动态展示按钮 没有运行出效果来
package com.lsw.server;
import java.applet.Applet;
import java.awt.Button;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class HelloApplet extends Applet implements Runnable{
private int fontSize = 8;
private Thread changer;
private boolean stopFlag = true;
private Button contrlButton = new Button(" 开始动态显示!");
public void init(){
ActionListener actionListener = new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
if(stopFlag)
start();
else
stop();
}
};
contrlButton.addActionListener(actionListener);
setBackground(Color.WHITE);
add(contrlButton);
setSize(100,100);
}
public void start(){
changer = new Thread(this);
stopFlag = false;
fontSize = 8;
contrlButton.setLabel("停止动态显示");
changer.start();
}
public void paint(Graphics g){
super.paint(g);
g.setFont(new Font("newFont",Font.BOLD,fontSize));
g.drawString("Hello", 30, 80);
}
public void stop(){
stopFlag = true;
contrlButton.setLabel("开始动态显示!");
}
@Override
public void run() {
while(!stopFlag){
repaint();
try{
Thread.sleep(1000);
}
catch(InterruptedException e){
e.printStackTrace();
}
if(fontSize++>40)
fontSize = 8;
}
}
}