Java线程总结（一）

首先，先贴上一个简单的线程实例：

public class MyThread  extends Thread{
@Override
public void run(){
try {
for (int i = 0; i < 10; i++){
int time = 1000;
Thread.sleep(time);
System.out.println("run = "  + Thread.currentThread().getName());
}
}catch (InterruptedException e){
e.printStackTrace();
}
}

public static void main(String[] args) {
MyThread myThread = new MyThread();
myThread.setName("MyThread");
myThread.start();
try{
for (int i = 0; i < 10; i++){
int time = 1000;
Thread.sleep(time);
System.out.println("main = " + Thread.currentThread().getName());
}
}catch (InterruptedException e){
e.printStackTrace();
}
}
}

运行结果如下：



由运行结果可以看出，程序中有两个线程，一个是主线程，另一个是我手动创建的线程，主线程都是jvm创建的。

线程执行start()方法不代表线程的启动顺序，如下例：

public class MyThread  extends Thread{

private int i;

public MyThread(int i){
super();
this.i = i;
}

@Override
public void run(){
System.out.println(i);
}

public static void main(String[] args) {
MyThread thread1 = new MyThread(1);
MyThread thread2 = new MyThread(2);
MyThread thread3 = new MyThread(3);
MyThread thread4 = new MyThread(4);
MyThread thread5 = new MyThread(5);
MyThread thread6 = new MyThread(6);
MyThread thread7 = new MyThread(7);
MyThread thread8 = new MyThread(8);
MyThread thread9 = new MyThread(9);
MyThread thread10 = new MyThread(10);
thread1.start();
thread2.start();
thread3.start();
thread4.start();
thread5.start();
thread6.start();
thread7.start();
thread8.start();
thread9.start();
thread10.start();
}
}

运行结果如下，执行顺序与调用start()方法的顺序不一致：