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  1. /*
  2.  * To change this license header, choose License Headers in Project Properties.
  3.  * To change this template file, choose Tools | Templates
  4.  * and open the template in the editor.
  5.  */
  6. package os_a4;
  7.  
  8. import java.util.Vector;
  9.  
  10. /**
  11.  *
  12.  * @author amr
  13.  */
  14. public class OS_A4 {
  15.     String curUserName="admain";
  16.     Vector<String>userNames=new Vector<String>();
  17.      Vector<String>passwords=new Vector<String>();
  18. public void addNewUser(String userName,String password)
  19.     {
  20. 		// add userName & password that send at parameter 
  21. 		// to vector<string> userNames and vector<string> passwords
  22. 		// but should (global variable)curUserName is admin
  23. 		// and userName shouldn't be at vector<string> userNames 
  24. 		// you can use function findAtuserNames that you implement that
  25.         if(curUserName.equals("admain"))
  26.         {
  27.             if(findAtuserNames(userName))
  28.             {
  29.                 userNames.add(userName);
  30.                 passwords.add(password);
  31.             }
  32.             else
  33.                 {
  34.                     System.err.println("This User Name is  Exsist int the System choose another one");
  35.                 }
  36.         }
  37.         else 
  38.             {
  39.                 System.err.println("YOu Don't have the Rights to Add New User ");
  40.             }
  41.     }
  42.  
  43.     public boolean findAtuserNames(String userName)
  44.     {
  45. 		for(int i=0;i<userNames.size();i++)
  46.                     if(userNames.get(i).equals(userName))
  47.                         return false;
  48.                 return true;
  49.     }
  50.  
  51.     public boolean correctPassword(String userName,String password)
  52.     {
  53. 		// return if userName and password that send in parameter 
  54. 		// at vector<string> userNames and vector<string> passwords or not
  55.         for(int i=0;i<userNames.size();i++)
  56.         {
  57.             if(userNames.get(i).equals(userName)&&passwords.get(i).equals(password))
  58.                 return true;
  59.         }
  60.         return false;
  61.     }
  62.  
  63.     public void changeUser(String userName,String password)
  64.     {
  65. 		// change curUserName to username that send at parameter 
  66. 		// but you should do that if this username already at vector<string> userNames
  67. 		// and password match to this userName
  68.         if(findAtuserNames(userName)==false )
  69.         {
  70.             if(correctPassword(userName, password))
  71.             {
  72.                 curUserName=userName;
  73.             }
  74.             else
  75.                 {
  76.                     System.err.println("Wrong Passoword");
  77.                 }
  78.         }
  79.         else
  80.             {
  81.                 System.err.println("this user  not in the system ");
  82.             }
  83.     }
  84.     public static void main(String[] args) {
  85.        OS_A4 a=new OS_A4();
  86.        a.addNewUser("amr mamdouh","123");
  87.        a.addNewUser("amr mamdouh", "2030");
  88.        a.changeUser("amr mamdouh","2030");
  89.        a.changeUser("amr mamdouh","123");
  90.         System.out.println("Cur User is "+a.curUserName);
  91.     }
  92.  
  93. }
  94.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
Main.java:14: error: class OS_A4 is public, should be declared in a file named OS_A4.java
public class OS_A4 {
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/8kFtL1
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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