我想用线程在applet上随机画矩形,但不能画,代码如下:
import java.awt.*;
import javax.swing.*;
import java.applet.*;
import java.math.*;
public class PaintRects extends Applet implements Runnable {
public void init(){
this.run();
}
public void paint(Graphics g){ }
public void update(Graphics g){
Color c=new Color(Math.round(255*Math.random()),Math.round(255*Math.random()),Math.round(255*Math.random()));
g.setColor(c);
int demision=(int)(1000*Math.random());
g.fillRect(demision,demision,demision,demision); }
public void run(){
while(true){ this.repaint();
try{Thread.sleep(1000);}
catch(Exception e){
System.out.println("出错!");
} }
}
}
希望各位有心人,帮帮忙!
import java.awt.*;
import javax.swing.*;
import java.applet.*;
import java.math.*;
public class PaintRects extends Applet implements Runnable {
public void init(){
this.run();
}
public void paint(Graphics g){ }
public void update(Graphics g){
Color c=new Color(Math.round(255*Math.random()),Math.round(255*Math.random()),Math.round(255*Math.random()));
g.setColor(c);
int demision=(int)(1000*Math.random());
g.fillRect(demision,demision,demision,demision); }
public void run(){
while(true){ this.repaint();
try{Thread.sleep(1000);}
catch(Exception e){
System.out.println("出错!");
} }
}
}
希望各位有心人,帮帮忙!
import java.awt.*;
import javax.swing.*;
import java.applet.*;
import java.math.*;
public class PaintRects extends Applet implements Runnable { Thread t; //须新建Thread并引用启动一个线程
public void init(){
t=new Thread(this);
t.start() ; }
public void paint(Graphics g){ }
public void update(Graphics g){
int cr=(int)(255*Math.random());
int cg=(int)(255*Math.random());
int cb=(int)(255*Math.random());
Color c=new Color(cr,cg,cb);
g.clearRect(0,0,getSize().width,getSize().height );
g.setColor(c);
int x=(int)(getSize().width *Math.random());
int y=(int)(getSize().height *Math.random());
int demision1=(int)(getSize().width *Math.random());
int demision2=(int)(getSize().height *Math.random());
g.fillRect(x,y,demision1,demision2); }
public synchronized void run(){ while(true){
repaint();
try{Thread.sleep(100);}
catch(Exception e){
System.out.println("出错!");
} }
}
}
这样便可以看见色彩缤纷的四方形了
楼上的代码比较另类