(JAVA)线程之lock和死锁（例）

最新推荐文章于 2025-02-03 10:08:31 发布

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最新推荐文章于 2025-02-03 10:08:31 发布

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分类专栏： java学习日记文章标签： java 开发语言后端

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package thread;
import java.util.concurrent.locks.*;


/**
 * @author Alina
 * @date 2021年12月20日 11:07 下午
 * JDK5新特性
 * import java.util.concurrent.locks 包
 * lock接口
 *      void lock() 获取锁，进同步
 *      void unlock () 释放锁，出同步
 *
 *
 */
class Tickerts implements Runnable{
    private Lock l = new ReentrantLock();
    private int  ticketnum = 100;
    public void run(){
        while(true){

            try{
                l.lock();
                if(ticketnum>0){
                    Thread.sleep(100);
                    System.out.println(Thread.currentThread().getName()+"..."+"出售的票数为："+ticketnum);
                    ticketnum--;
                }

            }catch (Exception e ){}
            finally {
                l.unlock();
            }


        }
    }

}
public class LockDemo {
    public static void main(String[] args) {
        Tickerts ti = new Tickerts();
        Thread t0 = new Thread(ti);
        Thread t1 = new Thread(ti);
        Thread t2 = new Thread(ti);
        t0.start();
        t1.start();
        t2.start();

    }


}

package thread;

/**
 * @author Alina
 * @date 2021年12月20日 11:55 下午
 */
class A_lock{
    public static A_lock A_lock = new A_lock();
}
class B_lock{
    public static B_lock B_lock = new B_lock();
}
class DeadLock implements Runnable {
    private boolean love ;
    public DeadLock(boolean love) {
        this.love = love;
    }
    public void run(){
        while (true){
            if(love){
                synchronized (A_lock.A_lock){
                    System.out.println("A");
                    synchronized (B_lock.B_lock){
                        System.out.println("B");
                    }
                }

            }else {
                synchronized (B_lock.B_lock){
                    System.out.println("B");
                    synchronized (A_lock.A_lock){
                        System.out.println("A");
                    }
                }
            }

        }
    }
}
public class DeadDome {
    public static void main(String[] args) {
        DeadLock d0 = new DeadLock(true);
        DeadLock d1  = new DeadLock(false);
        Thread t0 = new Thread(d0);
        Thread t1 = new Thread(d1);
        t0.start();
        t1.start();

    }
}