A Future interface implementation object is used to represent the result of an asynchronous computation in Java competition.
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A Future interface provides methods to check if the calculation is complete Wholesale Switzerland Soccer Jerseys , wait for its completion and retrieve the result of the calculation. The result is retrieved using the Future get method when the calculation is finished, and it crashes until it is finished. The cancellation is done by the cancellation method. The cancel method returns true if the task has been canceled and has no effect and returns false if the task has already been completed or already canceled or cannot be undone for some reason. After a successful cancellation, tasks that did not start will not be executed. The may Interrupt If Running parameter determines whether jobs already started should be interrupted to try to stop the task. Additional methods is Done () and is Cancelled () determine whether the task was terminated normally or was canceled.
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Once the calculation is complete Wholesale Switzerland Jerseys , the calculation cannot be canceled. If a task is executed by throwing an exception, the corresponding Future. Get file is rewritten and wrapped in Execution Exception; and if it was canceled, Future. Get throws Cancellation Exception. If Future. Get throws Execution Exception Cheap Switzerland Soccer Jerseys , the underlying exception can be retrieved with get Cause. The submission method in Executor Service returns a future when you submit a Runnable or a Callable. The Runnable or Callable is published securely from the thread to the thread that will execute the task. The result value for a future is also published securely from the thread in which it was calculated to any thread that retrieves it via get.
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Future Task is an implementation of Future. You can explicitly instantiate a Future Task for a Runnable or Callable. A Future Task can be submitted to an Executor for execution while Future Task implements Runnable. Future Task can also be run directly by calling its run method. Once a Future Task enters the finished state, it remains in this state forever. If the task is complete. Future Task builders can accept Callable or Runnable.
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Callable is similar to Runnable, but it can return a result unlike Runnable. Callable can be in one of three states: pending to run Cheap Switzerland Jerseys , running, or terminated. Completion can be a normal completion, a cancellation and an exception. The tasks described by Callable can throw checked and unverified exceptions Yann Sommer Switzerland Jersey , and any code can generate an error. When used with Future, any object launched from the Callable is wrapped in Execution Exception and restarted from Future. Get. The code that the get calls must handle the possibility of Execution Exception (and the exception Cancellation Exception not checked). The cause of Execution Exception is returned as Throw able and can be retrieved with the get Cause method.
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