Example of IllegalMonitorStateException present in java.lang package.

IllegalMonitorStateExceptionDemo.java

package com.javamultiplex.java.lang.exceptions;

/**
 * @author Rohit Agarwal
 * @version 1.0
 * @category java.lang/Exception
 * @since JDK 1.0
 */
class MyThreadNew implements Runnable {

	@Override
	public void run() {

		display();

	}

	private void display() {
		try {
			/*
			 * IllegalMonitorStateException will be thrown because without
			 * owning object's monitor we are calling wait method.
			 */
			wait(1000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}

}

public class IllegalMonitorStateExceptionDemo {

	public static void main(String[] args) {
		MyThreadNew thread = new MyThreadNew();
		Thread th = new Thread(thread);
		th.start();
	}

}