how can I stop a thread in producer and consumer problem in java?

package producerconsumer;

import java.util.Scanner;

public class Consumer implements Runnable {
    Thread t;
    String consumerName;

    public Consumer(String name) {
        t = new Thread(this, name);
        t.start();
        
    }
    @Override
    public  void run() {
        int m = Producer_consumer.n;
        try {
            if (m!=0) {           
                 Producer_consumer.delay.acquire();
            }
            else
            {
                Thread.sleep(100); //??   
            }
            
            while (true) {
                Producer_consumer.criticalSection.acquire();
                consumerName = Thread.currentThread().getName();
                consume();
                Producer_consumer.n--;
                Producer_consumer.form.setLable(Producer_consumer.n + "");
                m = Producer_consumer.n;
                Producer_consumer.criticalSection.release();

            }

        } catch (InterruptedException ex) {
            ex.printStackTrace();
        }

    }

    }