NullSafeComparator (Spring Framework 4.3.30.RELEASE API)

java.lang.Object
- org.springframework.util.comparator.NullSafeComparator<T>

所有已实现的接口:
Comparator<T>
```
public class NullSafeComparator<T>
extends Object
implements Comparator<T>
```
A Comparator that will safely compare nulls to be lower or higher than other objects. Can decorate a given Comparator or work on Comparables.
从以下版本开始:
1.2.2
作者:
Keith Donald, Juergen Hoeller
另请参阅:
Comparable

字段概要

字段
修饰符和类型	字段	说明
`static NullSafeComparator`	`NULLS_HIGH`	A shared default instance of this comparator, treating nulls higher than non-null objects.
`static NullSafeComparator`	`NULLS_LOW`	A shared default instance of this comparator, treating nulls lower than non-null objects.

构造器概要
构造器
构造器说明
NullSafeComparator(Comparator<T> comparator, boolean nullsLow)
Create a NullSafeComparator that sorts null based on the provided flag, decorating the given Comparator.

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
int compare(T o1, T o2)
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
- 从接口继承的方法 java.util.Comparator
  reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

- 字段详细资料
  - NULLS_LOW
```
public static final NullSafeComparator NULLS_LOW
```
    A shared default instance of this comparator, treating nulls lower than non-null objects.
  - NULLS_HIGH
```
public static final NullSafeComparator NULLS_HIGH
```
    A shared default instance of this comparator, treating nulls higher than non-null objects.
- 构造器详细资料
  - NullSafeComparator
```
public NullSafeComparator(Comparator<T> comparator,
                          boolean nullsLow)
```
    Create a NullSafeComparator that sorts null based on the provided flag, decorating the given Comparator.
    When comparing two non-null objects, the specified Comparator will be used. The given underlying Comparator must be able to handle the elements that this Comparator will be applied to.
    参数:
    comparator - the comparator to use when comparing two non-null objects
    nullsLow - whether to treat nulls lower or higher than non-null objects
- 方法详细资料
  - compare
```
public int compare(T o1,
                   T o2)
```
    指定者:
    compare 在接口中 Comparator<T>
  - equals
```
public boolean equals(Object obj)
```
    指定者:
    equals 在接口中 Comparator<T>
    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