Java可重入锁与不可重入锁怎么写

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不可重入锁

//不可重入锁public class LockTest {Lock lock=new Lock();public void a() throws InterruptedException {lock.lock();        b();lock.unlock();    }//不可重入    public void b() throws InterruptedException {lock.lock();       //........        lock.unlock();    }public static void main(String[] args) throws InterruptedException {LockTest lockTest=new LockTest();lockTest.a();lockTest.b();    }    }class Lock{//是否占用    private boolean flag=false;//使用锁    public synchronized void lock() throws InterruptedException {while(flag){            wait();        }flag=true;    }public synchronized void unlock(){flag=false;        notify();    }}

可重入锁

//可重入锁public class LockTest {ReLock lock=new ReLock();public void a() throws InterruptedException {lock.lock();System.out.println(lock.getCount());        b();lock.unlock();System.out.println(lock.getCount());    }//不可重入    public void b() throws InterruptedException {lock.lock();System.out.println(lock.getCount());       //........        lock.unlock();System.out.println(lock.getCount());    }public static void main(String[] args) throws InterruptedException {LockTest lockTest=new LockTest();lockTest.a();Thread.sleep(1000);System.out.println(lockTest.lock.getCount());    }}//可重入锁class ReLock{//是否占用    private boolean flag=false;private Thread LockedBY=null;//存储线程    private int count=0;//使用锁    public synchronized void lock() throws InterruptedException {Thread t=Thread.currentThread();while(flag&&LockedBY!=t){            wait();        }flag=true;LockedBY=t;count++;    }public synchronized void unlock(){if(Thread.currentThread()==LockedBY){count--;if(count==0){flag=false;                notify();LockedBY=null;            }        }    }public int getCount() {return count;    }}

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