
{
final int a=20;
}
interface B
{
void display();
}
class C implements A,B
{
public void display()
{
System.out.println("Codershelpline");
}
public static void main(String args[])
{
C obj=new C();
obj.display();
System.out.println(a);
}
}
Output:
Codershelpline.
20
--------- OR ----------
import java.io.*;
interface A
{
final int a=30;
}
interface B
{
void display();
}
class C implements A,B
{
public void display()
{
System.out.println("Hello India");
System.out.println(a);
}
public static void main(String args[])
{
C x=new C();
x.display();
}
}
Output:
Hello India
30Example : Example to show interface Inheritance.
import java.io.*;
interface A
{
public void display();
}
interface B extends A
{
public void output();
}
class C implements B
{
public void display()
{
System.out.println("Welcome India");
}
public void output()
{
System.out.println("Welcome World");
}
public static void main(String args[])
{
A a=new C(); //arise error due to no implementation directly.
B a = new C();
a.output();
a.display();
}
}
Output:
Welcome World
Welcome IndiaExample : A Java program to implement Interface (fails) when methods with the same name but different return types.
import java.io.*;
interface A
{
public void display();
}
interface B
{
public int display();
}
class C implements A,B
{
public void display()
{
}
public int display()
{
}
public static void main(String args[])
{
A a = new C();
a.display();
}
}
Output:
return type void is not compatible with intExample : Interface implementation with similar Variable names.
import java.io.*;
interface A
{
int a=50;
}
interface B
{
int a=500;
}
class C implements A,B
{
public static void main(String args[])
{
//System.out.println(a); generates ambiguity error
System.out.println(A.a);
System.out.println(B.a);
}
}
Output:
50
500Example : Example to show Interface using a static method.
import java.io.*;
interface A
{
static void display()
{
System.out.println("Codershelpline to all");
}
}
class B implements A
{
public static void main(String args[])
{
A.display();
}
}
Output:
Codershelpline to allExample : Example to show Interface using the default method.
import java.io.*;
interface A
{
default void display()
{
System.out.println("Hello India");
}
}
class B implements A
{
public static void main(String args[])
{
B x=new B();
x.display();
}
}
Output:
Hello IndiaExample : A Java program to show/use runnable Interface in a Java program.
class A implements Runnable
{
public void run()
{
// Code to be executed in a separate t1 and t2 thread
for (int i = 0; i < 5; i++)
{
System.out.println("Thread Id "+Thread.currentThread().getId() + " executed with " + i + " loop.");
}
}
public static void main(String[] args)
{
A obj = new A();
// Create a Thread object and pass the instance of A
Thread t1 = new Thread(obj);
Thread t2 = new Thread(obj);
// Start the t1 and t2 thread
t1.start();
t2.start();
}
}
Output:
Thread Id 12 executed with 0 loop.
Thread Id 11 executed with 0 loop.
Thread Id 12 executed with 1 loop.
Thread Id 11 executed with 1 loop.
Thread Id 12 executed with 2 loop.
Thread Id 11 executed with 2 loop.
Thread Id 12 executed with 3 loop.
Thread Id 12 executed with 4 loop.
Thread Id 11 executed with 3 loop.
Thread Id 11 executed with 4 loop.
----------------------- OR -------------------------
class A implements Runnable
{
public void run()
{
// Code to be executed in a separate t1 and t2 thread
for (int i = 0; i < 5; i++)
{
System.out.println("Thread Id "+Thread.currentThread().getId() + " executed with " + i + " loop.");
}
}
}
class B
{
public static void main(String[] args)
{
A obj = new A();
// Create a Thread object and pass the instance of A
Thread t1 = new Thread(obj);
Thread t2 = new Thread(obj);
// Start the t1 and t2 thread
t1.start();
t2.start();
}
}
Output:
Thread Id 11 executed with 0 loop.
Thread Id 12 executed with 0 loop.
Thread Id 11 executed with 1 loop.
Thread Id 11 executed with 2 loop.
Thread Id 11 executed with 3 loop.
Thread Id 11 executed with 4 loop.
Thread Id 12 executed with 1 loop.
Thread Id 12 executed with 2 loop.
Thread Id 12 executed with 3 loop.
Thread Id 12 executed with 4 loop.
----------------------- OR -------------------------
class A implements Runnable
{
public void run()
{
// Code to be executed in a separate t1 and t2 thread
for (int i = 0; i < 5; i++)
{
System.out.println("Thread Name "+Thread.currentThread().getName() + " executed with " + i + " loop.");
}
}
}
class B
{
public static void main(String[] args)
{
A obj = new A();
// Create a Thread object and pass the instance of A
Thread t1 = new Thread(obj);
Thread t2 = new Thread(obj);
// Start the t1 and t2 thread
t1.start();
t2.start();
}
}
Output:
Thread Name Thread-0 executed with 0 loop.
Thread Name Thread-1 executed with 0 loop.
Thread Name Thread-0 executed with 1 loop.
Thread Name Thread-1 executed with 1 loop.
Thread Name Thread-0 executed with 2 loop.
Thread Name Thread-1 executed with 2 loop.
Thread Name Thread-0 executed with 3 loop.
Thread Name Thread-1 executed with 3 loop.
Thread Name Thread-0 executed with 4 loop.
Thread Name Thread-1 executed with 4 loop.
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