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Oracle® Coherence Java API Reference
v3.5.3
E15583-01
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## com.tangosol.util
Class NullImplementation.NullMap

    java.lang.Object
      java.util.AbstractMap
          com.tangosol.util.NullImplementation.NullMap

All Implemented Interfaces:
  ExternalizableLite, PortableObject, java.io.Serializable, java.util.Map

Direct Known Subclasses:
  NullImplementation.NullObservableMap

Enclosing class:
  NullImplementation

    public static class NullImplementation.NullMap

extends java.util.AbstractMap
implements java.util.Map, java.io.Serializable, ExternalizableLite, PortableObject

A Map that contains nothing and does nothing.

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map
`java.util.Map.Entry`

Field Summary
`static java.util.Map` | `INSTANCE` Since the Map contains no information, only one ever has to exist.

Constructor Summary
`NullImplementation.NullMap()` Default constructor (for ExternalizableLite and PortableObject).

Method Summary
`boolean` | `containsKey(java.lang.Object key)`
`boolean` | `containsValue(java.lang.Object value)`
`java.util.Set` | `entrySet()`
`boolean` | `equals(java.lang.Object o)`
`java.lang.Object` | `get(java.lang.Object key)`
`int` | `hashCode()`
`java.util.Set` | `keySet()`
`java.lang.Object` | `put(java.lang.Object key, java.lang.Object value)`
`void` | `putAll(java.util.Map map)`
`void` | `readExternal(java.io.DataInput in)` Restore the contents of this object by loading the object's state from the passed DataInput object.
`void` | `readExternal(PofReader in)` Restore the contents of a user type instance by reading its state using the specified PofReader object.
`java.lang.Object` | `remove(java.lang.Object key)`
`int` | `size()`
`java.util.Collection` | `values()`
`void` | `writeExternal(java.io.DataOutput out)` Save the contents of this object by storing the object's state into the passed DataOutput object.
`void` | `writeExternal(PofWriter out)` Save the contents of a POF user type instance by writing its state using the specified PofWriter object.

Methods inherited from class java.util.AbstractMap
`clear, clone, isEmpty, toString`

Methods inherited from interface java.util.Map
`clear, isEmpty`

Field Detail

### INSTANCE

    public static final java.util.Map INSTANCE

  Since the Map contains no information, only one ever has to exist.

Constructor Detail

### NullImplementation.NullMap

    public NullImplementation.NullMap()

  Default constructor (for ExternalizableLite and PortableObject).

Method Detail

### size

    public int size()

  Specified by:
    `size` in interface `java.util.Map`
  Overrides:
    `size` in class `java.util.AbstractMap`

### get

    public java.lang.Object get(java.lang.Object key)

  Specified by:
    `get` in interface `java.util.Map`
  Overrides:
    `get` in class `java.util.AbstractMap`

### put

    public java.lang.Object put(java.lang.Object key,
                                java.lang.Object value)

  Specified by:
    `put` in interface `java.util.Map`
  Overrides:
    `put` in class `java.util.AbstractMap`

### putAll

    public void putAll(java.util.Map map)

  Specified by:
    `putAll` in interface `java.util.Map`
  Overrides:
    `putAll` in class `java.util.AbstractMap`

### remove

    public java.lang.Object remove(java.lang.Object key)

  Specified by:
    `remove` in interface `java.util.Map`
  Overrides:
    `remove` in class `java.util.AbstractMap`

### containsKey

    public boolean containsKey(java.lang.Object key)

  Specified by:
    `containsKey` in interface `java.util.Map`
  Overrides:
    `containsKey` in class `java.util.AbstractMap`

### containsValue

    public boolean containsValue(java.lang.Object value)

  Specified by:
    `containsValue` in interface `java.util.Map`
  Overrides:
    `containsValue` in class `java.util.AbstractMap`

### entrySet

    public java.util.Set entrySet()

  Specified by:
    `entrySet` in interface `java.util.Map`
  Specified by:
    `entrySet` in class `java.util.AbstractMap`

### keySet

    public java.util.Set keySet()

  Specified by:
    `keySet` in interface `java.util.Map`
  Overrides:
    `keySet` in class `java.util.AbstractMap`

### values

    public java.util.Collection values()

  Specified by:
    `values` in interface `java.util.Map`
  Overrides:
    `values` in class `java.util.AbstractMap`

### equals

    public boolean equals(java.lang.Object o)

  Specified by:
    `equals` in interface `java.util.Map`
  Overrides:
    `equals` in class `java.util.AbstractMap`

### hashCode

    public int hashCode()

  Specified by:
    `hashCode` in interface `java.util.Map`
  Overrides:
    `hashCode` in class `java.util.AbstractMap`

### readExternal

    public void readExternal(java.io.DataInput in)
                      throws java.io.IOException

  Restore the contents of this object by loading the object's state from the passed DataInput object.

  Specified by:
    `readExternal` in interface `ExternalizableLite`
  Parameters:
    `in` - the DataInput stream to read data from in order to restore the state of this object
  Throws:
    `java.io.IOException` - if an I/O exception occurs
    `java.io.NotActiveException` - if the object is not in its initial state, and therefore cannot be deserialized into

### writeExternal

    public void writeExternal(java.io.DataOutput out)
                       throws java.io.IOException

  Save the contents of this object by storing the object's state into the passed DataOutput object.

  Specified by:
    `writeExternal` in interface `ExternalizableLite`
  Parameters:
    `out` - the DataOutput stream to write the state of this object to
  Throws:
    `java.io.IOException` - if an I/O exception occurs

### readExternal

    public void readExternal(PofReader in)
                      throws java.io.IOException

  Restore the contents of a user type instance by reading its state using the specified PofReader object.

  Specified by:
    `readExternal` in interface `PortableObject`
  Parameters:
    `in` - the PofReader from which to read the object's state
  Throws:
    `java.io.IOException` - if an I/O error occurs

### writeExternal

    public void writeExternal(PofWriter out)
                       throws java.io.IOException

  Save the contents of a POF user type instance by writing its state using the specified PofWriter object.

  Specified by:
    `writeExternal` in interface `PortableObject`
  Parameters:
    `out` - the PofWriter to which to write the object's state
  Throws:
    `java.io.IOException` - if an I/O error occurs

Overview | Package | Class | Tree | Index | Help

Oracle® Coherence Java API Reference
v3.5.3
E15583-01
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

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