import java.awt.*;
import javax.swing.*;

public class ColorAndLine extends JFrame{
 public ColorAndLine(){
  super("using color and line");
  setSize(800,400);
  setVisible(true);
 }
 public void paint(Graphics g){
  super.paint(g);
  while(true)
 {//System.out.print((int)(Math.random()*100));
     g.setColor(new Color((int)(Math.random()*250),(int)(Math.random()*250),(int)(Math.random()*250)));
  g.drawLine((int)(Math.random()*1000),(int)(Math.random()*1000),(int)(Math.random()*100),(int)(Math.random()*100));
 repaint();
 }
 }
 public static void main(String args[]){
  ColorAndLine application=new ColorAndLine();
  application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 }
}

修改

import java.awt.*;
import javax.swing.*;

public class ColorAndLine extends JFrame{
 static int i=0;
 public ColorAndLine(){
  super("using color and line");
  setSize(800,400);
  setVisible(true);
 }
 public void paint(Graphics g){
  
 // Gui gui=new Gui();
  super.paint(g);
  
  while(i<999999999)
 {//System.out.print((int)(Math.random()*100));
     g.setColor(new Color((int)(Math.random()*250),(int)(Math.random()*250),(int)(Math.random()*250)));
  g.drawLine((int)(Math.random()*1000),(int)(Math.random()*1000),(int)(Math.random()*1000),(int)(Math.random()*1000));
 repaint();
 Gui gui=new Gui();
 gui.start();
 i++;
 }
 }
 public static void main(String args[]){
  
  ColorAndLine application=new ColorAndLine();
  application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 }
}

class Gui extends Thread{
public Gui(){
 }
 public void run(){
  try{Thread.sleep(999999999);
  
  }
  catch(Exception e){
  }
 }
}

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