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| graph TB
A(Callable<V>)-->B(DocumentationTool.DocumentationTask)
A-->C(JavaCompiler.CompilationTask)
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一般情况下是配合ExecutorService来使用的，在ExecutorService接口中声明了若干个submit方法的重载版本：
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| <T> Future<T> submit(Callable<T> task);
<T> Future<T> submit(Runnable task, T result);
Future<?> submit(Runnable task);
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| import java.util.Random;
import java.util.concurrent.Callable;
public class CallableExample implements Callable {
@Override
public Object call() throws Exception {
// Create random number generator
Random generator = new Random();
Integer randomNumber = generator.nextInt(5);
// To simulate a heavy computation,
// we delay the thread for some random time
Thread.sleep(randomNumber * 1000);
return randomNumber;
}
}
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