With this example we are going to demonstrate how to remove all mappings from a Hashtable, that means removing all key value pairs from the Hashtable. In short, to remove all mappings from a Hashtable you should:
- Create a new Hashtable.
- Populate the hashtable with elements, using
put(K key, V value)API method of Hashtable. - Invoke the
clear()API method of Hashtable. It removes all keys and their corresponding values from the hashtable, so that the Hashtable contains no keys.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core;
import java.util.Hashtable;
public class ClearHashtable {
public static void main(String[] args) {
// Create a Hashtable and populate it with elements
Hashtable hashtable = new Hashtable();
hashtable.put("key_1","value_1");
hashtable.put("key_2","value_2");
hashtable.put("key_3","value_3");
System.out.println("Hashtable contains : " + hashtable);
// void clear method() removes all mappings of Hashtable class
hashtable.clear();
System.out.println("Hashtable contains : " + hashtable);
}
}
Output:
Hashtable contains : {key_3=value_3, key_2=value_2, key_1=value_1}
Hashtable contains : {}
This was an example of how to remove all mappings from a Hashtable in Java.
