Question

编写一个Java应用程序，使用Java的输入输出流技术将FileInput.txt的内容逐行读出，每读出一行就顺序为其

Answer 1

import java.io.*;

public class FileLineNumber {
public static void main(String[] args) throws Exception {
appendLineNumber(new File("FileLineNumber.java"), new File("a.txt"));
}

public static void appendLineNumber(File from, File to) throws Exception {
BufferedReader in = new BufferedReader(new FileReader(from));
StringBuilder sb = new StringBuilder();
String t;
int lineNumber = 1;
while((t = in.readLine()) != null) {
sb.append(lineNumber + " ");
sb.append(t);
sb.append(System.getProperty("line.separator"));
lineNumber++;
}
in.close();
BufferedWriter out = new BufferedWriter(new FileWriter(to));
out.write(sb.toString());
out.close();
}
}
请采纳答案，支持我一下。