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

Type Parameters:
T - the type of objects that may be compared by this comparator
All Implemented Interfaces:
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.
Since:
1.2.2
Author:
Keith Donald, Juergen Hoeller
See Also:
Comparable

Field Summary

Fields
Modifier and Type	Field	Description
`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.

Constructor Summary

Constructors
Constructor	Description
`NullSafeComparator(Comparator<T> comparator, boolean nullsLow)`	Create a NullSafeComparator that sorts `null` based on the provided flag, decorating the given Comparator.

Method Summary
All Methods Instance Methods Concrete Methods
Modifier and Type Method Description
int compare(T o1, T o2)
boolean equals(Object other)
int hashCode()
String toString()
- Methods inherited from class java.lang.Object
  clone, finalize, getClass, notify, notifyAll, wait, wait, wait
- Methods inherited from interface java.util.Comparator
  reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

- Field Detail
  - NULLS_LOW
```
public static final NullSafeComparator NULLS_LOW
```
    A shared default instance of this comparator, treating nulls lower than non-null objects.
    See Also:
    Comparators.nullsLow()
  - NULLS_HIGH
```
public static final NullSafeComparator NULLS_HIGH
```
    A shared default instance of this comparator, treating nulls higher than non-null objects.
    See Also:
    Comparators.nullsHigh()
- Constructor Detail
  - 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.
    Parameters:
    comparator - the comparator to use when comparing two non-null objects
    nullsLow - whether to treat nulls lower or higher than non-null objects
- Method Detail
  - compare
```
public int compare(@Nullable
                   T o1,
                   @Nullable
                   T o2)
```
    Specified by:
    compare in interface Comparator<T>
  - equals
```
public boolean equals(@Nullable
                      Object other)
```
    Specified by:
    equals in interface Comparator<T>
    Overrides:
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    hashCode in class Object
  - toString
```
public String toString()
```
    Overrides:
    toString in class Object

Modifier and Type	Method	Description
`int`	`compare(T o1, T o2)`
`boolean`	`equals(Object other)`
`int`	`hashCode()`
`String`	`toString()`

Class NullSafeComparator<T>

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Comparator

Field Detail

NULLS_LOW

NULLS_HIGH

Constructor Detail

NullSafeComparator

Method Detail

compare

equals

hashCode

toString