line10.java

可以随机的画10条随机颜色的随机长度的直线的小程序.

//Line10.java
import java.awt.*;
import java.applet.Applet;
import java.util.*;
public class Line10 extends Applet{
public void init(){
MyCanvas1 mc=new MyCanvas1();   //画布构件
mc.setBackground(Color.gray);   //设置画布背景色
mc.setSize(300,300);
add(mc);
}
}
class MyCanvas1 extends Canvas{
public void paint(Graphics g){
 Random r=new Random();         //Random随机类
 for(int i=0;i<10;i++)          //循环画图
 {int red=r.nextInt(255);       //随机取色
  int green=r.nextInt(255);
  int blue=r.nextInt(255);
  g.setColor(new Color(red,green,blue));
  int x1=r.nextInt(300);        //随机取坐标
  int y1=r.nextInt(300);
  int x2=r.nextInt(300);
  int y2=r.nextInt(300);
  g.drawLine(x1,y1,x2,y2);}
}
}