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Java Pass Method as Parameter

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滥情空心 2020-11-22 02:17

I am looking for a way to pass a method by reference. I understand that Java does not pass methods as parameters, however, I would like to get an alternative.

I\'ve

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  • 逝去的感伤
    逝去的感伤 (楼主)
    2020-11-22 02:54

    I appreciate the answers above but I was able to achieve the same behavior using the method below; an idea borrowed from Javascript callbacks. I'm open to correction though so far so good (in production).

    The idea is to use the return type of the function in the signature, meaning that the yield has to be static.

    Below is a function that runs a process with a timeout.

    public static void timeoutFunction(String fnReturnVal) {

    Object p = null; // whatever object you need here

    String threadSleeptime = null;

    Config config;

    try {
        config = ConfigReader.getConfigProperties();
        threadSleeptime = config.getThreadSleepTime();

    } catch (Exception e) {
        log.error(e);
        log.error("");
        log.error("Defaulting thread sleep time to 105000 miliseconds.");
        log.error("");
        threadSleeptime = "100000";
    }

    ExecutorService executor = Executors.newCachedThreadPool();
    Callable task = new Callable() {
        public Object call() {
            // Do job here using --- fnReturnVal --- and return appropriate value
            return null;
        }
    };
    Future future = executor.submit(task);

    try {
        p = future.get(Integer.parseInt(threadSleeptime), TimeUnit.MILLISECONDS);
    } catch (Exception e) {
        log.error(e + ". The function timed out after [" + threadSleeptime
                + "] miliseconds before a response was received.");
    } finally {
        // if task has started then don't stop it
        future.cancel(false);
    }
}

private static String returnString() {
    return "hello";
}

public static void main(String[] args) {
    timeoutFunction(returnString());
}

    
    
             
    
                                                        
    
            
            
    
              
                
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