CountDownLatch

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CountryEnum.java

package thread;public enum CountryEnum {ONE(1, "齊"), TWO(2, "楚"), THREE(3, "燕"), FOUR(4, "趙"), FIVE(5, "魏"), SIX(6, "韓");private Integer retCode;private String retMsg;CountryEnum(Integer retCode, String retMsg) {this.retCode = retCode;this.retMsg = retMsg;}public Integer getRetCode() {return retCode;}public void setRetCode(Integer retCode) {this.retCode = retCode;}public String getRetMsg() {return retMsg;}public void setRetMsg(String retMsg) {this.retMsg = retMsg;}public static CountryEnum list(int idx) {CountryEnum[] countryEnums = CountryEnum.values();for (CountryEnum countryEnum : countryEnums) {if (idx==countryEnum.getRetCode())return countryEnum;}return null;} }

CountDownLatchDemo.java

package thread;import java.util.concurrent.CountDownLatch;public class CountDownLatchDemo {public static void main(String[] args) throws InterruptedException {leaveClassroom();county();}private static void county() throws InterruptedException {CountDownLatch countDownLatch=new CountDownLatch(6);for (int i = 1; i <=6 ; i++) {new Thread(()->{System.out.println(Thread.currentThread().getName()+"\t 國被滅");countDownLatch.countDown();}, CountryEnum.list(i).getRetMsg()).start();}countDownLatch.await();System.out.println(Thread.currentThread().getName()+"\t ******秦國一統(tǒng)華夏");}private static void leaveClassroom() throws InterruptedException {CountDownLatch countDownLatch=new CountDownLatch(6);for (int i = 1; i <=6 ; i++) {new Thread(()->{System.out.println(Thread.currentThread().getName()+"\t上完自習，離開教室");countDownLatch.countDown();},String.valueOf(i)).start();}countDownLatch.await();System.out.println(Thread.currentThread().getName()+"\t ******班長最后關門走人");} }

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