安全示例1

同步塊

package cn.hanquan.test;public class HappyTrain {public static void main(String[] args) throws InterruptedException {Count c = new Count();Passenger p1 = new Passenger(c);Passenger p2 = new Passenger(c);Passenger p3 = new Passenger(c);p1.start();p2.start();p3.start();} }class Passenger extends Thread {// extends 繼承類Count count;public Passenger(Count count) {this.count = count;}public void run() {synchronized (count) {count.run();}} }class Count implements Runnable {@Overridepublic void run() {for (int i = 1; i < 6; i++) {try {Thread.sleep(1);} catch (InterruptedException e) {e.printStackTrace();}System.out.println(i);}} }

安全示例2

同步方法

package cn.hanquan.test;public class HappyTrain {public static void main(String[] args) throws InterruptedException {Count c = new Count();Passenger p1 = new Passenger(c);Passenger p2 = new Passenger(c);Passenger p3 = new Passenger(c);p1.start();p2.start();p3.start();} }class Passenger extends Thread {// extends 繼承類Count count;public Passenger(Count count) {this.count = count;}public void run() {count.run();} }class Count implements Runnable {@Overridepublic synchronized void run() {for (int i = 1; i < 6; i++) {try {Thread.sleep(1);} catch (InterruptedException e) {e.printStackTrace();}System.out.println(i);}} }

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