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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