Вывести 4 прямоугольника в окне

import java.lang.Math; 
 
class Rect{ 
int x1, y1, x2, y2; 
Rect(int x1, int y1, int x2, int y2){ 
this.x1 = x1; 
this.x2 = x2; 
this.y1 = y1; 
this.y2 = y2; 
 
} 
Rect union(Rect p){ 
Rect rr = new Rect(); 
rr.x1 = x1 < p.x1 ? x1 : p.x1; 
rr.y1 = y1 > p.y1 ? y1 : p.y1; 
rr.x2 = x2 > p.x2 ? x2 : p.x2; 
rr.y2 = y2 < p.y2 ? y2 : p.y2; 
 
return rr; 
} 
Rect intersection(Rect p){ 
Rect rr = new Rect(); 
rr.x1 = Math.max(p.x1,x1); 
rr.y1 = Math.min(p.y1,y1); 
rr.x2 = Math.min(p.x2,x2); 
rr.y2 = Math.max(p.y2,y2); 
 
return rr; 
} 
Rect(){} 
 
public String toString(){ 
return"[("+x1+","+y1+"),("+x2+","+y2+")]"; 
} }

import java.awt.*; 
import java.awt.event.WindowAdapter; 
import java.awt.event.WindowEvent; 
class RectFrame extends Frame{ 
 
 
RectFrame(Rect []r){ 
 
rr = r; 
setSize(400, 300); 
setVisible(true); 
addWindowListener(new WindowAdapter(){ 
public void windowClosing(WindowEvent l){ 
System.exit(0);}}); 
} 
 
public static void main(String args[]){ 
 
Rect r1 = new Rect(10, 20, 40, 70); 
Rect r2 = new Rect(30, 50, 20, 80); 
Rect r3 = r1.union(r2); 
Rect r4 = r1.intersection(r2); 
Rect r[] = {r3, r1, r2, r4}; 
new RectFrame(); 
} 
 
RectFrame(){} 
Rect rr[]; 
 
 
 
 
 
public void paint(Graphics g){ 
g.drawLine(5, 150, 370, 150); 
g.drawLine(200, 10, 200, 380); 
Color c[] = {Color.red, Color.green, Color.yellow, Color.blue}; 
 
for (int i = 0; i < 4; i++){ 
rr[i].x1 += 200; 
rr[i].x2 += 200; 
rr[i].y1 = 150 - rr[i].y1; 
rr[i].y2 = 150 - rr[i].y2; 
 
g.setColor(c[i]); 
g.fillRect(rr[i].x1, rr[i].y1, rr[i].x2 -rr[i].x1,(int)Math.abs(rr[i].y1 - rr[i].y2)); 
//g.fillRect(rr[i].x1,rr[i].y1,(int) Math.abs(rr[i].x2-rr[i].x1),(int) Math.abs(rr[i].y1-rr[i].y2)); 
} 
} 
 
 
}