如何在文件上編寫用戶輸入，然後將其恢復回

Question

我已經完成了下面的代碼，以獲取5個用戶輸入並將其打印出來。現在我想從用戶那裏獲取輸入並將其保存到文件中，然後將其恢復。請求我需要解釋我可以做這件事的人。

感謝和問候

import java.io.BufferedReader; 
import java.io.InputStreamReader; 

public class user_info { 

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

     int i; 
     String Uname; 
     int UIDnum; 
     user_input[] input = new user_input[5]; 
     BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); 

     for (i = 0; i < input.length; i++) { 
      input[i] = new user_input(); 
      int number = i + 1; 
      System.out.println("User:" + number); 
      System.out.println("Please Enter your name:"); 
      Uname = br.readLine(); 
      input[i].setName(Uname); 

      System.out.println("Please Enter your ID number:"); 
      UIDnum = Integer.parseInt(br.readLine()); 
      input[i].setIDnum(UIDnum); 

     } 
          //char n = (char)UIDnum; 
     //String u = Integer.toString(UIDnum); 

     for (i = 0; i < input.length; i++) { 

      System.out.println("your name:" + input[i].getName()); 
      System.out.println("your ID number:" + input[i].getIDnum()); 

     } 

    } 
} 

Answer 1

也許你可以看看下面的鏈接規定：

https://www.caveofprogramming.com/java/java-file-reading-and-writing-files-in-java.html