
Abstract
abstract class Animal{
public abstract void sound();
}
public class Dog extends Animal{
public void sound(){
System.out.println("Woof");
}
public static void main(String args[]){
Animal obj = new Dog();
obj.sound();
}
}
interface
interface MyInterface
{
public void method1();
public void method2();
}
class Demo implements MyInterface
{
public void method1()
{
System.out.println("implementation of method1");
}
public void method2()
{
System.out.println("implementation of method2");
}
public static void main(String arg[])
{
MyInterface obj = new Demo();
obj.method1();
}
}
※参考
beginnersbook.com
www.geeksforgeeks.org