java thread lock base

The method of operation is defined 

package com.company; // package names 
Import java.util.concurrent.locks.ReentrantLock; 
Import java.util.concurrent.locks.Lock; 
public class the implements the Runnable {Ticket 
    Private ticketnum int = 100; // global variables 
    Lock lock = new ReentrantLock (true) ; // objects 
    @Override 
    public void RUN () {// write RUN () 
        the while (ticketnum> 0) { 
            Lock.lock (); // locking 
            the try { 
                IF (ticketnum> 0 ) { 
                    the try { 
                        the Thread.sleep (100); // working time 
                    } catch (InterruptedException e) {
                        e.printStackTrace (); 
                    } 
                    .. String name = new new the Thread () currentThread () getName (); 
                    System.out.println ( "threads" + name + "movie ticket sales" + ticketnum--); 
                } 
            } 
            a finally { 
                Lock .unlock (); // unlock 
            } 
        } 
    } 
} 


the method is added to the thread

package com.company;
import com.company.ticket;
public class shoupiao {
    public static void main(String[] args) {
        ticket ticket = new ticket();
        Thread thread1 = new Thread(ticket,"窗口1");
        Thread thread2 = new Thread(ticket,"窗口2");
        Thread thread3 = new Thread(ticket,"窗口3");
        thread1.start();
        thread2.start();
        thread3.start();
    }
}