Differences between wait() and join() methods in Java

In multithreading when we deal with threads there comes the requirement of pause and start a thread for this Threading provides two methods wait and join which are used for the same.

The following are the important differences between wait() and join().

Example of wait() vs join()

JavaTester.java

 Live Demo

public class JavaTester extends Thread {
   static Object lock = new Object();
   static int n;
   int i;
   String name;
   JavaTester(String name, int i) {
      this.name = name;
      this.i = i;
   }
   @Override
   public void run() {
      try {
         synchronized (lock) {
            while (i != n) {
               lock.wait();
            }
            System.out.println(name + " started");
            n++;
            lock.notifyAll();
         }
         synchronized (lock) {
            while (i != n - 4) {
               lock.wait();
            }
            System.out.println(name + " finished");
            n++;
            lock.notifyAll();
         }
      }
      catch (InterruptedException e) {
      }
   }
   public static void main(String[] args) throws Exception {
      new JavaTester("a", 0).start();
      new JavaTester("b", 1).start();
      new JavaTester("c", 2).start();
      new JavaTester("d", 3).start();
   }
}

Output

a started
b started
c started
d started
a finished
b finished
c finished
d finished