import java.util.concurrent.locks.ReentrantLock;
class ZiYuan {
ReentrantLock reentrantLock = new ReentrantLock();
public void method1() {
reentrantLock.lock();
try {
System.out.println("进入方法1");
System.out.println("准备调用方法2");
method2();
} catch (Exception e) {
e.printStackTrace();
} finally {
reentrantLock.unlock();
}
}
public void method2() {
reentrantLock.lock();
try {
System.out.println("进入方法2");
} catch (Exception e) {
e.printStackTrace();
} finally {
reentrantLock.unlock();
}
}
}
public class MyLock {
public static void main(String[] args) {
ZiYuan ziYuan=new ZiYuan();
ziYuan.method1();
}
}
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
public class MyReadWriteLock{
public static void main(String[] args){
ReadWriteLockDemo rwd = new ReadWriteLockDemo();
//启动100个读线程
for (int i = 0; i < 100; i++) {
new Thread(new Runnable() {
@Override
public void run() {
rwd.get();
}
}).start();
}
//写线程
new Thread(new Runnable() {
@Override
public void run() {
rwd.set((int)(Math.random()*101));
}
},"Write").start();
}
}
class ReadWriteLockDemo{
//模拟共享资源--Number
private int number = 0;
// 实际实现类--ReentrantReadWriteLock，默认非公平模式
private ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
//读
public void get(){
//使用读锁
readWriteLock.readLock().lock();
try {
System.out.println(Thread.currentThread().getName()+" : "+number);
}finally {
readWriteLock.readLock().unlock();
}
}
//写
public void set(int number){
readWriteLock.writeLock().lock();
try {
this.number = number;
System.out.println(Thread.currentThread().getName()+" : "+number);
}finally {
readWriteLock.writeLock().unlock();
}
}
}
原文：https://www.cnblogs.com/wangdayexinyue/p/12570695.html