Rotate Test

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class TetrisRotate extends JPanel{

    //Z Shape's coordinates
    int[][] array = {{1,0},  {0,0},   {0,-1},  { -1, -1 }};
    Point[] point = new Point[4];
    final int SCALE = 25;
    int curX = 5, curY = 5;

    public TetrisRotate(){
        JFrame frame = new JFrame("Tetris Rotate Test");
        frame.setSize(400,400);
        frame.setLocationRelativeTo(null);
        frame.add(this);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        this.setBackground(Color.DARK_GRAY);

        for(int i=0; i<4; ++i){
            point[i] = new Point(array[i][0],array[i][1]);
        }

        frame.addKeyListener(new KAdapter());
        frame.setVisible(true);
    }

    public void setX(int index, int x){
        point[index].x = x;
    }

    public void setY(int index, int y){
        point[index].y = y;
    }

    public int x(int index){
        return  point[index].x;
    }

    public int y(int index){
        return  point[index].y;
    }

    public void rotateLeft(){
        for(int i=0; i<4; ++i){
           this.setX(i,-y(i));
           this.setY(i, x(i));
        }
    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);

        g.setColor(new Color(80,5,5));
        for(int i=0; i<4; ++i){
            int x = curX + point[i].x;
            int y = curY + point[i].y;
            g.fill3DRect(x * SCALE, y * SCALE , SCALE, SCALE, true);
        }
    }

    class KAdapter extends KeyAdapter{
        @Override
        public void keyPressed(KeyEvent a) {
            int key = a.getKeyCode();
            if(key == KeyEvent.VK_LEFT){
                rotateLeft();
                repaint();
            }
        }
    }

    public static void main(String[] args) {
        new TetrisRotate();
    }
}