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java.util
Class Collections.EmptyList  

java.lang.Object
  java.util.AbstractCollection
      java.util.AbstractList
          java.util.Collections.EmptyList

All Implemented Interfaces:

Collection, java.lang.Iterable, List, RandomAccess, java.io.Serializable

Enclosing class:

Collections

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private static final class Collections.EmptyList

extends AbstractList

implements java.io.Serializable, RandomAccess

The implementation of Collections.EMPTY_LIST 55 . This class name is required for compatibility with Sun's JDK serializability.

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Nested Class Summary

 

Nested classes inherited from class java.util.AbstractList

 

Field Summary
private static long	serialVersionUID           Compatible with JDK 1.4.

 

Fields inherited from class java.util.AbstractList

modCount

 

Constructor Summary
(package private)	Collections.EmptyList()           A private constructor adds overhead.

 

Method Summary
boolean	contains(java.lang.Object o)           Never contains anything.
boolean	containsAll(Collection c)           This is true only if the given collection is also empty.
boolean	equals(java.lang.Object o)           Equal only if the other list is empty.
java.lang.Object	get(int index)           No matter the index, it is out of bounds.
int	hashCode()           The hashcode is always 1.
int	indexOf(java.lang.Object o)           Returns -1.
int	lastIndexOf(java.lang.Object o)           Returns -1.
boolean	remove(java.lang.Object o)           Always succeeds with false result.
boolean	removeAll(Collection c)           Always succeeds with false result.
boolean	retainAll(Collection c)           Always succeeds with false result.
int	size()           The size is always 0.
java.lang.Object[]	toArray()           The array is always empty.
java.lang.Object[]	toArray(java.lang.Object[] a)           We don't even need to use reflection!
java.lang.String	toString()           The string never changes.

 

Methods inherited from class java.util.AbstractList

add, add, addAll, clear, iterator, listIterator, listIterator, remove, removeRange, set, subList

 

Methods inherited from class java.util.AbstractCollection

addAll, equals, hashCode, isEmpty, removeAllInternal, retainAllInternal

 

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

 

Methods inherited from interface java.util.List

addAll, isEmpty

 

Field Detail

serialVersionUID

private static final long serialVersionUID

Compatible with JDK 1.4.

See Also:

Constant Field Values

Constructor Detail

Collections.EmptyList

Collections.EmptyList()

A private constructor adds overhead.

Method Detail

size

public int size()

The size is always 0.

Specified by:

size in interface List

Specified by:

size in class AbstractCollection

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get

public java.lang.Object get(int index)

No matter the index, it is out of bounds. This method never returns, throwing an exception instead.

Specified by:

get in interface List

Specified by:

get in class AbstractList

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contains

public boolean contains(java.lang.Object o)

Never contains anything.

Specified by:

contains in interface List

Overrides:

contains in class AbstractCollection

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containsAll

public boolean containsAll(Collection c)

This is true only if the given collection is also empty.

Specified by:

containsAll in interface List

Overrides:

containsAll in class AbstractCollection

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equals

public boolean equals(java.lang.Object o)

Equal only if the other list is empty.

Specified by:

equals in interface List

Overrides:

equals in class AbstractList

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hashCode

public int hashCode()

The hashcode is always 1.

Specified by:

hashCode in interface List

Overrides:

hashCode in class AbstractList

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indexOf

public int indexOf(java.lang.Object o)

Returns -1.

Specified by:

indexOf in interface List

Overrides:

indexOf in class AbstractList

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lastIndexOf

public int lastIndexOf(java.lang.Object o)

Returns -1.

Specified by:

lastIndexOf in interface List

Overrides:

lastIndexOf in class AbstractList

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remove

public boolean remove(java.lang.Object o)

Always succeeds with false result.

Specified by:

remove in interface List

Overrides:

remove in class AbstractCollection

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removeAll

public boolean removeAll(Collection c)

Always succeeds with false result.

Specified by:

removeAll in interface List

Overrides:

removeAll in class AbstractCollection

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retainAll

public boolean retainAll(Collection c)

Always succeeds with false result.

Specified by:

retainAll in interface List

Overrides:

retainAll in class AbstractCollection

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toArray

public java.lang.Object[] toArray()

The array is always empty.

Specified by:

toArray in interface List

Overrides:

toArray in class AbstractCollection

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toArray

public java.lang.Object[] toArray(java.lang.Object[] a)

We don't even need to use reflection!

Specified by:

toArray in interface List

Overrides:

toArray in class AbstractCollection

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toString

public java.lang.String toString()

The string never changes.

Overrides:

toString in class AbstractCollection

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Home >> All >> java >> [ util overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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