获取Java树集的大小

import java.util.TreeSet;

 

public class Main {/* 来自 nowjava*/

 

  public static void main(String[] args) {

    TreeSet tSet = new TreeSet();

    System.out.println("Size of TreeSet : " + tSet.size());

   

    //add elements to TreeSet object

    tSet.add(new Integer("1"));

    tSet.add(new Integer("2"));

    tSet.add(new Integer("3"));

 

    System.out.println("Size of TreeSet after addition : " + tSet.size());

   

    //remove one element from TreeSet using remove method

    tSet.remove(new