IsNull (JUnit API)

Junit


org.hamcrest.core Class IsNull<T>

java.lang.Object
  extended by org.hamcrest.BaseMatcher<T>
      extended by org.hamcrest.core.IsNull<T>
所有已实现接口:
org.hamcrest.Matcher<T>, org.hamcrest.SelfDescribing

public class IsNull<T>
extends org.hamcrest.BaseMatcher<T>

Is the value null?


构造器摘要
IsNull()
           
 
方法摘要
 void describeTo(org.hamcrest.Description description)
          Generates a description of the object.
 boolean matches(Object o)
          Evaluates the matcher for argument item.
static
<T> org.hamcrest.Matcher<T>
notNullValue()
          Matches if value is not null.
static
<T> org.hamcrest.Matcher<T>
notNullValue(Class<T> type)
          Matches if value is not null.
static
<T> org.hamcrest.Matcher<T>
nullValue()
          Matches if value is null.
static
<T> org.hamcrest.Matcher<T>
nullValue(Class<T> type)
          Matches if value is null.  
类方法继承: org.hamcrest.BaseMatcher
_dont_implement_Matcher___instead_extend_BaseMatcher_, toString
 
类方法继承: java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

构造器详细信息

IsNull

public IsNull()
方法详细信息

matches

public boolean matches(Object o)
Description copied from interface: org.hamcrest.Matcher
Evaluates the matcher for argument item.

This method matches against Object, instead of the generic type T. This is because the caller of the Matcher does not know at runtime what the type is (because of type erasure with Java generics). It is down to the implementations to check the correct type.

参数:
o - the object against which the matcher is evaluated.
返回:
true if item matches, otherwise false.
另请参见:
BaseMatcher

describeTo

public void describeTo(org.hamcrest.Description description)
Description copied from interface: org.hamcrest.SelfDescribing
Generates a description of the object. The description may be part of a a description of a larger object of which this is just a component, so it should be worded appropriately.

参数:
description - The description to be built or appended to.

nullValue

public static <T> org.hamcrest.Matcher<T> nullValue()
Matches if value is null.


notNullValue

public static <T> org.hamcrest.Matcher<T> notNullValue()
Matches if value is not null.


nullValue

public static <T> org.hamcrest.Matcher<T> nullValue(Class<T> type)
Matches if value is null. With type inference.


notNullValue

public static <T> org.hamcrest.Matcher<T> notNullValue(Class<T> type)
Matches if value is not null. With type inference.