Write a Java program to check whether a map contains key-value mappings (empty) or not

This is a Java program that demonstrates how to check if a HashMap is empty or not. Here's how it works:

First, a HashMap object is created using the HashMap class. This HashMap will be used to store integer keys and string values.
Key-value pairs are added to the HashMap using the put() method.
The isEmpty() method is used to check if the HashMap is empty or not. The result is stored in a boolean variable, res.
The contents of the boolean variable res are printed to the console using the println() method.
The clear() method is used to remove all elements from the HashMap.
The isEmpty() method is used again to check if the HashMap is empty or not. The result is stored in the same boolean variable, res.
The contents of the boolean variable res are printed to the console again using the println() method.

Source Code

import java.util.*;  
public class Check_EmptyNot
{  
	public static void main(String args[])
	{
		HashMap <Integer,String> hash_map = new HashMap <Integer,String> ();
		hash_map.put(1, "Pink");
		hash_map.put(2, "Green");
		hash_map.put(3, "Red");
		hash_map.put(4, "White");
		hash_map.put(5, "Blue");
		hash_map.put(6, "Black");
		hash_map.put(7, "Orange");	
 
		boolean res = hash_map.isEmpty();
 
		System.out.println("Is Hashmap Empty : " + res);
		hash_map.clear();
 
		res = hash_map.isEmpty();// check if map is empty
 
		System.out.println("Is Hashmap Empty : " + res);
	}
}

Output

Is Hashmap Empty : false
Is Hashmap Empty : true

Write a Java program to check whether a map contains key-value mappings (empty) or not

Source Code

Output

Example Programs

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