技術標籤：# 多執行緒多執行緒threadjava

Callable介面說明

簡單示例

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;
/**
 * @author layman
 * @date 2021/2/10
 */
public class Demo01 {
    public static void main(String[] args) throws ExecutionException,
 
 InterruptedException {
        Callable<Integer> callable = new Demo01Callable();
        FutureTask<Integer> task = new FutureTask(callable);
        Thread t = new Thread(task);
        t.setName("測試callable執行緒");
        t.start();
        System.out.println("執行緒返回的值為： "
 
 + task.get());
    }
}
class Demo01Callable implements Callable<Integer>{

    @Override
    public Integer call() throws Exception{
        System.out.println(Thread.currentThread().getName()+"呼叫了call方法");
        int val = (int)(Math.random()*10);
        System.out.println("準備返回的值是： "
 
 + val);
        return val;
    }
}