Hashtable get() Method in Java
Last Updated :
28 Jun, 2018
The java.util.Hashtable.get() method of Hashtable class is used to retrieve or fetch the value mapped by a particular key mentioned in the parameter. It returns NULL when the table contains no such mapping for the key.
Syntax:
Hash_Table.get(Object key_element)
Parameter: 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 illustrates the working of java.util.Hashtable.get() method:
Program 1:
import java.util.*;
public class Hash_Table_Demo {
public static void main(String[] args)
{
Hashtable<Integer, String> hash_table =
new Hashtable<Integer, String>();
hash_table.put( 10 , "Geeks" );
hash_table.put( 15 , "4" );
hash_table.put( 20 , "Geeks" );
hash_table.put( 25 , "Welcomes" );
hash_table.put( 30 , "You" );
System.out.println( "Initial Table is: " + hash_table);
System.out.println( "The Value is: " + hash_table.get( 25 ));
System.out.println( "The Value is: " + hash_table.get( 10 ));
}
}
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Output:
Initial Table is: {10=Geeks, 20=Geeks, 30=You, 15=4, 25=Welcomes}
The Value is: Welcomes
The Value is: Geeks
Program 2:
import java.util.*;
public class Hash_Table_Demo {
public static void main(String[] args)
{
Hashtable<String, Integer> hash_table =
new Hashtable<String, Integer>();
hash_table.put( "Geeks" , 10 );
hash_table.put( "4" , 15 );
hash_table.put( "Geeks" , 20 );
hash_table.put( "Welcomes" , 25 );
hash_table.put( "You" , 30 );
System.out.println( "Initial table is: " + hash_table);
System.out.println( "The Value is: " + hash_table.get( "Geeks" ));
System.out.println( "The Value is: " + hash_table.get( "You" ));
}
}
|
Output:
Initial table is: {You=30, Welcomes=25, 4=15, Geeks=20}
The Value is: 20
The Value is: 30
Note: The same operation can be performed with any type of variation and combination of different data types.
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