com.mockobjects.util
public class Null extends Object
null
value.
The Null
class is used when an
Expectation
is set to expect nothing.
Example usage:
public class MockX { private Expectation... anExpectation = new Expectation...(...); public MockX() { anExpectation.setExpectNothing(); } public void setAnExpectation(Object value) { anExpectation.setExpected(value); } public void setActual(Object value) { anExpectation.setActual(value); } }The act of calling
Expectation.setExpectNothing()
tells the expectation that it should expect no values to change. Since
all Null
objects are equal to themselves,
most expectations set their expected value to an instance of
Null
, and at the same time, set their actual
value to another instance of Null
.
This way, when verify()
checks
expectations, they will compare two Null
objects together, which is guaranteed to succeed.Version: $Id: Null.java,v 1.3 2002/03/28 18:16:54 custommonkey Exp $
Field Summary | |
---|---|
static String | DEFAULT_DESCRIPTION
The default description for all Null
objects.
|
static Null | NULL
A default Null object.
|
Constructor Summary | |
---|---|
Null()
Instantiates a new Null object with
the default description. | |
Null(String description)
Instantiates a new Null object and
sets it's description. |
Method Summary | |
---|---|
boolean | equals(Object other)
Determines equality between two objects.
Null objects are only equal to
another instance of themselves. |
int | hashCode()
Returns this Null object's hashCode.
|
String | toString()
Returns a string representation of this Null
object.
|
Null
objects.
This String is equal to "Null
". Null
object.
Instead of always instantiating new Null
objects, consider using a reference to this object instead. This way,
the virtual machine will not be taking the time required to instantiate
an object everytime it is required. Null
object with
the default description.See Also: DEFAULT_DESCRIPTION
Null
object and
sets it's description.Parameters: description
Null
objects are only equal to
another instance of themselves.Parameters: other
Null
object.
This merely returns the string passed to the constructor initially.