How to create an Empty Map in Java - Step by Step Examples

◀ Previous Next ▶

How to create an Empty Map in Java ?

Answer

To create an empty map in Java, you can use the HashMap constructor. This creates a new, empty HashMap object.

✐ Examples

1 Creating an Empty Map

We can create an empty map in Java using the HashMap constructor, which initializes a map with no key-value pairs.

For example,

We start by importing the java.util.HashMap package, which provides the HashMap class needed to create a map.
We then declare a variable named emptyMap of type HashMap. This variable will hold our empty map.
We use the new HashMap<>() constructor to create a new, empty HashMap object. In Java, the HashMap constructor initializes the map with no key-value pairs.
The newly created map is now assigned to the emptyMap variable. In this example, the map has Integer keys and String values.
We can now perform various operations on this empty map, such as adding key-value pairs, checking for the presence of keys, and retrieving values.

Java Program

import java.util.HashMap;

public class Main {
    public static void main(String[] args) {
        // Declare an empty map
        HashMap<Integer, String> emptyMap = new HashMap<>();

        // Operations on the empty map
        // ...

        System.out.println(emptyMap);
    }
}

Output

{}

Summary

In this tutorial, we learned How to create an Empty Map in Java language with well detailed examples.