Callable (Java SE 9 & JDK 9 ) (original) (raw)

• Type Parameters:
  V - the result type of method call
  All Known Subinterfaces:
  [DocumentationTool.DocumentationTask](../../../javax/tools/DocumentationTool.DocumentationTask.html "interface in javax.tools"), [JavaCompiler.CompilationTask](../../../javax/tools/JavaCompiler.CompilationTask.html "interface in javax.tools")
  All Known Implementing Classes:
  [JavacTask](../../../com/sun/source/util/JavacTask.html "class in com.sun.source.util")
  Functional Interface:
  This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface Callable
A task that returns a result and may throw an exception. Implementors define a single method with no arguments calledcall.
The Callable interface is similar to Runnable, in that both are designed for classes whose instances are potentially executed by another thread. ARunnable, however, does not return a result and cannot throw a checked exception.
The Executors class contains utility methods to convert from other common forms to Callable classes.
Since:
1.5
See Also:
Executor

• • Method Summary

  All Methods Instance Methods Abstract Methods

  Modifier and Type	Method	Description
  V	call​()	Computes a result, or throws an exception if unable to do so.

• • Method Detail

     * #### call  
     [V](../../../java/util/concurrent/Callable.html "type parameter in Callable") call​()  
     throws [Exception](../../../java/lang/Exception.html "class in java.lang")  
     Computes a result, or throws an exception if unable to do so.  
     Returns:  
     computed result  
     Throws:  
     `[Exception](../../../java/lang/Exception.html "class in java.lang")` \- if unable to compute a result

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