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Java并发编程初级篇(一)：线程实现与运行的两种方式

2016-11-21 00:00 316 查看
摘要: Java中可以通过两种方式来实现线程，看似一样的效果，他们之间又有什么区别呢？

通过继承Thread类来实现一个线程

线程的创建：

public class MyThread extends Thread {
private int num = 5;

@Override
public void run() {
while (num > 0) {
System.out.println("Thread:" + Thread.currentThread().getName() + ", consume " + num);
num--;
try {
sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}


线程的运行：

public static void main(String[] args) {
MyThread thread1 = new MyThread();
MyThread thread2 = new MyThread();
MyThread thread3 = new MyThread();

thread1.start();
thread2.start();
thread3.start();
}


运行结果：

Thread:Thread-0, consume 5
Thread:Thread-1, consume 5
Thread:Thread-2, consume 5
Thread:Thread-0, consume 4
Thread:Thread-2, consume 4
Thread:Thread-1, consume 4
Thread:Thread-0, consume 3
Thread:Thread-1, consume 3
Thread:Thread-2, consume 3
Thread:Thread-0, consume 2
Thread:Thread-2, consume 2
Thread:Thread-1, consume 2
Thread:Thread-0, consume 1
Thread:Thread-2, consume 1
Thread:Thread-1, consume 1


通过实现Runnable接口来实现一个线程

线程的创建：

public class MyRunnable implements Runnable {
private int num = 5;

@Override
public void run() {
while (num > 0) {
System.out.println("Thread:" + Thread.currentThread().getName() + ", consume " + num);
num--;
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}


第一种运行方式：

public static void main(String[] args) {
Thread thread1 = new Thread(new MyRunnable());
Thread thread2 = new Thread(new MyRunnable());
Thread thread3 = new Thread(new MyRunnable());

thread1.start();
thread2.start();
thread3.start();
}


第一种方式运行结果：

Thread:Thread-0, consume 5
Thread:Thread-2, consume 5
Thread:Thread-1, consume 5
Thread:Thread-0, consume 4
Thread:Thread-2, consume 4
Thread:Thread-1, consume 4
Thread:Thread-2, consume 3
Thread:Thread-1, consume 3
Thread:Thread-0, consume 3
Thread:Thread-1, consume 2
Thread:Thread-0, consume 2
Thread:Thread-2, consume 2
Thread:Thread-1, consume 1
Thread:Thread-2, consume 1
Thread:Thread-0, consume 1


第二种运行方式：

public static void main(String[] args) {
Runnable runnable = new MyRunnable();

Thread thread1 = new Thread(runnable);
Thread thread2 = new Thread(runnable);
Thread thread3 = new Thread(runnable);

thread1.start();
thread2.start();
thread3.start();
}


第二种方式运行结果：

Thread:Thread-0, consume 5
Thread:Thread-1, consume 4
Thread:Thread-2, consume 3
Thread:Thread-0, consume 2
Thread:Thread-1, consume 1


总结：

通过继承Thread类和实现Runnable接口都能够实现一个线程，但是实现Runnable接口创建的线程类可以交给多个Thread来运行。这类似于需要加工30个零件，第一种方式为交给三个人去做每个人加工10个零件，完成时间取决于最慢的哪个人；第二种方式为一共30个零件交给3个人去加工，速度快的人会为速度慢的人分担加工的零件，总体速度会提升。
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标签：  Java 多线程 并发 Thread Runnable
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