홍대 자바 수업 핵심 buffer reader,스트링 토크나이저

import java.util.*;
import java.io.*;

class  StringTest
{
	public static void main(String[] args) throws Exception

	{
		StringBuffer a=new StringBuffer();


		BufferedReader scan01=new	BufferedReader(new InputStreamReader(System.in));	
		String st = scan01.readLine();
		
		System.out.println(st);

		a.append(st);
		StringTokenizer str=new StringTokenizer(st," ");
		int count=str.countTokens();
		System.out.println(count);
		System.out.println(a.reverse());
	}
}