java定义了创建线程的两种方法
1.实现Runnable接口
2.扩展Thread类本身
1.实现Runnable接口:
可以依托任何Runnable接口的对象来创建线程。但是为了实现Runnable接口,类需要实现run()方法。
创建了实现Runnable接口的类之后,可以在类中实例化Thread类型的对象。Thread类定义了几个构造函数,下面实例中使用的构造函数如下:
Thread(Runnable threadOb,String threadName) //该构造函数中,threadOb是实现了Runnable接口的类的实例或对象;
实例:
实现Runnable接口的类NewThread代码:
public class NewThread implements Runnable{ Thread t; public NewThread() { //this是实现Runnable接口的类的实例 t=new Thread(this,"Demo Thread"); System.out.println("Child thread:"+t); t.start(); } public void run() { try { for(int i=5;i>0;i--) System.out.println("Child thread:"+i+":"+Thread.currentThread()); Thread.sleep(500); } catch (InterruptedException e) { System.out.println("Child Interrupted."); } System.out.println("Exiting Child thread."); } }
测试类ThreadDemo代码:
public class ThreadDemo { public static void main(String[] args) { // TODO Auto-generated method stub new NewThread(); try{ for(int i=5;i>0;i--){ System.out.println("Main Thread:"+i+":"+Thread.currentThread()); Thread.sleep(1000); } }catch (InterruptedException e) { System.out.println("Main thread Interrupted."); } System.out.println("Exiting Main thread."); } }
运行结果如下图:
ps:Thread.currentThread()方法输出的是当前线程线程名称,优先级5,线程所处的线程组main。
未完待续...