메소드 오버라이딩 만들기

class DObject {
     public DObject next;
 
     public DObject() {
          next = null;
     }
     public void draw () {
          System.out.println("Dobject draw");
     }
}

 

class Line extends DObject {
     public void draw() {    // 메소드 오버라이딩
          System.out.println("Line");
     }
}

 

class Rect extends DObject {
     public void draw() {    // 메소드 오버라이딩
          System.out.println("Rect");
     }
}

 

class Circle extends DObject {
     public void draw() {
          System.out.println("Circle");
     }
}

public class MethodOverringEx {
     public static void main(String [] args) {
          DObject obj = new DObject();
          Line line = new Line();
          DObject p = new Line();                 // 업캐스팅 됨
          DObject r = line;                            // 업캐스팅 됨
  
          obj.draw();                                  // DObject.draw() 메소드 실행. "DObject draw" 출력
          line.draw();                                 // Line.draw() 메소드 실행. "Line"출력
          p.draw();                                    // 오버라이딩된 메소드 Line.draw() 싱행, "Line" 출력
          r.draw();                                     // 오버라이딩된 메소드 Line.draw() 실행, "Line" 출력
  
          DObject rect = new Rect();
          DObject circle = new Circle();
          rect.draw();                                 // 오버라이딩된 메소드 Rect.draw() 실행, "Rect"출력
          circle.draw();                              // 오버라이된된 메소드 Circle.draw() 실행, "Circle" 출력
     }
}

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예제 - 명품 java Programming -