获取HashMap的大小

import java.util.HashMap;
/**
n o w  j a v a  . c o m
**/

 

public class Main {

 

  public static void main(String[] args) {

    HashMap hMap = new HashMap();

   

    System.out.println("Size of HashMap : " + hMap.size());

   

    //add key value pairs to HashMap using put method

    hMap.put("1","One");

    hMap.put("2","Two");

    hMap.put("3","Three");

    System.out.println("Size of HashMap after addition : " + hMap.size());

   

    //remove one element from HashMap using remove method

    Object obj = hMap.remove(