Java uses lock and unlock to implement consumer and producer issues (multithreading)

import java.util.concurrent.locks.condition;import java.util.concurrent.locks.lock;import  java.util.concurrent.locks.reentrantlock;public class lockandunlockdemo {     public static void main (String[] args)  {       &NBSP;&NBSP;CLERK2&NBSP;C=NEW&NBSP;CLERK2 ();         thread t=new  thread (New producer2 (c));        thread t1=new  Thread (New consumer2 (c));         t.start ();         t1.start ();    }}class clerk2{     Number of producers produced by private int product=0;//to shop assistants     private Lock lock =  New reentrantlock ();    private condition condition_pro =  Lock.newcondition ();    private condition condition_con = lock.newcondition ();         public void addproduct () {        lock.lock ();        try {             if (this.product>5) {                 try {                     condition_con.await ();                 } catch  ( Interruptedexception e)  {                                           e.printstacktrace ();                 }            }else{                 product++;                 system.out.println (" Production of the "+product+" product ");                 condition_con.signal ();             }         }finally {             lock.unlock ();        }     }    public void getproduct () {         lock.lock ();         try {             if (this.product<=0) {                 try {                     condition_con.await ();                 } catch  (interruptedexception e)  {                      e.printstacktrace ();                 }            }             else{             &nbsp   system.out.println ("The consumer buys the first" +product+ "commodity");                 product--;                 condition_pro.signal ();             }        } finally  {            lock.unlock ();         }            } }class producer2 implements runnable{    private clerk2 clerk;         public producer2 (Clerk2 clerk)  {         super ();         this.clerk =  clerk;    }&nBsp;   public void run ()  {         System.out.println ("Start of goods production");         while (True) {             try {                 thread.sleep ((int) (Math.random () *10) *1000);             } catch  (Interruptedexception e)  {                //  TODO Auto-generated catch block                 e.printstacktrace ();             }             Clerk.addproduct ();        }            }     }class Consumer2 implements Runnable{    private Clerk2  Clerk;        public consumer2 (Clerk2 clerk)  {         super ();         this.clerk  = clerk;    }    public void run ()  {  &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;SYSTEM.OUT.PRINTLN ("Consumers buy goods");         while (true) {            try {                 thread.sleep (( int) (Math.random () *10) *1000);            }  catch  (INTERRUPTEDEXCEPTion e)  {                 // TODO Auto-generated catch block                 e.printstacktrace ();             }             Clerk.getproduct ();        }             }    }

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Java uses lock and unlock to implement consumer and producer issues (multithreading)