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CallableAndFuture

Pragya Keshap answered on February 22, 2023 Popularity 1/10 Helpfulness 1/10

answer CallableAndFuture

CallableAndFuture

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In fact, the Future can be made to work with Runnable as well, which is something that will become clear when Executors come into the picture.

public boolean cancel(boolean mayInterrupt): Used to stop the task. It stops the task if it has not started. If it has started, it interrupts the task only if mayInterrupt is true.

public Object get() throws InterruptedException, ExecutionException: Used to get the result of the task. If the task is complete, it returns the result immediately, otherwise it waits till the task is complete and then returns the result.

public boolean isDone(): Returns true if the task is complete and false otherwise

class CallableImpl implements Callable<Integer> {

    private int myName;

    CallableImpl(int i) {
        myName = i;
    }

    @Override
    public Integer call() {
        for (int i = 0; i < 10; i++) {
            System.out.println("Thread : " + getMyName() + " value is : " + i);
        }
        return getMyName();
    }

    public int getMyName() {
        return myName;
    }

    public void setMyName(int myName) {
        this.myName = myName;
    }
}

public class CallableTester {

    public static void main(String[] args) throws InterruptedException {

        Callable<Integer> callable = new CallableImpl(2);
        ExecutorService executor = new ScheduledThreadPoolExecutor(1);
        Future<Integer> future = executor.submit(callable);

        try {
            System.out.println("Future value: " + future.get());
        } catch (Exception ignored) {}
        executor.shutdown();
        executor.awaitTermination(1, TimeUnit.HOURS);
    }

}

https://www.geeksforgeeks.org/callable-future-java/

Popularity 1/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java

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Contributed on Feb 22 2023

Pragya Keshap

0 Answers Avg Quality 2/10

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