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Hashtable clear() Method in Java

Last Updated : 02 Jun, 2023
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The java.util.Hashtable.clear() method in Java is used to clear and remove all of the keys from a specified Hashtable. 

Syntax:

Hash_table.clear()

Parameters: The method does not accept any parameters. 

Return Value: The method does not return any value. Below programs are used to illustrate the working of java.util.Hashtable.clear() Method: 

Program 1: 

Java 
// Java code to illustrate the clear() 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 Values into 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("The Hashtable is: " + hash_table);  // Clearing the hash table using clear()  hash_table.clear();  // Displaying the final Hashtable  System.out.println("Finally the table looks like this: " + hash_table);  } }
Output:
The Hashtable is: {10=Geeks, 20=Geeks, 30=You, 15=4, 25=Welcomes} Finally the table looks like this: {}

Program 2: 

Java 
// Java code to illustrate the clear() 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 Values into 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("The Hashtable is: " + hash_table);  // Clearing the hash table using clear()  hash_table.clear();  // Displaying the final Hashtable  System.out.println("Finally the table looks like this: " + hash_table);  } }
Output:
The Hashtable is: {You=30, Welcomes=25, 4=15, Geeks=20} Finally the table looks like this: {}

Note: The same operation can be performed with any type of variation and combination of different data types.


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