IdentityKey (AO Collections 3.0.0 API)

java.lang.Object
- com.aoapps.collections.IdentityKey<T>

```
public class IdentityKey<T>
extends Object
```
Allows any object to be used as a hash key, with identity used for hashCode() and equals(java.lang.Object). They may be used, for example, to have IdentityHashMap semantics with WeakHashMap references.
Supports null value, which may allow null keys in maps that otherwise do not support null keys.

Author:

AO Industries, Inc.

Field Summary

Fields
Modifier and Type Field Description

static IdentityKey<?> NULL

Constructor Summary

Constructors
Constructor Description

IdentityKey(T value)
Deprecated.
Please use of(java.lang.Object), which may return NULL for null values.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`equals(Object obj)`
`T`	`getValue()`
`int`	`hashCode()`
`static <T> IdentityKey<T>`	`of(T value)`	Gets the identity key for the given value or `NULL` for a `null` value.
`static <T> IdentityKey<T>`	`ofNull()`	Gets the identity key that represents `null`.
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - NULL
```
public static final IdentityKey<?> NULL
```
- Constructor Detail
  - IdentityKey
```
@Deprecated
public IdentityKey(T value)
```
    Deprecated.
    Please use of(java.lang.Object), which may return NULL for null values.
- Method Detail
  - ofNull
```
public static <T> IdentityKey<T> ofNull()
```
    Gets the identity key that represents null.
  - of
```
public static <T> IdentityKey<T> of(T value)
```
    Gets the identity key for the given value or NULL for a null value.
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
    
    See Also:
    
    System.identityHashCode(java.lang.Object)
  - equals
```
public boolean equals(Object obj)
```
    Overrides:
    
    equals in class Object
  - getValue
```
public T getValue()
```