IT. Expert System.

The putAll(Map m) method is used to copy all of the mappings from the specified map to this map.

Syntax:

public void putAll(Map m)

Example:

package com.technicia;

import java.util.*;

public class HashMapDemo {
   public static void main(String args[]) {
      // create two hash maps
      HashMap newmap1 = new HashMap();
      HashMap newmap2 = new HashMap();
      
      // populate hash map
      newmap1.put(1, "tutorials");
      newmap1.put(2, "point");
      newmap1.put(3, "is best");
      
      System.out.println("Values in newmap1: "+ newmap1);
      
      // put all values in newmap2
      newmap2.putAll(newmap1);

      System.out.println("Values in newmap2: "+ newmap2);
   }    

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