多线程

1.继承Thread类

package xiancheng;

public class learnThread {

    //3个线程 主线程 CodingThread DownloadThread
        public static void main(String[] args) {
            long beginTime = System.currentTimeMillis();
            
            Thread cThread = new CodingThread();
            cThread.start();//调度程序
            
            Thread dThread = new DownloadThread();
            dThread.start();//调度程序
            
            long endTime = System.currentTimeMillis();
            long time = endTime - beginTime;
            System.out.println("程序共执行了"+time);
        }

}
class CodingThread extends Thread{
    public void run() {
        long beginTime = System.currentTimeMillis();
        for(int i=1; i<=100; i++) {
            try {
                Thread.sleep(10);
                System.out.println("正在写第"+ i+"行代码");
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        long endTime = System.currentTimeMillis();
        long time = endTime - beginTime;
        System.out.println("CodingThread程序共执行了"+time);
    }
    
}

class DownloadThread extends Thread{
    public void run() {
        long beginTime = System.currentTimeMillis();
        for(int i=1; i<=100; i++) {
            try {
                Thread.sleep(10);
                System.out.println("正在下载第"+ i+"集电视剧");
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        long endTime = System.currentTimeMillis();
        long time = endTime - beginTime;
        System.out.println("DownloadThread程序共执行了"+time);
    }
}

2.实现Runnable接口的类的实例

package xiancheng;

public class LearnRunnable {

    public static void main(String[] args) {
        
        Thread cThread = new Thread(new CodinThread());
        cThread.start();//调度程序
        
        Thread dThread = new Thread(new DownloaThread());
        dThread.start();//调度程序
    }

}
class CodinThread implements Runnable{
    public void run() {
        long beginTime = System.currentTimeMillis();
        for(int i=1; i<=100; i++) {
            try {
                Thread.sleep(10);
                System.out.println("正在写第"+ i+"行代码");
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        long endTime = System.currentTimeMillis();
        long time = endTime - beginTime;
        System.out.println("CodingThread程序共执行了"+time);
        }

}

class DownloaThread implements Runnable{
    public void run() {
        long beginTime = System.currentTimeMillis();
        for(int i=1; i<=100; i++) {
            try {
                Thread.sleep(10);
                System.out.println("正在下载第"+ i+"集电视剧");
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        long endTime = System.currentTimeMillis();
        long time = endTime - beginTime;
        System.out.println("DownloadThread程序共执行了"+time);
    }
}

3. Callable

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sychronized(this)方法/（object）
cThread.setDeamon(true);守护线程
cThread.join()
wait()/notify
死锁：连个线程同时争夺两个资源，各自获得一个资源，等待另一个
解决：保证拿资源的顺序是相同的

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有英文基础的同学建议直接学习
Oracle的官方文档：

http://docs.oracle.com/javase/tutorial/essential/concurrency/

多线程的相关问题，大家参考下面的链接：

http://blog.jobbole.com/76308/