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Spring Framework 2.0.5 API 文档英文版
NullSafeComparator (Spring Framework API 2.0) - Spring Framework 2.0.5 API 文档英文版
org.springframework.util.comparator
Class NullSafeComparator
java.lang.Object
org.springframework.util.comparator.NullSafeComparator
- All Implemented Interfaces:
- Comparator
public class NullSafeComparator
- extends Object
- implements Comparator
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
Constructor Summary |
NullSafeComparator(Comparator comparator,
boolean nullsLow)
Create a NullSafeComparator that sorts null based on the
provided flag, decorating the given Comparator. |
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.
NullSafeComparator
public NullSafeComparator(Comparator 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 objectsnullsLow
- whether to treat nulls lower or higher than non-null objects
compare
public int compare(Object o1,
Object o2)
- Specified by:
compare
in interface Comparator
equals
public boolean equals(Object obj)
- Specified by:
equals
in interface Comparator
- Overrides:
equals
in class Object
hashCode
public int hashCode()
- Overrides:
hashCode
in class Object
toString
public String toString()
- Overrides:
toString
in class Object
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