如何用java實(shí)現(xiàn)一個(gè)計(jì)時(shí)器？

用java實(shí)現(xiàn)一個(gè)計(jì)時(shí)器的方法：

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public class TestDingShi implements Runnable

{

Thread xc;

Dao dao=new DaoImpl();

public TestDingShi()

{

xc=new Thread(this);//線程開啟

xc.start();

}

public void run()

{

while (true)

{

try

{

xc.sleep(1000);//睡眠開始計(jì)時(shí)

}

catch (InterruptedException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

//TODO定時(shí)在此

}

}

}

用JAVA編寫計(jì)時(shí)器

計(jì)時(shí)器可以使用timer類也可以使用線程類來操作，下面是Thread做的簡單的計(jì)時(shí)器

public?class?Calculagraph?extends?Thread?{

public?static?void?main(String[]?args)?{

new?Calculagraph().start();

}

private?long?now?=?0l;

private?long?start?=?System.currentTimeMillis();//?程序啟動(dòng)時(shí)間的毫秒值

private?long?time;

public?void?run()?{

while?(true)?{

now?=?System.currentTimeMillis();//?獲取一秒之后的毫秒值

time?=?now?-?start;//?兩個(gè)時(shí)間相減的到毫秒差

System.out.format("%02d:%02d:%02d\n",

time?/?(1000?*?60?*?60)?%?60/*?時(shí)?*/,?

time?/?(1000?*?60)%?60/*?分?*/,?

time?/?1000?%?60/*?秒?*/);//?格式化字符串輸出

try?{

Thread.sleep(1000);

}?catch?(InterruptedException?e)?{

e.printStackTrace();

}

}

}

}

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怎么給方法計(jì)時(shí)？

你可以在開始和結(jié)束的時(shí)候，分別記錄下當(dāng)前的時(shí)間的這毫秒數(shù)。然后再減，以下是一段代碼。

public class Test{

public static void main(String[] args) {

long startMili=System.currentTimeMillis();// 當(dāng)前時(shí)間對(duì)應(yīng)的毫秒數(shù)

System.out.println("開始 "+startMili);

// 執(zhí)行一段代碼,求一百萬次隨機(jī)值

for(int i=0;i1000000;i++){

Math.random();

}

long endMili=System.currentTimeMillis();

System.out.println("結(jié)束 s"+endMili);

System.out.println("總耗時(shí)為："+(endMili-startMili)+"毫秒");

}

}

新聞名稱：java代碼運(yùn)行計(jì)時(shí) java程序計(jì)時(shí)
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