The get() method of Dictionary class is used to retrieve or fetch the value mapped by a particular key mentioned in the parameter. It returns NULL when the dictionary contains no such mapping for the key.
Syntax:
DICTIONARY.get(Object key_element)
Parameters: The method takes one parameter key_element of object type and refers to the key whose associated value is supposed to be fetched.
Return Value: The method returns the value associated with the key_element in the parameter.
Below programs are used to illustrate the working of java.util.Dictionary.get() Method:
Program 1:
// Java code to illustrate the get() method import java.util.*;
public class Dictionary_Demo {
public static void main(String[] args)
{
// Creating an empty Dictionary
Dictionary<Integer, String> dict
= new Hashtable<Integer, String>();
// Inserting the values into dictionary
dict.put( 10 , "Geeks" );
dict.put( 15 , "4" );
dict.put( 20 , "Geeks" );
dict.put( 25 , "Welcomes" );
dict.put( 30 , "You" );
// Displaying the Dictionary
System.out.println( "Initial Dictionary is: " + dict);
// Getting the value of 25
System.out.println( "The Value is: " + dict.get( 25 ));
// Getting the value of 10
System.out.println( "The Value is: " + dict.get( 10 ));
}
} |
Output:
Initial Dictionary is: {10=Geeks, 20=Geeks, 30=You, 15=4, 25=Welcomes} The Value is: Welcomes The Value is: Geeks
Program 2:
// Java code to illustrate the get() method import java.util.*;
public class Dictionary_Demo {
public static void main(String[] args)
{
// Creating an empty Dictionary
Dictionary<String, Integer> dict
= new Hashtable<String, Integer>();
// Inserting the values into dictionary
dict.put( "Geeks" , 10 );
dict.put( "4" , 15 );
dict.put( "Geeks" , 20 );
dict.put( "Welcomes" , 25 );
dict.put( "You" , 30 );
// Displaying the Dictionary
System.out.println( "Initial Dictionary is: "
+ dict);
// Getting the value of 25
System.out.println( "The Value is: "
+ dict.get( "Geeks" ));
// Getting the value of 10
System.out.println( "The Value is: "
+ dict.get( 20 ));
}
} |
Output:
Initial Dictionary is: {You=30, Welcomes=25, 4=15, Geeks=20} The Value is: 20 The Value is: null