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  • Java死锁

    产生死锁原因:

    1.系统资源不足.

    2.进程运行推进的顺序不合适

    3.资源分配不当

    import java.util.concurrent.TimeUnit;
    
    class HoldLockThread implements Runnable {
        private String lockA;
        private String lockB;
    
        public HoldLockThread(String lockA, String lockB) {
            this.lockA = lockA;
            this.lockB = lockB;
        }
    
        @Override
        public void run() {
            synchronized (lockA) {
                System.out.println(Thread.currentThread().getName() + "	 自己持有:" + lockA +
                        "	 尝试获得:" + lockB);
                try {
                    TimeUnit.SECONDS.sleep(2);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
    
                synchronized (lockB) {
                    System.out.println(Thread.currentThread().getName() + "	 自己持有:" + lockB + "	 尝试获得:" + lockA);
                }
            }
        }
    }
    
    public class DeadLockDemo {
        public static void main(String[] args) {
            String lockA = "lockA";
            String lockB="lockB";
            new Thread(new HoldLockThread(lockA,lockB),"ThreadAA").start();
            new Thread(new HoldLockThread(lockB,lockA),"ThreadBB").start();
        }
    }
    

      解决:

     

     JVM体系:

    常见的垃圾回收算法:

    引用计数:

     复制:

     

     标记清除:

     标记整理:

     

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  • 原文地址:https://www.cnblogs.com/sunliyuan/p/12623415.html
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