NullValue (Spring Framework 5.2.12.RELEASE API)

java.lang.Object
- org.springframework.cache.support.NullValue

所有已实现的接口:
Serializable
```
public final class NullValue
extends Object
implements Serializable
```
Simple serializable class that serves as a null replacement for cache stores which otherwise do not support null values.
从以下版本开始:
4.2.2
作者:
Juergen Hoeller
另请参阅:
AbstractValueAdaptingCache, 序列化表格

字段概要

字段
修饰符和类型	字段	说明
`static Object`	`INSTANCE`	The canonical representation of a `null` replacement, as used by the default implementation of `AbstractValueAdaptingCache.toStoreValue(java.lang.Object)`/ `AbstractValueAdaptingCache.fromStoreValue(java.lang.Object)`.

方法概要
所有方法实例方法具体方法
修饰符和类型方法说明
boolean equals(Object obj)
int hashCode()
String toString()
- 从类继承的方法 java.lang.Object
  clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- 字段详细资料
  - INSTANCE
```
public static final Object INSTANCE
```
    The canonical representation of a null replacement, as used by the default implementation of AbstractValueAdaptingCache.toStoreValue(java.lang.Object)/ AbstractValueAdaptingCache.fromStoreValue(java.lang.Object).
    从以下版本开始:
    4.3.10
- 方法详细资料
  - equals
```
public boolean equals(@Nullable
                      Object obj)
```
    覆盖:
    equals 在类中 Object
  - hashCode
```
public int hashCode()
```
    覆盖:
    hashCode 在类中 Object
  - toString
```
public String toString()
```
    覆盖:
    toString 在类中 Object