Download Science Dictionary For Java Mobile

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Dictionary is an abstract class that represents a key/value storage repository and operates much like Map.

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Given a key and value, you can store the value in a Dictionary object. Once the value is stored, you can retrieve it by using its key. Thus, like a map, a dictionary can be thought of as a list of key/value pairs.

The abstract methods defined by Dictionary are listed below −

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Sr.No.Method & Description
1

Enumeration elements( )

Returns an enumeration of the values contained in the dictionary.

2

Object get(Object key)

Returns the object that contains the value associated with the key. If the key is not in the dictionary, a null object is returned.

3

boolean isEmpty( )

Returns true if the dictionary is empty, and returns false if it contains at least one key.

4

Enumeration keys( )

Returns an enumeration of the keys contained in the dictionary.

5

Object put(Object key, Object value)

Inserts a key and its value into the dictionary. Returns null if the key is not already in the dictionary; returns the previous value associated with the key if the key is already in the dictionary.

6

Object remove(Object key)

Removes the key and its value. Returns the value associated with the key. If the key is not in the dictionary, a null is returned.

7

int size( )

Returns the number of entries in the dictionary.

The Dictionary class is obsolete. You should implement the Map interface to obtain key/value storage functionality.

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  • Class

Class Dictionary<K,V>

    • java.util.Dictionary<K,V>
  • Direct Known Subclasses:
    Hashtable

    The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values. Every key and every value is an object. In any one Dictionary object, every key is associated with at most one value. Given a Dictionary and a key, the associated element can be looked up. Any non-null object can be used as a key and as a value.

    As a rule, the equals method should be used by implementations of this class to decide if two keys are the same.

    NOTE: This class is obsolete. New implementations should implement the Map interface, rather than extending this class.

    Since:
    JDK1.0
    See Also:
    Map, Object.equals(java.lang.Object), Object.hashCode(), Hashtable
    • Constructor Summary

      Constructors
      Constructor and Description
      Dictionary()
    • Method Summary

      Methods
      Modifier and TypeMethod and Description
      abstract Enumeration<V>elements()
      Returns an enumeration of the values in this dictionary.
      abstract Vget(Object key)
      Returns the value to which the key is mapped in this dictionary.
      abstract booleanisEmpty()
      abstract Enumeration<K>keys()
      Returns an enumeration of the keys in this dictionary.
      abstract Vput(K key, V value)
      Maps the specified key to the specified value in this dictionary.
      abstract Vremove(Object key)
      Removes the key (and its corresponding value) from this dictionary.
      abstract intsize()
      Returns the number of entries (distinct keys) in this dictionary.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Constructor Detail

      • Dictionary

        Sole constructor. (For invocation by subclass constructors, typically implicit.)
    • Method Detail

      • size

        Returns the number of entries (distinct keys) in this dictionary.
        Returns:
        the number of keys in this dictionary.
      • isEmpty

        Tests if this dictionary maps no keys to value. The general contract for the isEmpty method is that the result is true if and only if this dictionary contains no entries.
        Returns:
        true if this dictionary maps no keys to values; false otherwise.
      • keys

        Returns an enumeration of the keys in this dictionary. The general contract for the keys method is that an Enumeration object is returned that will generate all the keys for which this dictionary contains entries.
        Returns:
        an enumeration of the keys in this dictionary.
        See Also:
        elements(), Enumeration
      • elements

        Returns an enumeration of the values in this dictionary. The general contract for the elements method is that an Enumeration is returned that will generate all the elements contained in entries in this dictionary.
        Returns:
        an enumeration of the values in this dictionary.
        See Also:
        keys(), Enumeration
      • get

        Returns the value to which the key is mapped in this dictionary. The general contract for the isEmpty method is that if this dictionary contains an entry for the specified key, the associated value is returned; otherwise, null is returned.
        Parameters:
        key - a key in this dictionary. null if the key is not mapped to any value in this dictionary.
        Returns:
        the value to which the key is mapped in this dictionary;
        Throws:
        NullPointerException - if the key is null.
        See Also:
        put(java.lang.Object, java.lang.Object)
      • put

        Maps the specified key to the specified value in this dictionary. Neither the key nor the value can be null.

        If this dictionary already contains an entry for the specified key, the value already in this dictionary for that key is returned, after modifying the entry to contain the new element.

        If this dictionary does not already have an entry for the specified key, an entry is created for the specified key and value, and null is returned.

        The value can be retrieved by calling the get method with a key that is equal to the original key.

        Parameters:
        key - the hashtable key.
        value - the value.
        Returns:
        the previous value to which the key was mapped in this dictionary, or null if the key did not have a previous mapping.
        Throws:
        NullPointerException - if the key or value is null.
        See Also:
        Object.equals(java.lang.Object), get(java.lang.Object)
      • remove

        Removes the key (and its corresponding value) from this dictionary. This method does nothing if the key is not in this dictionary.
        Parameters:
        key - the key that needs to be removed.
        Returns:
        the value to which the key had been mapped in this dictionary, or null if the key did not have a mapping.
        Throws:
        NullPointerException - if key is null.
Download Science Dictionary For Java Mobile
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