Java realizes communication between threads through wait of and notifyAll of methods

This article is an example of Java to share the implementation of thread communication between the specific code for your reference, the specific content is as follows

Java code (using two inner classes) :

package Threads;

import java.util.LinkedList;

/**
 * Created by Frank
 */
public class ProdCons {
 protected LinkedList<Object> list = new LinkedList<>();
 protected int max;
 protected boolean done = false;

 public static void main(String[] args) throws InterruptedException {
  ProdCons prodCons = new ProdCons(100, 3, 4);
  Thread.sleep(5 * 1000);
  synchronized (prodCons.list) {
   prodCons.done = true;
   try {
    prodCons.notifyAll();
   } catch (Exception ex) {
   }
  }
 }

 private ProdCons(int maxThreads, int nP, int nC) {
  this.max = maxThreads;
  for (int i = 0; i < nP; i++) {
   new Producer().start();
  }
  for (int i = 0; i < nC; i++) {
   new Consumer().start();
  }
 }

 class Producer extends Thread {
  public void run() {
   while (true) {
    Object justProduced = null;
    try {
     justProduced = getObj();
    } catch (InterruptedException e) {
     e.printStackTrace();
    }
    synchronized (list) {
     while (list.size() == max) {
      try {
       list.wait();
      } catch (InterruptedException e) {
       System.out.println("Producer INTERRUPTED");
      }
     }
     list.addFirst(justProduced);
     list.notifyAll();
     System.out.println("Produced 1;List size now " + list.size());
     if (done) {
      break;
     }
    }
   }
  }
 }

 class Consumer extends Thread {
  public void run() {
   while (true) {
    Object object = null;
    synchronized (list) {
     if (list.size() == 0) {
      try {
       list.wait();
      } catch (InterruptedException e) {
       System.out.println("Consumer INTERRUPTED");
      }
     }
     if (list.size() > 0) {
      object = list.removeLast();
     }
     list.notifyAll();
     System.out.println("List size now " + list.size());
     if (done) {
      break;
     }
    }
    if (null != object) {
     System.out.println("Consuming object " + object);
    }
   }
  }
 }

 private Object getObj() throws InterruptedException {
  Thread.sleep(1000);
  return new Object();
 }
}