[9주차 실습] 4월 28일 Problem Set

The Point class and the main method is as follows. Implement the ColorPoint class and the Point3D class so that the following console window can be shown.

package April27;

public class Point {
	private int x, y;
	public Point(int x, int y) {
		this.x=x;
		this.y=y;
	}
	public int getX() {return x;}
	public int getY() {return y;}
	protected void move(int x, int y) {
		this.x=x;
		this.y=y;
	}
	
}

package April27;

public class ColorPoint extends Point{
	private String color;
	public ColorPoint(int x, int y, String color) {
		super(x, y);
		this.color=color;
	}
	
	public ColorPoint() {
		super(0,0);
		this.color="black";
	}
	
	public ColorPoint(int x, int y) {
		super(x, y);
		this.color="black";
	}
	public void setXY(int x, int y){
		move(x, y);
	}
	public void setColor(String color) {
		this.color=color;
	}
	
	public String toString() {
		String str = "The "+color+"point at ("+getX()+","+getY()+")";
	    return str;
	}
	
}

package April27;

public class Point3D extends Point{
	private int z;
	
	public Point3D(int x, int y, int z) {
		super(x, y);
		this.z=z;
	}
	
	public String toString() {
		String str="The point at ("+getX()+", "+getY()+", "+z+")";
		return str;
	}
	
	public void moveUp() {
		z++;
	}
	public void moveDown() {
		z--;
	}
	
	public void move(int x, int y, int z) {
		move(x, y); // 얘는 메소드 오버라이딩이 아님, 매개변수가 다르기 때문에 아님, 그래서 super 키워드를 쓰면 안 되고 바로 함수 호출해야함
		this.z=z;
	}
}

package April27;

public class PointExample {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		ColorPoint cp = new ColorPoint(5, 5, "yellow");
		cp.setXY(10, 20);
		cp.setColor("red");
		String str = cp.toString();
		System.out.println(str);
		
		ColorPoint zeroPoint=new ColorPoint();
		System.out.println(zeroPoint.toString());
		
		ColorPoint blackPoint=new ColorPoint(5,5);
		System.out.println(blackPoint.toString());
		
		Point3D p=new Point3D(1,2,3);
		System.out.println(p.toString());
		
		p.moveUp();
		System.out.println(p.toString());
		
		p.moveDown();
		System.out.println(p.toString());
		
		p.move(10, 10);
		System.out.println(p.toString());
		
		p.move(100,200, 300);
		System.out.println(p.toString());
	}

}

 실행결과