获取树映射的大小

 

import java.util.TreeMap;
/* 
*来 自
 nowjava.com - 时代Java
*/

 

public class Main {

 

  public static void main(String[] args) {

   

    TreeMap treeMap = new TreeMap();

   

    System.out.println("Size of TreeMap : " + treeMap.size());

   

    //add key value pairs to TreeMap using put method

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

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

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

    System.out.println("Size of TreeMap after addition : " + treeMap.size());
    /*
    时   代     Java  公  众  号 - nowjava.com 提供
    */