输入一字符串，统计其中有多少个单词（单词之间用空格分隔）

import java.util.*;
class Example3{
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();//这里的sc.nextLine（）空格也会记数；
        StringTokenizer st = new StringTokenizer(s," ");
        int numble = st.countTokens();
        while(st.hasMoreTokens())
        {
            String str = st.nextToken();
        }
        System.out.print(numble);
    }
}