多线程——Callable接口

package pers.aaa.callable;

import java.util.concurrent.Callable;

public class MyCallable implements Callable<Integer>{

    public Integer call() throws Exception {//call方法可以抛出异常，run不能
            int sum=0;
            for(int i=0;i<=100;i++)
                sum=sum+i;
            return sum;//call方法有返回值
        
    }

}

package pers.aaa.callable;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

public class Test {
public static void main(String[] args) throws InterruptedException, ExecutionException {
     MyCallable mc=new MyCallable();
     FutureTask<Integer> result =  new FutureTask<Integer>(mc);//创建一个 FutureTask，一旦运行就执行给定的 Callable
     new Thread(result).start();
     Integer sum = result.get();  
     System.out.println(sum);
}
}