캐스팅

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public class Ex {   public static void main(String[] args) {         // 인스턴스 생성후 메서드 ㅗ출         Circle c = new Circle();         Rectangle r = new Ractangle();         Triangle t = new Triangle();           c.draw();         r.draw();         t.draw();           // 업캐스팅          Shape s = new Circle();         s.draw();         Shape s = new Ractangle();         s.draw();         Shape s = new Triangle();         s.draw();           //polymorphismDraw()메서드를 이용해 각도형의 메서드 호출         polymorphismDraw(c);         polymorphismDraw(r);         polymorphismDraw(r);           //배열을 사용하여 업캐스팅을 활용하는 방법         // 세개의 인스턴의를 하나의 Shape 타입 배열에 저장         Shape[] sArr = {c,r,t};           for(int i = 0; i<sArr.length ; i++) {             sArr[i].draw();         }         // 향상된 for문         for(shape s1 : sArr) {             s1.draw();         }       }         // 각 인스턴스 내의 draw() 메서드를 호출하는 메서드 정의         // 상속관계를 일때 Shape 타입 변수 하나만으로 draw() 메서드 호출가능         public static void polymorphismDraw(Shape s) {         s.draw();                   }   }       class Shape {     public void draw(){         System.out.println("도형 그리기");     } }   class Circle{     @Override //annotaion     public void draw() {         System.out.println("원 그리기");     } }   class Rectangle{         System.out.println("사각형 그리기"); }   class Triangle{         System.out.println("삼각형 그리기"); } Colored by Color Scripter

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