From the course: Parallel and Concurrent Programming with Java 2
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Future: Java demo - Java Tutorial
From the course: Parallel and Concurrent Programming with Java 2
Future: Java demo
- [Instructor] To get the result back from an asynchronous task in Java I can use the callable interface which represents a task that returns a result of a specified type. The callable interface is similar to Java's runnable interface except that instead of having a method named run that returns void the callable interface has a single method named call which returns a value of some type and may throw an exception as well. To demonstrate creating and using a callable, I'll start with this basic shell of a Java program. First, I'll import the java.util.concurrent package into this program. Then I'll create a new class called HowManyVegetables that implements the callable interface. Within that class I'll create a public method named call that returns an integer value and throws an exception. My call method will print a message that Olivia is counting vegetables. Then I'll have it sleep for three seconds to simulate the time it takes for her to complete that task. And finally the method…
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