The size() Method of Dictionary class in Java is used to know the size of the dictionary or the number of distinct keys present in the dictionary.
Syntax:
DICTIONARY.size()
Parameters:
The method does not accept any parameters.
Return Value:
The method returns the number of keys present in the dictionary.
Below programs illustrate the size() Method of Dictionary:
Program 1:
// Java Code to illustrate size() import java.util.*;
public class Dictionary_Demo {
public static void main(String args[])
{
// Creating a dictionary of Hashtable
Dictionary<Integer, String> dict
= new Hashtable<Integer, String>();
// Inserting elements into the Dictionary
dict.put( 10 , "Geeks" );
dict.put( 15 , "4" );
dict.put( 10 , "Geeks" );
dict.put( 25 , "Welcomes" );
dict.put( 30 , "You" );
// Displaying the Dictionary
System.out.println( "Dictionary: " + dict);
// Displaying the size of the dictionary
System.out.println( "The size of the dictionary is "
+ dict.size());
}
} |
Output:
Dictionary: {10=Geeks, 30=You, 15=4, 25=Welcomes} The size of the dictionary is 4
Program 2:
// Java Code to illustrate size() import java.util.*;
public class Dictionary_Demo {
public static void main(String args[])
{
// Creating a dictionary of Hashtable
Dictionary<String, Integer> dict
= new Hashtable<String, Integer>();
// Inserting elements into the table
dict.put( "Geek" , 10 );
dict.put( "4" , 15 );
dict.put( "Geeks" , 20 );
dict.put( "Welcomes" , 25 );
dict.put( "You" , 30 );
// Displaying the Dictionary
System.out.println( "Dictionary: " + dict);
// Displaying the size of the dictionary
System.out.println( "The size of the dictionary is "
+ dict.size());
}
} |
Output:
Dictionary: {You=30, Welcomes=25, 4=15, Geeks=20, Geek=10} The size of the dictionary is 5