Hashtable clear() Method in Java
Last Updated :
02 Jun, 2023
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
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("The Hashtable is: " + hash_table);
hash_table.clear();
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
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("The Hashtable is: " + hash_table);
hash_table.clear();
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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