用Java生成文本文件

import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.io.IOException;
public class Result {
　 private File result =new File("result.txt");
　 private FileWriter writer;
private PrintWriter pw;
public Result() {
try {
　　 writer = new FileWriter("result.txt");
pw=new PrintWriter(writer);
　 }
　 catch (IOException iox){
　　 System.err.println(iox);
　 }
}
public void　aLine(String in) { //寫入一行
pw.println(in);
}
　 public void finish() {　//關閉輸入流，將文字從緩存寫入文件
try{
pw.flush();
writer.close();
}catch (IOException iox){
　　　　　 System.err.println(iox);
}
}
}