자바에서 문자열 토큰 중

package project;
 
import java.io.*;
import java.util.StringTokenizer;
 
public class Main {
    public static void main(String [] argv) throws IOException {
 
        //read        
        File input = new File("input.txt");
        FileReader fr = new FileReader(input);        
        BufferedReader br = new BufferedReader(fr);
 
        //write
        File output = new File("output.txt");
        FileWriter fw =  new FileWriter(output);
        BufferedWriter bw = new BufferedWriter(fw);
 
 
		String text = "";
        while(true) {
            String str = br.readLine();
            if(str == null) {
                break;
            }
			text += str;
            System.out.println("파일에서 읽은 데이터 : ");
            System.out.println(str);
            bw.write(str+"\n");
        }
 
 
		//예제 출처
		//http://hunit.tistory.com/166
		StringTokenizer str = new StringTokenizer(text, "\t");
		int countTokens = str.countTokens();
		for(int i=0; i<countTokens; i++)
		{
			String data = str.nextToken();
 
            System.out.print("나눈 데이터 : ");
			System.out.println(data);
		}
 
        br.close();
        fr.close();
 
        bw.close();
        fw.close();
    }
}