SortedMap putAll() method in Java with Examples

Last Updated : 12 Jul, 2025

The putAll() method of SortedMap interface in Java is used to copy all of the mappings from the specified SortedMap to this SortedMap.

Syntax:  

void putAll(Map m)

Parameters: This method has the only argument map m which contains key-value mappings to be copied to given SortedMap.

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

Note: The putAll() method in SortedMap is inherited from the Map interface in Java.

Below programs illustrate the implementation of int putAll() method:

Program 1:  

Java 
// Java code to show the implementation of
// putAll method in SortedMap interface

import java.util.*;

public class GfG {

    // Driver code
    public static void main(String[] args)
    {

        // Initializing a SortedMap
        SortedMap<Integer, String> map
            = new TreeMap<>();

        map.put(1, "One");
        map.put(3, "Three");
        map.put(5, "Five");
        map.put(7, "Seven");
        map.put(9, "Nine");
        System.out.println(map);

        SortedMap<Integer, String> mp
            = new TreeMap<>();

        mp.put(10, "Ten");
        mp.put(30, "Thirty");
        mp.put(50, "Fifty");

        map.putAll(mp);

        System.out.println(map);
    }
}

Output: 
{1=One, 3=Three, 5=Five, 7=Seven, 9=Nine}
{1=One, 3=Three, 5=Five, 7=Seven, 9=Nine, 10=Ten, 30=Thirty, 50=Fifty}

 

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

Java 
// Java code to show the implementation of
// putAll method in SortedMap interface

import java.util.*;
public class GfG {

    // Driver code
    public static void main(String[] args)
    {

        // Initializing a SortedMap
        SortedMap<String, String> map
            = new TreeMap<>();

        map.put("1", "One");
        map.put("3", "Three");
        map.put("5", "Five");
        map.put("7", "Seven");
        map.put("9", "Nine");
        System.out.println(map);

        SortedMap<String, String> mp
            = new TreeMap<>();

        mp.put("10", "Ten");
        mp.put("30", "Thirty");
        mp.put("50", "Fifty");

        map.putAll(mp);

        System.out.println(map);
    }
}

Output: 
{1=One, 3=Three, 5=Five, 7=Seven, 9=Nine}
{1=One, 10=Ten, 3=Three, 30=Thirty, 5=Five, 50=Fifty, 7=Seven, 9=Nine}

 

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Map.html#put(K, %20V)
 

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