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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.util 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   java.util.AbstractCollection
      java.util.AbstractSet

All known Subclasses:   java.util.TreeSet,  java.util.HashSet,
AbstractSet
abstract public class AbstractSet extends AbstractCollection implements Set(Code)
This class provides a skeletal implementation of the Set interface to minimize the effort required to implement this interface.

The process of implementing a set by extending this class is identical to that of implementing a Collection by extending AbstractCollection, except that all of the methods and constructors in subclasses of this class must obey the additional constraints imposed by the Set interface (for instance, the add method must not permit addition of multiple intances of an object to a set).

Note that this class does not override any of the implementations from the AbstractCollection class. It merely adds implementations for equals and hashCode.

This class is a member of the Java Collections Framework.
author:
   Josh Bloch
version:
   1.14, 02/02/00
See Also:   Collection
See Also:   AbstractCollection
See Also:   Set
since:
   1.2




Constructor Summary
protected  AbstractSet()
     Sole constructor.

Method Summary
public  booleanequals(Object o)
     Compares the specified object with this set for equality.
public  inthashCode()
     Returns the hash code value for this set.
public  booleanremoveAll(Collection c)
     Removes from this set all of its elements that are contained in the specified collection (optional operation).

This implementation determines which is the smaller of this set and the specified collection, by invoking the size method on each.



Constructor Detail
AbstractSet
protected AbstractSet()(Code)
Sole constructor. (For invocation by subclass constructors, typically implicit.)




Method Detail
equals
public boolean equals(Object o)(Code)
Compares the specified object with this set for equality. Returns true if the given object is also a set, the two sets have the same size, and every member of the given set is contained in this set. This ensures that the equals method works properly across different implementations of the Set interface.

This implementation first checks if the specified object is this set; if so it returns true. Then, it checks if the specified object is a set whose size is identical to the size of this set; if not, it it returns false. If so, it returns containsAll((Collection) o).
Parameters:
  o - Object to be compared for equality with this set. true if the specified object is equal to this set.




hashCode
public int hashCode()(Code)
Returns the hash code value for this set. The hash code of a set is defined to be the sum of the hash codes of the elements in the set. This ensures that s1.equals(s2) implies that s1.hashCode()==s2.hashCode() for any two sets s1 and s2, as required by the general contract of Object.hashCode.

This implementation enumerates over the set, calling the hashCode method on each element in the collection, and adding up the results. the hash code value for this set.




removeAll
public boolean removeAll(Collection c)(Code)
Removes from this set all of its elements that are contained in the specified collection (optional operation).

This implementation determines which is the smaller of this set and the specified collection, by invoking the size method on each. If this set has fewer elements, then the implementation iterates over this set, checking each element returned by the iterator in turn to see if it is contained in the specified collection. If it is so contained, it is removed from this set with the iterator's remove method. If the specified collection has fewer elements, then the implementation iterates over the specified collection, removing from this set each element returned by the iterator, using this set's remove method.

Note that this implementation will throw an UnsupportedOperationException if the iterator returned by the iterator method does not implement the remove method.
Parameters:
  c - elements to be removed from this set. true if this set changed as a result of the call.
throws:
  UnsupportedOperationException - removeAll is not supportedby this set.
throws:
  NullPointerException - if the specified collection is null.
See Also:   AbstractSet.remove(Object)
See Also:   AbstractSet.contains(Object)




Methods inherited from java.util.AbstractCollection
public boolean add(Object o)(Code)(Java Doc)
public boolean addAll(Collection c)(Code)(Java Doc)
public void clear()(Code)(Java Doc)
public boolean contains(Object o)(Code)(Java Doc)
public boolean containsAll(Collection c)(Code)(Java Doc)
public boolean isEmpty()(Code)(Java Doc)
abstract public Iterator iterator()(Code)(Java Doc)
public boolean remove(Object o)(Code)(Java Doc)
public boolean removeAll(Collection c)(Code)(Java Doc)
public boolean retainAll(Collection c)(Code)(Java Doc)
abstract public int size()(Code)(Java Doc)
public Object[] toArray()(Code)(Java Doc)
public Object[] toArray(Object a)(Code)(Java Doc)
public String toString()(Code)(Java Doc)

Methods inherited from java.lang.Object
public boolean equals(Object obj)(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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