java.util.concurrent.Callable

java.util.concurrent.Callableのメモ。Callableを使う事で平行処理時に実行されたメソッドが値を返させる事が可能

Callableを実装したクラスを作成

import java.util.concurrent.Callable;

public class SampleTask implements Callable<String> {
    public String call() {
        return "Hello";
    }
}

クライアントを実行

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class Client {
    public static void main(String[] args) throws Exception {
        ExecutorService es = Executors.newSingleThreadExecutor();
        Future<string> ftr = es.submit(new SampleTask());
        String result = ftr.get();
        System.out.println(result);
    }
}