Java에서 읽기-쓰기 잠금 작업에 ReadWriteLock 함수를 사용하는 방법

ReadWriteLock rwLock = new ReentrantReadWriteLock();

Lock readLock = rwLock.readLock();
readLock.lock();
try {
    // 进行读操作
} finally {
    readLock.unlock();
}

Lock writeLock = rwLock.writeLock();
writeLock.lock();
try {
    // 进行写操作
} finally {
    writeLock.unlock();
}

// 读操作需要获取读锁
readLock.lock();
try {
    // 进行读操作
} finally {
    readLock.unlock();
}

// 写操作需要获取写锁
writeLock.lock();
try {
    // 进行写操作
} finally {
    writeLock.unlock();
}

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

public class ReadWriteLockDemo {

    private static int value = 0;
    private static final ReadWriteLock rwLock = new ReentrantReadWriteLock();
    private static final Lock readLock = rwLock.readLock();
    private static final Lock writeLock = rwLock.writeLock();

    public static void main(String[] args) {
        new Thread(ReadWriteLockDemo::read).start();
        new Thread(ReadWriteLockDemo::read).start();
        new Thread(ReadWriteLockDemo::write).start();
        new Thread(ReadWriteLockDemo::write).start();
    }

    public static void read() {
        readLock.lock();
        try {
            System.out.println(Thread.currentThread().getName() + ": 当前值 = " + value);
        } finally {
            readLock.unlock();
        }
    }

    public static void write() {
        writeLock.lock();
        try {
            value = (int) (Math.random() * 100);
            System.out.println(Thread.currentThread().getName() + ": 写入值 = " + value);
        } finally {
            writeLock.unlock();
        }
    }
}