java lock四种用法

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本文深入探讨了Java中ReentrantLock的使用方法，包括普通锁、尝试锁、可中断锁及延时锁的实现与应用场景，通过实例代码展示了不同锁机制的特点。

该文章已生成可运行项目，

1.普通用法

public static void testlock() {
		Lock lock = new ReentrantLock();
		Thread t = new Thread(new Runnable() {

			@Override
			public void run() {
				// TODO Auto-generated method stub
				lock.lock();
				try {
					Thread.sleep(1000);
					System.out.println("goon");
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} finally {
					lock.unlock();
				}
			}

		});

		t.start();
		System.out.println("start");
		lock.lock();
		System.out.println("over");
		lock.unlock();
	}

start
goon
over

2.trylock

public static void testtry() {
		Lock lock = new ReentrantLock();
		Thread t = new Thread(new Runnable() {

			@Override
			public void run() {
				// TODO Auto-generated method stub
				lock.lock();
				System.out.println("get");
				try {
					Thread.sleep(1000);
					
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} finally {
					lock.unlock();
					System.out.println("release");
				}
			}

		});

		Thread t1 = new Thread(new Runnable() {
			
			@Override
			public void run() {
				// TODO Auto-generated method stub
				
				try {
					Thread.sleep(100);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				
				while (true) {
					if (lock.tryLock()) {
							System.out.println("get success");
							lock.unlock();
							break;
					}else {
						System.out.println("get faile ... ");
						try {
							Thread.sleep(100);
						} catch (InterruptedException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
					}
				}
			}

		});
		
		t.start();
		t1.start();

	}

get
get faile ... 
get faile ... 
get faile ... 
get faile ... 
get faile ... 
get faile ... 
get faile ... 
get faile ... 
get faile ... 
release
get success

3.interruptlock

public static void testinterrupt() {
		Lock lock = new ReentrantLock();
		Thread t = new Thread(new Runnable() {

			@Override
			public void run() {
				// TODO Auto-generated method stub
				lock.lock();
				try {
					Thread.sleep(10000);
					System.out.println("goon ...");
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} finally {
					lock.unlock();
				}
			}

		});
		
		Thread t1 = new Thread(new Runnable() {

			@Override
			public void run() {
				// TODO Auto-generated method stub
				try {
					lock.lockInterruptibly();
					System.out.println("get ...");
					lock.unlock();
				} catch (InterruptedException e1) {
					// TODO Auto-generated catch block
					//e1.printStackTrace();
					
					System.out.println("interrupt ... ");
				}
				
			}

		});
		
		t.start();
		t1.start();
		
		try {
			Thread.sleep(5000);
		}catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		System.out.println("to interrupt ");
		t1.interrupt();
	}

to interrupt 
interrupt ... 
goon ...

4.delay

public static void testdelay() {
		Lock lock = new ReentrantLock();
		Thread t = new Thread(new Runnable() {

			@Override
			public void run() {
				// TODO Auto-generated method stub
				lock.lock();
				try {
					Thread.sleep(10000);
					System.out.println("goon ...");
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} finally {
					lock.unlock();
				}
			}

		});
		
		Thread t1 = new Thread(new Runnable() {

			@Override
			public void run() {
				// TODO Auto-generated method stub
				try {
					if(lock.tryLock(5, TimeUnit.SECONDS)) {
						System.out.println("get ...");
						lock.unlock();
					}else {
						System.out.println("have not get  ...");
					}
				} catch (InterruptedException e1) {
					// TODO Auto-generated catch block
					//e1.printStackTrace();
					
					System.out.println("interrupt ... ");
				}
				
			}

		});
		
		t.start();
		t1.start();
	}