Java互斥

    当两个线程代码中存在临界段时，指的是有一段访问系统临界资源的代码，你不能保证线程A中的临界段的代码全部被执行完后才会执行线程B. 这时，若希望互斥，让先进去临界资源的临界段会阻止后面进入临界段的执行，用java提供的synchronized关键字。

public class Test {

	public static void main(String[] args) {
		Thread t1 = new Thread(new MyThread());
		Thread t2 = new Thread(new Mythread2());
		t1.start();
		t2.start();

	}

}

class MyThread implements Runnable {

	public void run() {
		for (int i = 0; i < 100; i++)
			System.out.println("线程1");
	}

}

class Mythread2 implements Runnable {

	public void run() {
		for(int i = 0 ; i < 100; i++)
			System.out.println("线程2");

	}
}

 

public class Test {

	public static void main(String[] args) {
		Thread t1 = new Thread(new MyThread());
		Thread t2 = new Thread(new Mythread2());
		t1.start();
		t2.start();

	}

}

class MyThread implements Runnable {

	public synchronized void run() {
		for (int i = 0; i < 100; i++)
			System.out.println("线程1");
	}

}

class Mythread2 implements Runnable {

	public synchronized void run() {
		for(int i = 0 ; i < 100; i++)
			System.out.println("线程2");

	}
}