怎么編寫一個(gè)倒計(jì)時(shí)的java的程序？求具體步驟！

基于控制臺(tái)的話很簡(jiǎn)單的，我跟你說一下大體思路吧，二話不說先來個(gè)for循環(huán)，然后輸出倒計(jì)時(shí)的數(shù)字，程序睡一秒，在輸出倒計(jì)時(shí)數(shù)字，如此循環(huán)，簡(jiǎn)單吧，下面看程序：

臨澤ssl適用于網(wǎng)站、小程序/APP、API接口等需要進(jìn)行數(shù)據(jù)傳輸應(yīng)用場(chǎng)景，ssl證書未來市場(chǎng)廣闊！成為創(chuàng)新互聯(lián)公司的ssl證書銷售渠道，可以享受市場(chǎng)價(jià)格4-6折優(yōu)惠！如果有意向歡迎電話聯(lián)系或者加微信：13518219792（備注：SSL證書合作）期待與您的合作！

public static void main(String[] args) {

for(int i=10;i0;i--){

System.out.print(i+" ");

try {

Thread.sleep(1000);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

System.err.print("爆炸");

}

其他基于網(wǎng)頁的還是基于用戶界面都可以使用這個(gè)思路的

用java編寫一個(gè)倒計(jì)時(shí)器代碼。

import java.awt.BorderLayout;import java.awt.Container;import java.awt.Font;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JTextField;public class TimerDemo extends JFrame implements ActionListener { private static final long serialVersionUID = 201306211111L; private JTextField screen = new JTextField("0"); private JButton start = new JButton("開始"); private JButton reset = new JButton("重置"); private JPanel panel = new JPanel(); private boolean isRunning; private int time; private int timeBetween; public TimerDemo(int timeBetween) { super("計(jì)時(shí)器"); this.timeBetween = timeBetween; try { init(); } catch (Exception e) { e.printStackTrace(); } } public TimerDemo() { super("計(jì)時(shí)器"); this.timeBetween = 100; try { init(); } catch (Exception e) { e.printStackTrace(); } } private void init() { panel.setLayout(new GridLayout()); panel.add(start); panel.add(reset); start.addActionListener(this); reset.addActionListener(this); screen.setFont(new Font("幼圓", Font.BOLD, 60)); screen.setHorizontalAlignment(JTextField.CENTER); screen.setEditable(false); Container c = getContentPane(); c.setLayout(new BorderLayout()); c.add(panel, BorderLayout.SOUTH); c.add(screen, BorderLayout.CENTER); this.setSize(200, 150); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setResizable(false); this.setLocationRelativeTo(null); this.setVisible(true); } public static void main(String[] args) { new TimerDemo(1);// 設(shè)定 1ms/次 // new TimerDemo(); } @Override public void actionPerformed(ActionEvent e) { if (e.getSource() == start) { if (start.getText().equals("開始")) { start.setText("暫停"); isRunning = true; } else if (start.getText().equals("暫停")) { start.setText("開始"); isRunning = false; } } if (e.getSource() == reset) { start.setText("開始"); screen.setText("0"); isRunning = false; time = 0; } new Thread(new TimeZone()).start(); } class TimeZone implements Runnable { @Override public void run() { while (isRunning) { time++; if (time = Integer.MAX_VALUE) { screen.setText("ERROR"); JOptionPane.showMessageDialog(null, "ERROR"); isRunning = false; } screen.setText(String.valueOf(time)); try { Thread.sleep(timeBetween); } catch (Exception e) { e.printStackTrace(); } } } }}

java寫個(gè)謝謝~謝謝~謝謝~謝謝~謝謝~謝謝~謝謝~謝謝~謝謝~謝謝~謝謝~

import java.io.IOException;

public class run_QQ {

/**

* @param args

* @throws InterruptedException

* @throws IOException

*/

public static void main(String[] args) throws InterruptedException, IOException {

// TODO Auto-generated method stub

for(int i=5;i0;i--){

System.out.println("將在"+ i +"秒后啟動(dòng)QQ");

Thread.sleep(1000);

}

Process a=Runtime.getRuntime().exec("D:\\個(gè)人應(yīng)用\\QQ\\QQ.exe");

}

}

我也不太會(huì) 你看看吧 能達(dá)到你的要求一點(diǎn)點(diǎn)

Process a=Runtime.getRuntime().exec("D:\\個(gè)人應(yīng)用\\QQ\\QQ.exe");

exec("");里面改成你QQ的位置就可以了

java 倒計(jì)時(shí)的程序

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import java.util.Timer;

import java.util.TimerTask;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JTextField;

public class TimeThreadFrame extends JFrame{

// 定義組件

private JLabel lblTime;

private JTextField txtInput;

private JButton btnEnter;

// 構(gòu)造方法

public TimeThreadFrame(){

// 設(shè)置窗體的相關(guān)屬性

super("TimerThread");

this.setSize(300,200);

this.setLayout(null);

this.setLocation(100,50);

// 創(chuàng)建組件

this.lblTime = new JLabel("請(qǐng)輸入倒計(jì)時(shí)時(shí)間");

this.lblTime.setBounds(30,20,200,30);

this.txtInput = new JTextField();

this.txtInput.setBounds(30,70,100,30);

this.btnEnter = new JButton("確定");

this.btnEnter.setBounds(150,70,70,30);

// 給JTextField注冊(cè)監(jiān)聽

this.txtInput.addKeyListener(new KeyListener(){

public void keyPressed(KeyEvent ke) {

}

public void keyReleased(KeyEvent ke) {

}

public void keyTyped(KeyEvent ke) {

txtInput_KeyTyped(ke);

}

});

// 給JButton注冊(cè)監(jiān)聽

this.btnEnter.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent ae){

btnEnter_ActionPerformed(ae);

}

});

// 將各組件添加到窗體上

add(lblTime);

add(txtInput);

add(btnEnter);

// 顯示窗體

this.setVisible(true);

}

// 輸入時(shí)的事件處理，控制用戶只能輸入數(shù)字

public void txtInput_KeyTyped(KeyEvent ke){

if(ke.getKeyChar() '0' || ke.getKeyChar() '9'){

ke.setKeyChar('\0');

}

}

// 點(diǎn)擊按鈕時(shí)的事件處理，核心！

public void btnEnter_ActionPerformed(ActionEvent ae){

// 獲得用戶輸入的倒計(jì)時(shí)時(shí)間

String strTime = this.txtInput.getText();

if(strTime.equals("")){

// 檢測(cè)用戶是否輸入

this.lblTime.setText("您尚未輸入，請(qǐng)輸入！");

}

else{

Integer time = Integer.parseInt(strTime);

// 創(chuàng)建線程

TimeThread tt = new TimeThread(this.lblTime,time);

tt.start();

// 創(chuàng)建Timer

Timer timer = new Timer();

timer.schedule(new TimerTask(){

// 啟動(dòng)其他程序

public void run() {

System.out.print("ok");

}

}, time * 1000);

}

}

// 啟動(dòng)窗體

public static void main(String[] args){

new TimeThreadFrame();

}

}

// 時(shí)間線程類

class TimeThread extends Thread{

private JLabel lblTime;

private int time;

// 構(gòu)造方法傳入，顯示事件的JLabel和倒計(jì)時(shí)的時(shí)間。

public TimeThread(JLabel lblTime, int time){

this.lblTime = lblTime;

this.time = time;

}

// run方法

public void run(){

while(time 0){

// 顯示所剩時(shí)間

this.lblTime.setText("所剩時(shí)間：" + time);

// 所剩時(shí)間減少

time--;

try {

this.sleep(1000);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

}

滿意請(qǐng)采納。