import java.util.Random;/*** TODO 在此寫上類的相關說明.<br>* @author gongqiang <br>* @version 1.0.0 2021年6月3日<br>* @see * @since JDK 1.5.0*/ public class SynchronizedDemo {/*** 中間值.*/private Integer value;/*** @param args*/public static void main(String[] args) {final SynchronizedDemo syn = new SynchronizedDemo();new Thread(() -> {while (true) {try {synchronized (SynchronizedDemo.class) {final Integer value = new Random().nextInt();syn.value = value;System.out.println("設置共享" + value);Thread.sleep(3000);}// 休眠，讓獲取線程能夠讀取共享變量.try {Thread.sleep(100);} catch (InterruptedException e) {Thread.currentThread().interrupt();}} catch (InterruptedException e) {Thread.currentThread().interrupt();}}}).start();new Thread(() -> {while (true) {synchronized (SynchronizedDemo.class) {final Integer value = syn.value;System.out.println("獲取共享" + value);}// 休眠，讓設置線程能夠設置共享變量.try {Thread.sleep(500);} catch (InterruptedException e) {Thread.currentThread().interrupt();}}}).start();try {Thread.sleep(60 * 60 * 1000);} catch (InterruptedException e) {// 無需處理.}} }

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