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继承Thread类#xff1a;void run()方法没有返回值#xff0c;无法抛异常实现Runnable接口#xff1a;void run()方法没有返回值#xff0c;无法抛异常实现Callable接口#xff1a;V call() throws Exception 返回结果#xff0c;能够抛异常
实现Callab…线程的实现方式
继承Thread类void run()方法没有返回值无法抛异常实现Runnable接口void run()方法没有返回值无法抛异常实现Callable接口V call() throws Exception 返回结果能够抛异常
实现Callable接口
1创建Callable接口的实现类并实现call()方法该call()方法将作为线程执行体并且有返回值。
2创建Callable实现类的实例使用FutureTask类来包装Callable对象该FutureTask对象封装了该Callable对象的call()方法的返回值。
3使用FutureTask对象作为Thread对象的target创建并启动新线程。
4调用FutureTask对象的get()方法来获得子线程执行结束后的返回值
任务 四匹马跑一千米比赛每匹马的速度通过1~10的随机数来产生输出哪匹马是冠军 RunTask1.java代码 import java.util.Random;
import java.util.concurrent.Callable;/*** 跑步任务*/public class RunTask1 implements CallableLong {// step/100ms 是否睡着 睡觉时间// 通过方法形参接收参数// 定义属性private int step;private boolean isSleep;private int sleepTime;public RunTask1(int step,boolean isSleep,int sleepTime){this.stepstep;this.isSleepisSleep;this.sleepTimesleepTime;}Overridepublic Long call() throws Exception {int distance0;long start System.currentTimeMillis();while(true){distancestep;if (isSleep) {if (distance 800) { //跑到800米try {System.out.println(Thread.currentThread().getName() 睡 sleepTime ms);Thread.sleep(sleepTime);} catch (InterruptedException e) {e.printStackTrace();}}}if(distance1000){break;}System.out.println(Thread.currentThread().getName() 跑完 distance 米);}try {Thread.sleep(100);} catch (InterruptedException e) {e.printStackTrace();}return System.currentTimeMillis()-start;}
}Test.java代码 import java.util.Random;
import java.util.concurrent.FutureTask;public class Test {public static void main(String[] args) throws Exception {//第一匹马的跑步任务RunTask1 horse1new RunTask1(new Random().nextInt(10)1,true,200);FutureTaskLong horseResult new FutureTask(horse1);Thread t1new Thread(horseResult,马1);//第二匹马的跑步任务RunTask1 horse2new RunTask1(new Random().nextInt(10)1,true,400);FutureTaskLong horseResult1 new FutureTask(horse2);Thread t2new Thread(horseResult1,马2);//第三匹马的跑步任务RunTask1 horse3new RunTask1(new Random().nextInt(10)1,true,5500);FutureTaskLong horseResult2 new FutureTask(horse3);Thread t3new Thread(horseResult2,马3);//第四匹马的跑步任务RunTask1 horse4new RunTask1(new Random().nextInt(10)1,false,0);FutureTaskLong horseResult3 new FutureTask(horse4);Thread t4new Thread(horseResult3,马4);t1.start();t2.start();t3.start();t4.start();//统计比赛结果一定要等main线程执行否则 Horse1的线程还没跑完就输出了winner is Horse2if((horseResult.get().longValue() horseResult1.get().longValue()) (horseResult.get().longValue() horseResult2.get().longValue()) (horseResult.get().longValue() horseResult3.get().longValue())){System.out.println(winner is t1.getName());}else if((horseResult1.get().longValue() horseResult.get().longValue()) (horseResult1.get().longValue() horseResult2.get().longValue()) (horseResult1.get().longValue() horseResult3.get().longValue())){System.out.println(winner is t2.getName());}else if((horseResult2.get().longValue() horseResult.get().longValue()) (horseResult2.get().longValue() horseResult1.get().longValue()) (horseResult2.get().longValue() horseResult3.get().longValue())){System.out.println(winner is t3.getName());}else if(horseResult3.get().longValue() horseResult.get().longValue() (horseResult3.get().longValue() horseResult1.get().longValue()) (horseResult3.get().longValue() horseResult2.get().longValue())){System.out.println(winner is t4.getName());}else System.out.println(平局);}
}控制台输出想要结果不一样可以通过设置哪一匹马会睡眠从而改变结果代码还是有不足
