Java HashMap example explained below. HashMap is important concept used mostly in day to day real project programming.
HashMap Implements Map Interface.
Complete class can be found below;

package com.basic;

import java.util.HashMap;

public class HashmapClass {

	 * @param args
	public static void main(String[] args) {
		HashMap map = new HashMap<>();
		map.put("USA", "Washington");
		map.put("India", "Delhi");
		System.out.println("Capital city for India is:"+map.get("India"));
		System.out.println("Capital city for Nepal is:"+map.get("Nepal"));

Refer YouTube tutorial with detailed explanation

For official Java Docs refer
For further reading refer Java Programming Category posts.

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