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Java 5以前实现多线程有两种实现方法:一种是继承Thread类;另一种是实现Runnable接口。两种方式都要通过重写run()方法来定义线程的行为,推荐使用后者,因为Java中的继承是单继承,一个类有一个父类,如果继承了Thread类就无法再继承其他类了,显然使用Runnable接口更为灵活。
补充:Java 5以后创建线程还有第三种方式:实现Callable接口,该接口中的call方法可以在线程执行结束时产生一个返回值,代码如下所示:
package chimomo.learning.java.code.multithreading.callable;
import java.util.concurrent.Callable;
/**
* @author Created by Chimomo
*/
class MyTask implements Callable<Integer> {
private int upperBounds;
public MyTask(int upperBounds) {
this.upperBounds = upperBounds;
}
@Override
public Integer call() {
int sum = 0;
for (int i = 1; i <= upperBounds; i++) {
sum += i;
}
return sum;
}
}
package chimomo.learning.java.code.multithreading.callable;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
/**
* @author Created by Chimomo
*/
public class MyTaskTest {
public static void main(String[] args) throws Exception {
List<Future<Integer>> list = new ArrayList<>();
ExecutorService service = Executors.newFixedThreadPool(10);
for (int i = 0; i < 10; i++) {
list.add(service.submit(new MyTask((int) (Math.random() * 100))));
}
int sum = 0;
for (Future<Integer> future : list) {
// while(!future.isDone()) ;
sum += future.get();
}
System.out.println(sum);
}
}