倒计时程序的问题
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class countdown
{
JFrame frm;
JPanel p;
JTextField txthour,txtmin,txtsec;
JButton btnOK;
public countdown()
{
frm= new JFrame("倒计时");
p = new JPanel();
btnOK = new JButton("开始");
Mylst my = new Mylst();
btnOK.addActionListener(my);
txthour = new JTextField(3);
txtmin = new JTextField(3);
txtsec = new JTextField(3);
p.add(txthour);
p.add(txtmin);
p.add(txtsec);
p.add(btnOK);
frm.getContentPane().add(p);
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frm.setSize(300,300);
frm.setVisible(true);
}
public static void main(String agrs[])
{
new countdown();
}
class Mylst implements ActionListener
{
public void actionPerformed(ActionEvent evt)
{
oneth one = new oneth();
one.start();
}
}
class oneth extends Thread
{
public void run()
{
String sec = txtsec.getText();
int se=Integer.parseInt(sec);
String min=txtmin.getText();
int mi=Integer.parseInt(min);
String hor = txthour.getText();
int hr = Integer.parseInt(hor);
int secleft = 59 - se;
int minleft = 59 - mi;
int hourleft = 23 - hr;
if(secleft<0)
{
secleft = 60+ secleft;
minleft = minleft -1;
}
if(minleft<0)
{
minleft = 60 + minleft;
hourleft = hourleft - 1;
}
if(hourleft<0)
{
return;
}
try
{
sleep(1000);
}
catch(InterruptedException e)
{
System.out.println("错误");
}
}
}
}
本人刚刚接触java,遇到好多不懂的问题!!
最近学拉线程,我编拉一个倒计时的程序,可是
输入秒,分,时,后不会执行~!请问,我这个程序存在什么问题