class Animal {    void move(){  System.out.println(  'Animal is moving.');     }  void eat(){    System.out.println(  'Animal is eating.');     } } class Dog extends Animal{    @Override void move(){     // move method from Base class is overriden in this  // method  System.out.println('Dog is running.');  }  void bark(){    System.out.println('Dog is barking.');     } } public class Geeks {  public static void main(String[] args)  {  Dog d = new Dog();  d.move();   d.eat();   d.bark();  } } 

class Parent{    void show(){    System.out.println('Parent's show()');  } } class Child extends Parent{    @Override  void show(){    super.show();  System.out.println('Child's show()');  } } public class Main{    public static void main(String[] args){    Parent obj = new Child();  obj.show();  } } 

class Parent{    // Can't be overridden  final void show(){    } } class Child extends Parent{    // This would produce error  void show() {} } 

class Parent{  static void staticMethod(){    System.out.println('Parent static method');  }  void instanceMethod(){    System.out.println('Parent instance method');  } } class Child extends Parent{    static void staticMethod(){    // Hides Parent's static method  System.out.println('Child static method');  }  @Override  void instanceMethod(){     // Overrides Parent's instance method  System.out.println('Child instance method');  } } public class GFG{    public static void main(String[] args){    Parent p = new Child();    // Calls Parent's static method (hiding)  p.staticMethod();    // Calls Child's overridden instance method  p.instanceMethod();   } } 

class Parent{    private void display(){    System.out.println('Parent private method');  } } class Child extends Parent{    void display(){    // This is a new method not overriding  System.out.println('Child method');  } } public class GFG{    public static void main(String[] args){    Child c = new Child();    // Calls Child's method  c.display();   } } 

class Parent{    Parent getObject(){    System.out.println('Parent object');  return new Parent();  } } class Child extends Parent{    @Override    // Covariant return type  Child getObject() {   System.out.println('Child object');  return new Child();  } } public class GFG{    public static void main(String[] args){    Parent obj = new Child();    // Calls Child's method  obj.getObject();     } } 

import java.io.IOException; class Parent {  void display() throws IOException {  System.out.println('Parent method');  } } class Child extends Parent {  @Override  void display() throws IOException {  System.out.println('Child method');  } } public class GFG{    public static void main(String[] args){    // Parent reference Child object  Parent obj = new Child();   try{    // Calls Child's overridden method  obj.display();   } catch (IOException e){    System.out.println('Exception caught: ' + e.getMessage());  }  } } 

abstract class Employee {  abstract void raiseSalary();  abstract void promote(); } class Manager extends Employee{  @Override void raiseSalary(){    System.out.println(  'Manager salary raised with incentives.');  }  @Override void promote(){    System.out.println(  'Manager promoted to Senior Manager.');  } } class Engineer extends Employee{    @Override void raiseSalary(){    System.out.println(  'Engineer salary raised with bonus.');  }  @Override void promote(){    System.out.println(  'Engineer promoted to Senior Engineer.');  } } public class Company{    public static void main(String[] args){    Employee[] employees  = { new Manager() new Engineer() };  System.out.println('--- Raising Salaries ---');  for (Employee e : employees){    e.raiseSalary();   }  System.out.println('n--- Promotions ---');  for (Employee e : employees) {  e.promote();  }  } }