谈谈java中的线程(初级概念)

标签：操作系统   多线程   java   

定义

我们自己定义的线程

来我们看第一个例子 顺便讲讲start与run的区别

public class TestThread1 {
	public static void main(String args[]) {
		Runner1 r = new Runner1();
		r.start();
	        //r.run();
		for(int i=0; i<100; i++) {
			System.out.println("Main Thread:------" + i);
		}
	}
}

class Runner1 extends Thread {
	public void run() {
		for(int i=0; i<100; i++) {	
			System.out.println("Runner1 :" + i);
		}
	}
}

这时候 就运行了两个线程 一个主线程 一个r线程
如果把r.start改成r.run那么就是先打出100个Runner1..然后才是100个Main Thread
为什么?
大家仔细看看如果我们调用r.run() 那不就是函数调用了么!!!
所以一句话我们自定义的线程必须实现run方法 但调用的时候得是start()!


再看另一种定义线程的方式

public class TestThread1 {
	public static void main(String args[]) {
		Runner1 r = new Runner1();
		Thread t = new Thread(r);
		t.start();
		
		for(int i=0; i<50; i++) {
			System.out.println("Main Thread:------" + i);
		}
	}
}


class Runner1 implements Runnable {
	public void run() {
		for(int i=0; i<50; i++) {	
			System.out.println("Runner1 :" + i);
		}
	}
}

 sleep interrupt stop flag

public class TestThread3{
	public static void main(String args[]) {
		Runner3 r = new Runner3();
		Thread t = new Thread(r);
		t.start();
	}
}


class Runner3 implements Runnable {
	public void run() {
		for(int i=0; i<30; i++) {	
			if(i%10==0 && i!=0) {
				try{
					Thread.sleep(2000); 
				}catch(InterruptedException e){}
			}
			System.out.println("No. " + i);
		}
	}
}

public class TestInterrupt {
  public static void main(String[] args) {
    MyThread thread = new MyThread();
    thread.start();
    try {Thread.sleep(10000);}
    catch (InterruptedException e) {}
    thread.interrupt();


  }
}


class MyThread extends Thread {
	boolean flag = true;
  public void run(){
    while(true){
      System.out.println("==="+new Date()+"===");
      try {
        sleep(1000);
      } catch (InterruptedException e) {
       return;
      }
    }
  }
}

join yield priority

public class TestInterrupt {
  public static void main(String[] args) {
    MyThread thread = new MyThread();
    thread.start();
    try {Thread.sleep(10000);}
    catch (InterruptedException e) {}
    thread.interrupt();


  }
}


class MyThread extends Thread {
	boolean flag = true;
  public void run(){
    while(true){
      System.out.println("==="+new Date()+"===");
      try {
        sleep(1000);
      } catch (InterruptedException e) {
       return;
      }
    }
  }
}

public class TestInterrupt {
  public static void main(String[] args) {
    MyThread thread = new MyThread();
    thread.start();
    try {Thread.sleep(10000);}
    catch (InterruptedException e) {}
    thread.interrupt();


  }
}


class MyThread extends Thread {
	boolean flag = true;
  public void run(){
    while(true){
      System.out.println("==="+new Date()+"===");
      try {
        sleep(1000);
      } catch (InterruptedException e) {
       return;
      }
    }
  }
}

public class TestPriority {
	public static void main(String[] args) {
		Thread t1 = new Thread(new T1());
		Thread t2 = new Thread(new T2());
		t1.setPriority(Thread.NORM_PRIORITY + 3);
		t1.start();
		t2.start();
	}
}


class T1 implements Runnable {
	public void run() {
		for(int i=0; i<1000; i++) 
			System.out.println("T1: " + i);
		
	}
}


class T2 implements Runnable {
	public void run() {
		for(int i=0; i<1000; i++) 
			System.out.println("------T2: " + i);
		
	}
}

谈谈java中的线程(初级概念)

标签：操作系统   多线程   java   

原文地址：http://blog.csdn.net/dlf123321/article/details/40110713