Wait and Notify

package soccer.play;
public class Process {
	private List<Integer> list=new ArrayList<>();
	private static final int LOWER_LIMIT=0;
	private static final int UPPER_LIMIT=5;
	private static final Object lock=new Object();
	private int value=0;
	public void producer() throws InterruptedException{
		
		synchronized(lock){
			
			while(true) {
				if(list.size()==UPPER_LIMIT) {
					System.out.println("Waiting for removing items");
					lock.wait();
				}else {
					System.out.println("Adding: "+value);
					list.add(value++);
					lock.notify();
				}
				Thread.sleep(500);
			}
			
		}
		
	}
	
	public void consumer() throws InterruptedException{
		synchronized(lock){
			while(true) {
				if(list.size()==LOWER_LIMIT) {
					value=0;
					System.out.println("Waiting for Adding items");
					lock.wait();
				}else {
					System.out.println("Removing: "+list.remove(list.size()-1));
					lock.notify();			
				}
				Thread.sleep(500);
			}
			
		}
	}
	
}

public class League {

	public static void main(String[] args) {
		Process process=new Process();
		
		Thread t1=new Thread(new Runnable() {
			@Override
			public void run() {
				try {
					process.producer();
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		});
		
		Thread t2=new Thread(new Runnable() {
			@Override
			public void run() {
				try {
					process.consumer();
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		});
		
		t1.start();
		t2.start();
	}
			
	}