IO流统计英文单词的问题

编写程序ListWords.java实现从键盘输入一个英文句子，统计该句子中英文单词的个数，
将找出所有单词存放到一个数组中。例如：He said,"Ths's not a good idea."则输出
为
共有8个单词：He said ths s not a good idea
这是本人自己写的可是不对，求帮看看

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
public class ListWords {
public static void main(String[] args) throws IOException {
    readkeyboard();

}
public static void readkeyboard() throws IOException {
    InputStreamReader str=new InputStreamReader(System.in);
    BufferedReader in=new BufferedReader(str);
     //优化代码
     int score = 0;
     String st=null;
     String[] temp=new String[10];
     while(!(st=in.readLine()).equals("quit")){
         temp = st.split(" ");
          score++;
     }  
     System.out.println("你输入的单词书为"+score+";"+temp);
}
}