FeatureMatcher (JUnit API 文档)

java.lang.Object
- org.hamcrest.BaseMatcher<T>
- - org.hamcrest.TypeSafeDiagnosingMatcher<T>
  - - org.hamcrest.FeatureMatcher<T,U>

类型参数:
T - The type of the object to be matched
U - The type of the feature to be matched
所有已实现的接口:
Matcher<T>, SelfDescribing
```
public abstract class FeatureMatcher<T,U>
extends TypeSafeDiagnosingMatcher<T>
```
Supporting class for matching a feature of an object. Implement featureValueOf() in a subclass to pull out the feature to be matched against.

构造器概要
构造器
构造器说明
FeatureMatcher(Matcher<? super U> subMatcher, String featureDescription, String featureName)
Constructor

方法概要

所有方法实例方法抽象方法具体方法
修饰符和类型	方法	说明
`void`	`describeTo(Description description)`	Generates a description of the object.
`protected abstract U`	`featureValueOf(T actual)`	Implement this to extract the interesting feature.
`protected boolean`	`matchesSafely(T actual, Description mismatch)`	Subclasses should implement this.

从类继承的方法 org.hamcrest.TypeSafeDiagnosingMatcher
describeMismatch, matches

从类继承的方法 org.hamcrest.BaseMatcher
_dont_implement_Matcher___instead_extend_BaseMatcher_, toString

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- 构造器详细资料
  - FeatureMatcher
```
public FeatureMatcher(Matcher<? super U> subMatcher,
                      String featureDescription,
                      String featureName)
```
    Constructor
    参数:
    subMatcher - The matcher to apply to the feature
    featureDescription - Descriptive text to use in describeTo
    featureName - Identifying text for mismatch message
- 方法详细资料
  - featureValueOf
```
protected abstract U featureValueOf(T actual)
```
    Implement this to extract the interesting feature.
    参数:
    actual - the target object
    返回:
    the feature to be matched
  - matchesSafely
```
protected boolean matchesSafely(T actual,
                                Description mismatch)
```
    从类复制的说明: TypeSafeDiagnosingMatcher
    Subclasses should implement this. The item will already have been checked for the specific type and will never be null.
    指定者:
    matchesSafely 在类中 TypeSafeDiagnosingMatcher<T>
  - describeTo
```
public final void describeTo(Description description)
```
    从接口复制的说明: 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.