package ifeve;import java.util.concurrent.atomic.AtomicInteger;import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;/*** @Description* @Author msli* @Date 2021年10月14日*/public class VolatileFeaturesExample {private volatile long v1 = 0L;private long v2 = 0L;private AtomicInteger v3 = new AtomicInteger(0);Lock lock = new ReentrantLock();private long v4 = 0L;private void add() {v1++;v2++;v3.getAndAdd(1);}private void addWithReentrantLock(){lock.lock();v4++;lock.unlock();}public static void main(String[] args) throws InterruptedException {VolatileFeaturesExample example = new VolatileFeaturesExample();Thread[] threads = new Thread[10];for (int i = 0; i < threads.length; i++) {threads[i] = new Thread(() -> {for (int j = 0; j < 1000000; j++) {example.add();example.addWithReentrantLock();}});}for (int i = 0; i < threads.length; i++) {threads[i].start();// threads[i].join();}for (int i = 0; i < threads.length; i++) {threads[i].join();}System.out.println(example.v1);System.out.println(example.v2);System.out.println(example.v3);System.out.println(example.v4);}}
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