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oracle.javatools.util
Class Holder<T>

java.lang.Object
oracle.javatools.util.Holder<T>

public class Holder<T>

extends java.lang.Object

A mutable holder class modeled on the JAX-WS 2.0 Holder class that simply provides a common way of providing an in/out parameter without the need to resort to untidy one length array parameters.

This can also be applied to cases where you need a return value back from a inner or local class. Take for example code that requires the use of the Runnable interface, the following code could be used:

   final Holder<Integer> h = new Holder(3);
   SwingUtilities.invokeAndWait(new Runnable()
   {
     public void run()
     {
       h.set(doSomethingClever());
     }
   });
  
   return 9 + h.get();
 

Ideally in the above exmaple you would use and API that could make use of the Future interface; but in many cases API have not been updated.

Field Summary

T

value

Constructor Summary

Holder()

Holder(T value)

Method Summary

T	get()
void	set(T value)
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

value

public T value

Constructor Detail

Holder

public Holder()

Holder

public Holder(T value)

Method Detail

get

public T get()

set

public void set(T value)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

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