Last Updated : 02 Jun, 2023
The java.util.Hashtable.size() method of Hashtable class is used to get the size of the table which refers to the number of the key-value pair or mappings in the Table.
Syntax:
Hash_Table.size()
Parameters: The method does not take any parameters.
Return Value: The method returns the size of the table which also means the number of key-value pairs present in the table. Below programs illustrates the working of java.util.Hashtable.size():
Program 1:
Java
// Java code to illustrate the size() method
import java.util.*;
public class Hash_Table_Demo {
public static void main(String[] args)
{
// Creating an empty Hashtable
Hashtable<Integer, String> hash_table =
new Hashtable<Integer, String>();
// Inserting elements into the table
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");
// Displaying the Hashtable
System.out.println("Initial table is: " + hash_table);
// Displaying the size of the table
System.out.println("The size of the table is " +
hash_table.size());
}
}
Output:
Initial table is: {10=Geeks, 20=Geeks, 30=You, 15=4, 25=Welcomes}
The size of the table is 5
Program 2:
Java
// Java code to illustrate the size() method
import java.util.*;
public class Hash_Table_Demo {
public static void main(String[] args)
{
// Creating an empty Hashtable
Hashtable<String, Integer> hash_table =
new Hashtable<String, Integer>();
// Inserting elements into the table
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);
// Displaying the Hashtable
System.out.println("Initial Table is: " + hash_table);
// Displaying the size of the table
System.out.println("The size of the table is " +
hash_table.size());
}
}
Output:
Initial Table is: {You=30, Welcomes=25, 4=15, Geeks=20}
The size of the table is 4
Note: The same operation can be performed with any type of variation and combination of different data types.
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