IT. Expert System.

This method is used to associate the specified value with the specified key in this map.

Syntax:

Library: java.util.HashMap

public V put(K key, V value)

Example:

import java.util.*;

public class HashMapDemo {
   public static void main(String args[]) {
      // create hash map
      HashMap newmap = new HashMap();
      
      // populate hash map
      newmap.put(1, "tutorials");
      newmap.put(2, "point");
      newmap.put(3, "is best");
      
      System.out.println("Map value before change: "+ newmap);
      
      // put new values at key 3
      String prevvalue=(String)newmap.put(3,"is great");
      
      // check returned previous value
      System.out.println("Returned previous value: "+ prevvalue);
      
      System.out.println("Map value after change: "+ newmap);
   }    
}

Output:

Map value before change: {1=tutorials, 2=point, 3=is best}
Returned previous value: is best
Map value after change: {1=tutorials, 2=point, 3=is great}

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