强大的多线程和倒计时程序 (一)

多线程技术是非常实用的技术，特别是碰到有关运行多个任务的程序，就只有多线程才能满足你的要求。在以下程序中我所展示的是一个倒计时程序及利用Callable接口（不是Runnable接口）来返回一个你所要求的值，关于这方面的知识，你要多看一下API文档中的线程池类executor和callable接口。如果读者感兴趣的话以下的代码一定要认真的看，特别是我标了注释的地方，相信读者一定会有收获的，还可以把下面的代码复制下来自己去运行一下看一下结果，如果不懂的地方可以发到我的邮箱。本人很荣幸为您解答，只要我力所能及的事我一定会去帮助您！
package rick_demo;

import java.awt.*;
import java.awt.event.*;
import java.util.Calendar;
import java.util.concurrent.Callable;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.ArrayList;

import javax.swing.*;

public class Test extends JFrame {


private static final long serialVersionUID = 9195701874098282860L;

private String[] str=new String[10];
String bin = new String();
JTextField jf;
JTextArea ja;
JScrollPane jp;
JButton jButton1;
private static short coin=0;
JButton jButton2;

Calendar now;

int hour;

int hourEnd;

int minute;

int minutend;

int second;

int secondend;

int hourend;

int minutePlus;

int secondPlus;

Thread t;

boolean right = true;

public Test() {
setSize(300, 200);
jf = new JTextField(25);
ja = new JTextArea(20,30);
//ja.append("hello\n"+"world");
jp =new JScrollPane(ja);
jp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
jp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);

for(int i=0;i<10;i++)
str[i] = new String();

jf.setText("单击按纽进行相应的操作");

jButton1 = new JButton("显示时间剩余时间");
jButton2 = new JButton("暂停");
Container container = getContentPane();
container.setLayout(new FlowLayout());
container.add(jf );
container.add(jButton1);
container.add(jButton2);
container.add(jp);
//获取系统刚开始运行的初始值
now = Calendar.getInstance();
hourEnd = now.get(Calendar.HOUR_OF_DAY) + 1 ;
minutePlus = now.get(Calendar.MINUTE);
secondPlus = now.get(Calendar.SECOND);
t = new Thread(new Runnable() {

public void run() {
while (true) {
while (right) {
try {

Thread.sleep(60);

jf.setText(CalTime());
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
});

t.start();

jButton1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {

right = true;
}
});

jButton2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent g) {
right = false;
}
});
setVisible(true);
}

public String CalTime() {
now = Calendar.getInstance();
hour = now.get(Calendar.HOUR_OF_DAY);
minute = now.get(Calendar.MINUTE);
second = now.get(Calendar.SECOND);
if (hourEnd >= hour) {
hourend = hourEnd - hour;
secondend = 59 - second+secondPlus;

minutend = 59 - minute+minutePlus;
}
return "2小时倒计时hour: " + hourend + " minute: " + minutend
+ " second: " + secondend;
}
public String[] work(){ //多线程关键代码

ExecutorService exec= Executors.newCachedThreadPool();
ArrayList> results= new ArrayList>();
for(int i=0;i<10;i++)
results.add(exec.submit(new TaskT(i)));
for(Future fuck : results)
try{
bin = fuck.get() ;
str[coin] = bin;
coin++;
} catch(InterruptedException e){
System.exit(1);
} catch(ExecutionException e){
}