从 Runnable 返回值

java runnable

2022-08-31 15:08:59

的方法具有返回类型，不能返回值。但是，我想知道是否有任何解决此问题的方法。runRunnablevoid

我有一个这样的方法：

public class Endpoint {
    public method() {
       Runnable runcls = new RunnableClass();
       runcls.run()
    }
}

方法如下：run

public class RunnableClass implements Runnable {
    
    public JaxbResponse response;

    public void run() {
        int id = inputProxy.input(chain);
        response = outputProxy.input();
    }
}

我想访问中的变量。这可能吗？responsemethod

答案 1

使用而不是使用接口。Callable<V>Runnable

例：

public static void main(String args[]) throws Exception {
    ExecutorService pool = Executors.newFixedThreadPool(3);
    Set<Future<Integer>> set = new HashSet<>();

    for (String word : args) {
      Callable<Integer> callable = new WordLengthCallable(word);
      Future<Integer> future = pool.submit(callable);
      set.add(future);
    }

    int sum = 0;
    for (Future<Integer> future : set) {
      sum += future.get();
    }

    System.out.printf("The sum of lengths is %s%n", sum);
    System.exit(sum);
}

在此示例中，您还需要实现类，该类实现接口。WordLengthCallableCallable

答案 2

public void check() {
    ExecutorService executor = Executors.newSingleThreadExecutor();
    Future<Integer> result = executor.submit(new Callable<Integer>() {
        public Integer call() throws Exception {
            return 10;
        }
    });

    try {
        int returnValue = result.get();
    } catch (Exception exception) {
       //handle exception
    }
}