package com.google;

import javax.lang.model.element.NestingKind;

import java.util.HashMap;

public class IntegerDemo {

    public static void main(String[] args) {

        HashMap hashMap = new HashMap();

        hashMap.put("name","123");

        hashMap.put("name","1234567");

        hashMap.put("name",null);

        hashMap.put("name","123");

        System.out.println(hashMap.size());// 1

        System.out.println(hashMap.get("name"));//123

    }

}