How to Add Key-Value pairs to LinkedHashMap in Java? Last Updated : 22 Dec, 2020 Comments Improve Suggest changes Like Article Like Report LinkedHashMap is a Hash table and linked list implementation of the Map interface. In LinkedHashMap order of key-value pair depends on the order in which keys were inserted into the map. Insertion order does not affect if a key is reinserted into the map. Example: Input: Key: 1 Value : 1221 Key: 2 Value : 2112 Output: Keys : [1,2] Values : [1221,2112] Key-Value pairs : [1=1221, 2=2112] Methods Use: put(Key, Value): First parameter as key and second parameter as Value.keySet(): Creates a set out of the key elements contained in the hash map.values(): Create a set out of the values in the hash map. Approach: Create two-variable named as Key and ValueAccept the input from user in Key and in ValueUse put() method to add Key-Value pair inside the LinkedHashMap Below is the implementation of the above approach: Java // Java Program to add key-value // pairs to LinkedHashMap import java.util.*; public class Main { public static void main(String[] args) { // create an instance of LinkedHashMap LinkedHashMap<Integer, Integer> map = new LinkedHashMap<Integer, Integer>(); int num, key, val; num = 2; for (int i = 0; i < num; i++) { // Taking inputs from user key = i + 1; val = key * 10; // Add mappings using put method map.put(key, val); } // Displaying key System.out.println("Keys: " + map.keySet()); // Displaying value System.out.println("Values: " + map.values()); // Displaying key-value pair System.out.println("Key-Value pairs: " + map.entrySet()); } } OutputKeys: [1, 2] Values: [10, 20] Key-Value pairs: [1=10, 2=20] Time Complexity: O(1) Comment More infoAdvertise with us Next Article How to Add Key-Value pairs to LinkedHashMap in Java? rbbansal Follow Improve Article Tags : Java Java Programs Java-LinkedHashMap Practice Tags : Java Similar Reads How to Convert all LinkedHashMap Values to a List in Java? 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