如何比较用户名密码和密码与文本文件登录Java

Question

Below my code is only to input data into text file now i have to make a new login form when user put username password and secret code it will logged in if wrong then error i put some data in text file using code below now i want to compare from text file and logged in i am making a java program on sublime i am newbie this is my assignment how to compare in simplest way with text file data, text file contains username password secret code in same line how to arrange that i am stuck i am trying from last 9 hours its assignment

import java.util.*; 
import java.io.*;
public class Reg{

    public static void main (String[]args)throws IOException {

        Users p = new Users();
        Scanner sc = new Scanner(System.in);

        System.out.println("Enter username");
        String uu = sc.nextLine();
        p.setUser(uu);
        System.out.println("Enter password");
        String pp = sc.nextLine();
        p.setPassword(pp);
        System.out.println("Enter Secret number");
        String ss = sc.nextLine();
        p.setSecret(ss);

    FileWriter fw = new FileWriter(file);
    PrintWriter pw = new PrintWriter(fw);
    pw = new PrintWriter(new FileWriter("output.txt", true));
        pw.write(uu);
        pw.write(pp);
        pw.write(ss);


    pw.close();

}
}

Answer 1

You already created the pw, don't need to create again and i write something in the code you read from it. I wish it will help you.

import java.awt.Color;
import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;

import javax.swing.JFrame;

    public class Reg{

        public static void main (String[]args)throws IOException {

            Users p = new Users();
            String uu = "";
            String pp = "";
            String ss = "";
            //I think you created a method in Users and say logined or something error.
            While(Users.getLogin == false){
            //***I don't know the Users class you made

            Scanner sc = new Scanner(System.in);

            System.out.println("Enter username");
            uu = sc.nextLine();
            p.setUser(uu);
            System.out.println("Enter password");
            pp = sc.nextLine();
            p.setPassword(pp);
            System.out.println("Enter Secret number");
            ss= sc.nextLine();
            p.setSecret(ss);

            }



            //Something like this
        if(Users.getLogin == true){
            //if you wanna write something to the file, u can use this.
        FileWriter fw = new FileWriter("output.txt");
        PrintWriter pw = new PrintWriter(fw);
            pw.write(uu);
            pw.write(pp);
            pw.write(ss);

            //if you wanna write line by line use writeln, not write.


        pw.close();

    }
        }
}