상속, 다형성

public abstract class Employee {

 public String name;
 
 public void methodA(){
  System.out.println("Employee methodA");
 
 }
 
// public void method(){
//  System.out.println("Employee method");
// }
 public abstract void method();
} 


employee를 상속받은 engineer클래스

public class Engineer extends Employee {
 public void methodB(){
  System.out.println("Engineer methodB");
 
 }
 
 // 오버라이드
 public void method(){
  System.out.println("Engineer method");
 }
} 

employee를 상속받은 engineer클래스

public class Manager extends Employee {
 public void methodC(){
  System.out.println("Manager methodC);
 
 }
 
 // 오버라이드
 public void method(){
  System.out.println("Manager method");
 }
} 

public class ExamEx01 {

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
   Engineer e = new Engineer();
   e.methodA();
   e.methodB();
   e.method();
   
   Employee emp = new Engineer();
   emp.methodA();
   //emp.methodB(); 접근 불가
   emp.method(); // 자식클래스 메소드 오버라이딩
   
   emp = new Manager();
   emp.method(); // 자식클래스 메소드 오버라이딩
 }

}