定时器

package swing;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;


public class BANG{
    public  static volatile int T2;
    public static int time;
    public JFrame jFrame;
    public static int i,j,x,y;
    public Button button=new Button("begin");
    public Button button2=new Button("stop");
    public static TextField textField=new TextField("60",8);

    public BANG(String name){
        i=0;
        j=0;
        x=50;
        y=120;
        jFrame=new JFrame();
        jFrame.setName(name);
        jFrame.setTitle("BANG!!!");
        jFrame.setSize(x,y);
        jFrame.setLayout(new FlowLayout());
        jFrame.add(new Label("time is:"));
        jFrame.add(textField);
        jFrame.add(new Label("unit:s"));
        jFrame.add(button);
        jFrame.add(button2);
        jFrame.setVisible(true);
    }

    public void run(){
        {
            Thread1 T=new Thread1();
            T.start();
            button2.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    Thread1.stop=true;
                }
            });
        }
    }

    public static void main(String[] args) {
        BANG bang=new BANG("BANG!");

        bang.jFrame.addWindowListener(new WindowListener(){

            @Override
            public void windowOpened(WindowEvent e) {

            }

            @Override
            public void windowClosing(WindowEvent e) {
                Thread1.stop=true;
                System.exit(0);
            }

            @Override
            public void windowClosed(WindowEvent e) {
            }

            @Override
            public void windowIconified(WindowEvent e) {

            }

            @Override
            public void windowDeiconified(WindowEvent e) {

            }

            @Override
            public void windowActivated(WindowEvent e) {

            }

            @Override
            public void windowDeactivated(WindowEvent e) {

            }
        });

        bang.button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String tim=bang.textField.getText();
                try {
                    time = Integer.parseInt(tim);
                }catch (Exception e1){
                    System.out.println("异常出来");
                    time=T2;
                }
                finally {
                    Thread1.stop=false;
                    System.out.println(time);
                    bang.run();
                }
            }
        });

    }

}

package swing;

import javax.swing.*;
import java.awt.*;

public class Thread1 extends Thread{
    public  static volatile boolean stop = false;
    public void run(){
        while(BANG.time>0 && !stop){
            System.out.println("时间：" BANG.time);
            BANG.time--;
            BANG.textField.setText(BANG.time "s");
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        if(BANG.time==0 && stop==false){
            begin();
        }
        else {
            BANG.T2=BANG.time;
            BANG.textField.setText("stop");
            System.out.println("退出");

        }
    }


    public void begin(){
        while(true){
            JFrame jFrame1=new JFrame("dead    Dead!!!!");
            jFrame1.setSize(50,60);
            BANG.i=BANG.i 10;
            BANG.j=BANG.j 10;
            jFrame1.setLocation(BANG.i,BANG.j);
            jFrame1.add(new Label("BANG   BANG!!"));
            jFrame1.setVisible(true);
        }
    }
}

来源：https://www./content-4-285051.html