生成文本文件(收集)
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) { //写入一行
pw.println(in);

}
public void finish() { //关闭输入流，将文字从缓存写入文件

try{
pw.flush();
writer.close();
}catch (IOException iox){
System.err.println(iox);
}

}

}