java.util.Hashtable.putAll() Method


Advertisements


Description

The putAll(Map<? extends K,? extends V> t) method is used to copy all of the mappings from the specified Map to this Hashtable.

Declaration

Following is the declaration for java.util.Hashtable.putAll() method.

public void putAll(Map<? extends K,? extends V> t)

Parameters

  • t -- This is the mappings to be stored in this map.

Return Value

  • NA

Exception

  • NullPointerException -- This is thrown if the specified map is null.

Example

The following example shows the usage of java.util.Hashtable.putAll()

package com.tutorialspoint;

import java.util.*;

public class HashTableDemo {
   public static void main(String args[]) {
   // create hash table 
   Hashtable htable1 = new Hashtable(); 
      
   // create Map
   Map map=new HashMap();
      
   // put values in map
   map.put("1","TP");
   map.put("2","IS");
   map.put("3","BEST");
          
   System.out.println("Initial hash table value: "+htable1);
   System.out.println("Map values: "+map);
      
   // put map values in table
   htable1.putAll(map);
   System.out.println("Hash table value after put all: "+htable1);
   }    
}

Let us compile and run the above program, this will produce the following result.

Initial hash table value: {}
Map values: {3=BEST, 2=IS, 1=TP}
Hash table value after put all: {3=BEST, 2=IS, 1=TP}

java_util_hashtable.htm

Advertisements