How to Check If HashMap Contains Specified Key in Java

The example aims to check if a HashMap object contains a particular key by containsKey method in Java.

Source Code

package com.beginner.examples;

import java.util.HashMap;

public class CheckHashMapContainsKeyExample {

	public static void main(String[] args) {
		// Create a HashMap object
		HashMap map = new HashMap();

		// Put Key-value
		map.put("1", "Jan");
		map.put("2", "Feb");
		map.put("3", "Mar");
		map.put("4", "Apr");
		map.put("5", "May");

		// The return value of this method is of a Boolean type
		//Returns true if it contains this key,or false if it does not
		boolean b = map.containsKey("3");
		boolean b1 = map.containsKey("6");

		System.out.println("Key 3:" + b + "nKey 6:" + b1);

	}

}

Output:

Key 3:true
Key 6:false

References

Imported packages in Java documentation:

HashMap