java多线程学习一：实现多线程的两种方法

没有继承或实现多线程接口

public class ThreadDemo1 {
	public static void main(String[] args) {
		new TestThread().run();//main函数必须等到该方法返回才能继续执行
		while(true){
			System.out.println("main thread is running");
		}
		
	}
}

class TestThread{
	public void run(){
		while(true){
			System.out.println(Thread.currentThread().getName()+" is running");
		}
	}
}

//result

//main is running
//main is running
//main is running
//main is running
//main is running
//main is running

继承Thread

public class ThreadDemo1 {
	public static void main(String[] args) {
		new TestThread().start();//main主线程和子线程交替执行

 //该方法负责产生一个新的线程，并且调用run（）方法
		while(true){
			System.out.println("main thread is running");
		}
		
	}
}
  
class TestThread extends Thread{//继承Thread
	public void run(){
		while(true){
			System.out.println(Thread.currentThread().getName()+" is running");
		}
	}
}

//result

//Thread-0 is running
//Thread-0 is running
//Thread-0 is running
//Thread-0 is running
//main thread is running
//main thread is running
//main thread is running
//main thread is running
//main thread is running
//main thread is running

实现runnable接口

public class ThreadDemo1 {
	public static void main(String[] args) {
		TestThread tt = new TestThread();
		Thread t = new Thread(tt);
		t.start();
		while(true){
			System.out.println("main thread is running");
		}
		
	}
}

class TestThread implements Runnable{
	public void run(){
		while(true){
			System.out.println(Thread.currentThread().getName()+" is running");
		}
	}
}

//result

//Thread-0 is running
//Thread-0 is running
//main thread is running
//Thread-0 is running
//main thread is running
//Thread-0 is running
//main thread is running
//Thread-0 is running
//main thread is running
//main thread is running
//main thread is running