Map put() Method in Java with Examples

Difficulty Level : Basic
Last Updated : 02 Jan, 2019

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

Syntax:

V put(K key,
    V value)

Parameters: This method has two arguments, key and value where key is the left argument and value is the corresponding value of the key in the map.

Returns: This method returns returns previous value associated with the key if present, else return -1.

Below programs show the implementation of int put() method.

Program 1:

// Java code to show the implementation of
// put method in Map interface
import java.util.*;
public class GfG {
  
    // Driver code
    public static void main(String[] args)
    {
  
        // Initializing a Map of type HashMap
        Map<Integer, String> map = new HashMap<>();
        map.put(1, "One");
        map.put(3, "Three");
        map.put(5, "Five");
        map.put(7, "Seven");
        map.put(9, "Ninde");
        System.out.println(map);
    }
}

Output:

{1=One, 3=Three, 5=Five, 7=Seven, 9=Ninde}

Program 2: Below is the code to show implementation of put().

// Java code to show the implementation of
// put method in Map interface
import java.util.*;
public class GfG {
  
    // Driver code
    public static void main(String[] args)
    {
  
        // Initializing a Map of type HashMap
        Map<String, String> map = new HashMap<>();
        map.put("1", "One");
        map.put("3", "Three");
        map.put("5", "Five");
        map.put("7", "Seven");
        map.put("9", "Ninde");
        System.out.println(map);
    }
}

Output:

{1=One, 3=Three, 5=Five, 7=Seven, 9=Ninde}

Reference:
Oracle Docs

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