Map put() Method in Java with Examples

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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