Java多线程深入理解学习笔记之七-----线程间的通信及等待唤醒机制

线程间的通信

针对同一个资源的操作有不同种类的线程

•举例：卖票有进的，也有出的。

 代码如下:

(消费者)

package 线程间通信;

public class GetThread implements Runnable{
	Student student = null;
	
	@Override
	public void run() {
		// TODO Auto-generated method stub
		while(true) {		
			synchronized (student) {
//				if(!student.isHave) {
//					try {
//						student.wait();
//					} catch (InterruptedException e) {
//						// TODO Auto-generated catch block
//						e.printStackTrace();
//					}
//				}else {
					System.out.println(student.name+" "+student.age);
//					student.isHave = false;
//					student.notify();
				}
			}	
		}		
//	}
	
	public GetThread() {
		
	}
	
	public GetThread(Student student) {
		this.student = student;
	}
	
}

(生产者)

package 线程间通信;

public class SetThread implements Runnable{
	Student student = null;
	private int n = 0;
	@Override
	public void run() {
		// TODO Auto-generated method stub
		
		while(true) {	
			synchronized (student) {
//				if(student.isHave) {
//					try {
//						student.wait();
//					} catch (InterruptedException e) {
//						// TODO Auto-generated catch block
//						e.printStackTrace();
//					}
//				}
				if(n%2==0) {
					student.name = "帅气的我";
					student.age = 18;
				}else {
					student.name = "我超级帅的哦";
					student.age = 20;
				}
				n++;
//				student.isHave = true;
//				student.notify();
			}
		}
	}
	
	public SetThread() {
		
	}
	
	public SetThread(Student student) {
		this.student = student;
	}
	
}

(产品类)

package 线程间通信;

public class Student {
	public int age;
	public  String name;
	public boolean isHave = false;
}

测试类:

package 线程间通信;

public class Demo {
	public static void main(String[] args) {
		Student student = new Student();
		
		SetThread setThread = new SetThread(student);
		GetThread getThread = new GetThread(student);
		
		Thread thread = new Thread(setThread, "A");
		Thread thread2 = new Thread(getThread, "B");
		
		thread.start();
		thread2.start();
	}
}

运行结果:

这样的结果虽然已经符合线程之间的同步问题,但是却不是我们想要的效果,因为消费者是要等生产者生产完了才可以消费的,而生产者要消费者消费完了才可以生产的,这样才符合逻辑,那么该怎么办呢?这时候就需要线程间的等待唤醒机制来进行解决！

具体代码如上去掉注释,运行结果如下:

这样才符合逻辑啊~~~~