java Thread编程（一）如何创建线程

1，以继承Runnable接口的形式创建新的线程。 

package test;

public class HelloWorldRunnable implements Runnable{

public static void main(String[] args) {

HelloWorldRunnable helloWorld1 = new HelloWorldRunnable();
HelloWorldRunnable helloWorld2 = new HelloWorldRunnable();
HelloWorldRunnable helloWorld3 = new HelloWorldRunnable();
Thread thread1 = new Thread(helloWorld1);
Thread thread2 = new Thread(helloWorld2);
Thread thread3 = new Thread(helloWorld2);

thread1.start();
System.out.println("============thread1====================");
System.out.println("ID: "+thread1.getId());
System.out.println("Name: "+thread1.getName());

thread2.start();
System.out.println("============thread2====================");
System.out.println("ID: "+thread2.getId());
System.out.println("Name: "+thread2.getName());

thread3.start();
System.out.println("============thread3====================");
System.out.println("ID: "+thread3.getId());
System.out.println("Name: "+thread3.getName());

}

@Override
public void run() {

System.out.println("hello world!");
}

}

输出为：

============thread1====================

ID: 8

Name: Thread-0

hello world!

============thread2====================

ID: 9

Name: Thread-1

============thread3====================

ID: 10

Name: Thread-2

hello world!

hello world!

稍微注意一下就会发现每次执行的结果都可能不同！

2，以继承Thread类的方式创建新的线程。

package test;

public class HelloWorldThread extends Thread{

public static void main(String[] args) {

HelloWorldThread thread1 = new HelloWorldThread();
HelloWorldThread thread2 = new HelloWorldThread();
HelloWorldThread thread3 = new HelloWorldThread();

thread1.start();
System.out.println("============thread1====================");
System.out.println("ID: "+thread1.getId());
System.out.println("Name: "+thread1.getName());

thread2.start();
System.out.println("============thread2====================");
System.out.println("ID: "+thread2.getId());
System.out.println("Name: "+thread2.getName());

thread3.start();
System.out.println("============thread3====================");
System.out.println("ID: "+thread3.getId());
System.out.println("Name: "+thread3.getName());
}

@Override
public void run() {

System.out.println("hello world!");
}

}

输出的结果为：

============thread1====================

hello world!

ID: 8

Name: Thread-0

============thread2====================

ID: 9

Name: Thread-1

hello world!

============thread3====================

hello world!

ID: 10

Name: Thread-2