如何使用Java中的键盘输入来写入文件？

Question

I wrote a program to write in a file...

package iofile;
import java.io.*;
public class WriteFile {


    public static void main(String[] args) {
        String s;
        File file=new File("C:\\Users\\Rajesh\\oacert\\Learn\\src\\iofile\\raj.txt");

        InputStreamReader isr=new InputStreamReader(System.in);
        BufferedReader br=new BufferedReader(isr);
        try{
        PrintWriter pr=new PrintWriter(new BufferedWriter(new FileWriter(file,true)));
        System.out.println("enter to write in a file...");
        s=br.readLine();
        while(s!=null){
            pr.println(s);
            s=br.readLine();
        }
        pr.close();
        }
        catch(Exception e){

        }


    }

}

But it's unable to write anything in raj.txt. What's causing this? Thanks in Advance NOTE: raj.txt exists in the mentioned directory...

Answer 1

I don't think s can ever be null in your code. You should better use a terminating string to exit the program. Try replacing this:

    while(s!=null){

with

    while(!s.equals("exit")){

and enter 'exit' to terminate the loop

Answer 2

1. Use write method.

2. Put an end condition, such as s.equalsIgnoreCase("Exit")

3. Call method flush;

Try the following code.

while(!s.equalsIgnoreCase("Exit")){

            pr.write(s);
            pr.write("\n");
            s=br.readLine();
        }
        pr.flush();
        pr.close();