Java Hashmap Add Key And Value

Chapter: Data Structures Last Updated: 25-03-2017 07:03:55 UTC

Program:

            /* ............... START ............... */
                
import java.util.HashMap;
import java.util.Map.Entry;
import java.util.Set;

public class JavaHashMapKeyValue {

	public static void main(String[] args) {
		// Creating HashMap with default initial capacity and load factor

		HashMap<String, Integer> map = new HashMap<String, Integer>();

		// Inserting key-value pairs to map using put() method

		map.put("ONE", 1);

		map.put("TWO", 2);

		map.put("THREE", 3);

		map.put("FOUR", 4);

		map.put("FIVE", 5);

		// Printing key-value pairs

		Set<Entry<String, Integer>> entrySet = map.entrySet();

		for (Entry<String, Integer> entry : entrySet) {
			System.out.println(entry.getKey() + " : " + entry.getValue());
		}

		System.out.println("-------------------------");

		// Creating another HashMap

		HashMap<String, Integer> anotherMap = new HashMap<String, Integer>();

		// Inserting key-value pairs to anotherMap using put() method

		anotherMap.put("SIX", 6);

		anotherMap.put("SEVEN", 7);

		// Inserting key-value pairs of map to anotherMap using putAll() method

		anotherMap.putAll(map);

		// Printing key-value pairs of anotherMap

		entrySet = anotherMap.entrySet();

		for (Entry<String, Integer> entry : entrySet) {
			System.out.println(entry.getKey() + " : " + entry.getValue());
		}
	}
}
                /* ............... END ............... */
        

Output

FIVE : 5
ONE : 1
FOUR : 4
TWO : 2
THREE : 3
-------------------------
FIVE : 5
SIX : 6
ONE : 1
FOUR : 4
TWO : 2
SEVEN : 7
THREE : 3

Tags

Hashmap Add Key And Value, Java, Data Structure

Similar Programs Chapter Last Updated
HashMap Implementation In Java Data Structures 07-07-2018
Linked List Implementation In Java Data Structures 09-03-2018
Queue Implementation In Java Data Structures 22-09-2018
Stack Implementation In Java Data Structures 22-09-2018
Binary Search Tree Java Data Structures 11-02-2018
Insertion Sort In Java Data Structures 10-02-2018
Java Stack Example Data Structures 16-10-2017
Java String Array Sort Data Structures 31-03-2017
Java Binary Tree Vertical Sum Data Structures 11-11-2016
Java Binary Tree Boundary Traversal Data Structures 11-11-2016
Java Binary Tree Lowest Common Ancestor (LCA) Data Structures 11-11-2016
Java Binary Tree Maximum Element Data Structures 11-11-2016
Java Three Dimensional Array Data Structures 28-10-2016
Java Infix Expression To Postfix Expression Data Structures 25-10-2016
Java Linked List Add Element First And Last Data Structures 24-10-2016
Java Maximum Element From Vector Data Structures 24-10-2016
Java Binary Search On Vector Data Structures 24-10-2016
Java Get Elements Of LinkedList Data Structures 23-10-2016
Java Linked List Update Element Data Structures 23-10-2016
Java Delete Elements From LinkedList Data Structures 23-10-2016
Java Double Ended Queue Data Structures 09-10-2016
Java Dynamic Queue Using Array Data Structures 26-09-2018
Java Queue Array Based Implementation Data Structures 07-10-2016
Java Sort Short Array Data Structures 25-09-2016
Java Sort Long Array Data Structures 25-09-2016
Java Sort Int Array Data Structures 19-09-2016
Java Sort Float Array Data Structures 19-09-2016
Java Sort Double Array Data Structures 19-09-2016
Java Sort Char Array Data Structures 19-09-2016
Java Sort Byte Array Data Structures 19-09-2016

1 2 3