How to use Future in java

Explanation

1. The Future interface represents the asynchronous calculation result and provides methods to check whether the calculation result is completed and obtain the calculation result.

2. The FutureTask class provides the implementation of the Future interface and implements the Runnable interface.

Example

public class MyCallable implements Callable<Integer> {
    public Integer call() {
        int sum = 0;
        for (int i = 0; i <= 100; i++) {
            sum += i;
        }
        return new Integer(sum);
    }
}
public class Demo{
    public static void main(String[] args) {
        MyCallable callable = new MyCallable();
        FutureTask<Integer> result = new FutureTask<Integer>(callable);
        new Thread(result).start();
        try {
            Integer value = result.get();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
    }
}

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