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  • Delete last 3 lines within while ((line = r.ReadLine()) != null) but not open a new text file to delete the lines?

    - by user1473672
    This is the code I've seen so far to delete last 3 lines in a text file, but it's required to determine string[] lines = File.ReadAllLines(); which is nt necessary for me to do so. string[] lines = File.ReadAllLines(@"C:\\Users.txt"); StringBuilder sb = new StringBuilder(); int count = lines.Length - 3; // except last 3 lines for (int s = 0; s < count; s++) { sb.AppendLine(lines[s]); } The code works well, but I don't wanna re-read the file as I've mentioned the streamreader above : using (StreamReader r = new StreamReader(@"C:\\Users.txt")) Im new to C#, as far as I know, after using streamreader, and if I wanna modify the lines, I have to use this : while ((line = r.ReadLine()) != null) { #sample codes inside the bracket line = line.Replace("|", ""); line = line.Replace("MY30", ""); line = line.Replace("E", ""); } So, is there any way to delete the last 3 lines in the file within the "while ((line = r.ReadLine()) != null)" ?? I have to delete lines, replace lines and a few more modications in one shot, so I can't keep opening/reading the same text file again and again to modify the lines. I hope the way I ask is understable for you guys .< Plz help me, I know the question sounds simple but I've searched so many ways to solve it but failed =( So far, my code is : using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; namespace ConsoleApplication11 { public class Read { static void Main(string[] args) { string tempFile = Path.GetTempFileName(); using (StreamReader r = new StreamReader(@"C:\\Users\SAP Report.txt")) { using (StreamWriter sw = new StreamWrite (@"C:\\Users\output2.txt")) { string line; while ((line = r.ReadLine()) != null) { line = line.Replace("|", ""); line = line.Replace("MY30", ""); line = line.Replace("E", ""); line = System.Text.RegularExpressions.Regex.Replace(line, @"\s{2,}", " "); sw.WriteLine(line); } } } } } } Now my next task is to delete the last 3 lines in the file after these codes, and I need help on this one. Thank you.

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  • Partially Modifying an XML serialized document.

    - by Stacey
    I have an XML document, several actually, that will be editable via a front-end UI. I've discovered a problem with this approach (other than the fact that it is using xml files instead of a database... but I cannot change that right now). If one user makes a change while another user is in the process of making a change, then the second one's changes will overwrite the first. I need to be able to request objects from the xml files, change them, and then submit the changes back to the xml file without re-writing the entire file. I've got my entire xml access class posted here (which was formed thanks to wonderful help from stackoverflow!) using System; using System.Linq; using System.Collections; using System.Collections.Generic; namespace Repositories { /// <summary> /// A file base repository represents a data backing that is stored in an .xml file. /// </summary> public partial class Repository<T> : IRepository { /// <summary> /// Default constructor for a file repository /// </summary> public Repository() { } /// <summary> /// Initialize a basic repository with a filename. This will have to be passed from a context to be mapped. /// </summary> /// <param name="filename"></param> public Repository(string filename) { FileName = filename; } /// <summary> /// Discovers a single item from this repository. /// </summary> /// <typeparam name="TItem">The type of item to recover.</typeparam> /// <typeparam name="TCollection">The collection the item belongs to.</typeparam> /// <param name="expression"></param> /// <returns></returns> public TItem Single<TItem, TCollection>(Predicate<TItem> expression) where TCollection : IDisposable, IEnumerable<TItem> { using (var list = List<TCollection>()) { return list.Single(i => expression(i)); } } /// <summary> /// Discovers a collection from the repository, /// </summary> /// <typeparam name="TCollection"></typeparam> /// <returns></returns> public TCollection List<TCollection>() where TCollection : IDisposable { using (var list = System.Xml.Serializer.Deserialize<TCollection>(FileName)) { return (TCollection)list; } } /// <summary> /// Discovers a single item from this repository. /// </summary> /// <typeparam name="TItem">The type of item to recover.</typeparam> /// <typeparam name="TCollection">The collection the item belongs to.</typeparam> /// <param name="expression"></param> /// <returns></returns> public List<TItem> Select<TItem, TCollection>(Predicate<TItem> expression) where TCollection : IDisposable, IEnumerable<TItem> { using (var list = List<TCollection>()) { return list.Where( i => expression(i) ).ToList<TItem>(); } } /// <summary> /// Attempts to save an entire collection. /// </summary> /// <typeparam name="TCollection"></typeparam> /// <param name="collection"></param> /// <returns></returns> public Boolean Save<TCollection>(TCollection collection) { try { // load the collection into an xml reader and try to serialize it. System.Xml.XmlDocument xDoc = new System.Xml.XmlDocument(); xDoc.LoadXml(System.Xml.Serializer.Serialize<TCollection>(collection)); // attempt to flush the file xDoc.Save(FileName); // assume success return true; } catch { return false; } } internal string FileName { get; private set; } } public interface IRepository { TItem Single<TItem, TCollection>(Predicate<TItem> expression) where TCollection : IDisposable, IEnumerable<TItem>; TCollection List<TCollection>() where TCollection : IDisposable; List<TItem> Select<TItem, TCollection>(Predicate<TItem> expression) where TCollection : IDisposable, IEnumerable<TItem>; Boolean Save<TCollection>(TCollection collection); } }

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  • what does synchronization mean in hibernate..

    - by abc
    i read that upon session.flush() The data will be synchronized (but not committed) when session.flush() is called what is synchronized with what.. whether it is DB state that will come to memory by querying or memory state will be copied to Db ? clarify this plz..

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  • Error compiling basic java code

    - by Michael Younani
    New to java. Practicing coding by following a book. Heres my code: class Motorcycle { //Three instance variables - make and color are strings. while a boolean refers to TRUE OR FLASE(in this case off or on) String make; String color; boolean engineState; void startEngine() { if (engineState == true) System.out.print("The engine is already on."); else { engineState = true; System.out.print("The engine is now on."); } void showAtts() { System.out.print("This motorcycle is a " + color + " " + make); if (engineState ==true) System.out.print("The engine is on."); else System.out.print("The engine is off."); } } } When I compile I get 2 errors: 1) illegal start of expression 2) ; expected I can't pin point the problem. If anyone can direct me or hint me please do.

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  • how to get email id from google api response

    - by user1726508
    i am able to get user information from Google API response using oath2 . But i do't know how to get those responses individually . Response i am getting from Google Api: * Access token: ya29.AHES6ZQ3QxKxnfAzpZasdfd23423NuxJs29gMa39MXV551yMmyM5IgA { "id": "112361893525676437860", "name": "Ansuman Singh", "given_name": "Ansuman", "family_name": "Singh", "link": "https://plus.google.com/112361893525676437860", "gender": "male", "birthday": "0000-03-18", "locale": "en" } Original Token: ya29.AHES6ZQ3QxKxnfAzpZu0lYHYu8sdfsdafdgMa39MXV551yMmyM5IgA New Token: ya29.AHES6ZQ3QxKxnfdsfsdaYHYu8TNuxJs29gMa39MXV551yMmyM5IgA But i want only "id" & "name" indiviually to save in my Database table. How can i do this? I got those above response/output By using the below code. public static void main(String[] args) throws IOException { ------------------------- ------------------------- ------------------------- String accessToken = authResponse.accessToken; GoogleAccessProtectedResource access = new GoogleAccessProtectedResource(accessToken, TRANSPORT, JSON_FACTORY, CLIENT_ID, CLIENT_SECRET, authResponse.refreshToken); HttpRequestFactory rf = TRANSPORT.createRequestFactory(access); System.out.println("Access token: " + authResponse.accessToken); String url = "https://www.googleapis.com/oauth2/v1/userinfo?alt=json&access_token=" + authResponse.accessToken; final StringBuffer r = new StringBuffer(); final URL u = new URL(url); final URLConnection uc = u.openConnection(); final int end = 1000; InputStreamReader isr = null; BufferedReader br = null; isr = new InputStreamReader(uc.getInputStream()); br = new BufferedReader(isr); final int chk = 0; while ((url = br.readLine()) != null) { if ((chk >= 0) && ((chk < end))) { r.append(url).append('\n'); } } System.out.print(""); System.out.println(); System.out.print(" "+ r ); //this is printing at once but i want them individually access.refreshToken(); System.out.println("Original Token: " + accessToken + " New Token: " + access.getAccessToken()); }

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  • All is working except if($_POST['submit']=='Update')

    - by user1319909
    I have a working registration and login system. I am trying to create a form where a user can add product registration info (via mysql update). I can't seem to get the db to actually update the fields. What am I missing here?!? <?php define('INCLUDE_CHECK',true); require 'connect.php'; require 'functions.php'; // Those two files can be included only if INCLUDE_CHECK is defined session_name('tzLogin'); // Starting the session session_set_cookie_params(2*7*24*60*60); // Making the cookie live for 2 weeks session_start(); if($_SESSION['id'] && !isset($_COOKIE['tzRemember']) && !$_SESSION['rememberMe']) { // If you are logged in, but you don't have the tzRemember cookie (browser restart) // and you have not checked the rememberMe checkbox: $_SESSION = array(); session_destroy(); // Destroy the session } if(isset($_GET['logoff'])) { $_SESSION = array(); session_destroy(); header("Location: index_login3.php"); exit; } if($_POST['submit']=='Login') { // Checking whether the Login form has been submitted $err = array(); // Will hold our errors if(!$_POST['username'] || !$_POST['password']) $err[] = 'All the fields must be filled in!'; if(!count($err)) { $_POST['username'] = mysql_real_escape_string($_POST['username']); $_POST['password'] = mysql_real_escape_string($_POST['password']); $_POST['rememberMe'] = (int)$_POST['rememberMe']; // Escaping all input data $row = mysql_fetch_assoc(mysql_query("SELECT * FROM electrix_users WHERE usr='{$_POST['username']}' AND pass='".md5($_POST['password'])."'")); if($row['usr']) { // If everything is OK login $_SESSION['usr']=$row['usr']; $_SESSION['id'] = $row['id']; $_SESSION['email'] = $row['email']; $_SESSION['first'] = $row['first']; $_SESSION['last'] = $row['last']; $_SESSION['address1'] = $row['address1']; $_SESSION['address2'] = $row['address2']; $_SESSION['city'] = $row['city']; $_SESSION['state'] = $row['state']; $_SESSION['zip'] = $row['zip']; $_SESSION['country'] = $row['country']; $_SESSION['product1'] = $row['product1']; $_SESSION['serial1'] = $row['serial1']; $_SESSION['product2'] = $row['product2']; $_SESSION['serial2'] = $row['serial2']; $_SESSION['product3'] = $row['product3']; $_SESSION['serial3'] = $row['serial3']; $_SESSION['rememberMe'] = $_POST['rememberMe']; // Store some data in the session setcookie('tzRemember',$_POST['rememberMe']); } else $err[]='Wrong username and/or password!'; } if($err) $_SESSION['msg']['login-err'] = implode('<br />',$err); // Save the error messages in the session header("Location: index_login3.php"); exit; } else if($_POST['submit']=='Register') { // If the Register form has been submitted $err = array(); if(strlen($_POST['username'])<4 || strlen($_POST['username'])>32) { $err[]='Your username must be between 3 and 32 characters!'; } if(preg_match('/[^a-z0-9\-\_\.]+/i',$_POST['username'])) { $err[]='Your username contains invalid characters!'; } if(!checkEmail($_POST['email'])) { $err[]='Your email is not valid!'; } if(!count($err)) { // If there are no errors $pass = substr(md5($_SERVER['REMOTE_ADDR'].microtime().rand(1,100000)),0,6); // Generate a random password $_POST['email'] = mysql_real_escape_string($_POST['email']); $_POST['username'] = mysql_real_escape_string($_POST['username']); $_POST['first'] = mysql_real_escape_string($_POST['first']); $_POST['last'] = mysql_real_escape_string($_POST['last']); $_POST['address1'] = mysql_real_escape_string($_POST['address1']); $_POST['address2'] = mysql_real_escape_string($_POST['address2']); $_POST['city'] = mysql_real_escape_string($_POST['city']); $_POST['state'] = mysql_real_escape_string($_POST['state']); $_POST['zip'] = mysql_real_escape_string($_POST['zip']); $_POST['country'] = mysql_real_escape_string($_POST['country']); // Escape the input data mysql_query(" INSERT INTO electrix_users(usr,pass,email,first,last,address1,address2,city,state,zip,country,regIP,dt) VALUES( '".$_POST['username']."', '".md5($pass)."', '".$_POST['email']."', '".$_POST['first']."', '".$_POST['last']."', '".$_POST['address1']."', '".$_POST['address2']."', '".$_POST['city']."', '".$_POST['state']."', '".$_POST['zip']."', '".$_POST['country']."', '".$_SERVER['REMOTE_ADDR']."', NOW() )"); if(mysql_affected_rows($link)==1) { send_mail( '[email protected]', $_POST['email'], 'Your New Electrix User Password', 'Thank you for registering at www.electrixpro.com. Your password is: '.$pass); $_SESSION['msg']['reg-success']='We sent you an email with your new password!'; } else $err[]='This username is already taken!'; } if(count($err)) { $_SESSION['msg']['reg-err'] = implode('<br />',$err); } header("Location: index_login3.php"); exit; } if($_POST['submit']=='Update') { { mysql_query(" UPDATE electrix_users(product1,serial1,product2,serial2,product3,serial3) WHERE usr='{$_POST['username']}' VALUES( '".$_POST['product1']."', '".$_POST['serial1']."', '".$_POST['product2']."', '".$_POST['serial2']."', '".$_POST['product3']."', '".$_POST['serial3']."', )"); if(mysql_affected_rows($link)==1) { $_SESSION['msg']['upd-success']='Thank you for registering your Electrix product'; } else $err[]='So Sad!'; } if(count($err)) { $_SESSION['msg']['upd-err'] = implode('<br />',$err); } header("Location: index_login3.php"); exit; } if($_SESSION['msg']) { // The script below shows the sliding panel on page load $script = ' <script type="text/javascript"> $(function(){ $("div#panel").show(); $("#toggle a").toggle(); }); </script>'; } ?>

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  • Freeing of allocated memory in Solaris/Linux

    - by user355159
    Hi, I have written a small program and compiled it under Solaris/Linux platform to measure the performance of applying this code to my application. The program is written in such a way, initially using sbrk(0) system call, i have taken base address of the heap region. After that i have allocated an 1.5GB of memory using malloc system call, Then i used memcpy system call to copy 1.5GB of content to the allocated memory area. Then, I freed the allocated memory. After freeing, i used again sbrk(0) system call to view the heap size. This is where i little confused. In solaris, eventhough, i freed the memory allocated (of nearly 1.5GB) the heap size of the process is huge. But i run the same application in linux, after freeing, i found that the heap size of the process is equal to the size of the heap memory before allocation of 1.5GB. I know Solaris does not frees memory immediately, but i don't know how to tune the solaris kernel to immediately free the memory after free() system call. Also, please explain why the same problem does not comes under Linux? Can anyone help me out of this? Thanks, Santhosh.

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  • Inconsistent Behavior From Declared DLL Function

    - by Steven
    Why might my GetRawData declared function return a correct value when called from my VB.NET application, but return zero when called from my ASP.NET page? The code is exactly the same except for class type difference (Form / Page) and calling event handler (Form1_Load, Page_Load). Note: In the actual code, #DLL# and #RAWDATAFILE# are both absolute filenames to my DLL and raw data file respectively. Note: The DLL file was not created by Visual Studio. Form1.vb Public Class Form1 Declare Auto Function GetRawData Lib "#DLL#" (ByVal filename() As Byte, _ ByVal byteArray() As Byte, _ ByVal length As Int32) As Int32 Private Sub Form1_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load Dim buffer(10485760) As Byte Dim msg As String, length As Integer = 10485760 Dim filename As String = "#RAWDATAFILE#" length = GetRawData(Encoding.Default.GetBytes(filename), buffer, length) Default.aspx.vb Partial Public Class _Default Inherits System.Web.UI.Page Declare Auto Function GetRawData Lib "#DLL#" (ByVal filename() As Byte, _ ByVal byteArray() As Byte, _ ByVal length As Int32) As Int32 Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Me.Load Dim buffer(10485760) As Byte Dim msg As String, length As Integer = 10485760 Dim filename As String = "#RAWDATAFILE#" length = GetRawData(Encoding.Default.GetBytes(filename), buffer, length)

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  • Output of the following code

    - by terrific
    String s1 = "Amit"; //true String s2 = "Amit"; //true String s3 = new String("abcd"); //true String s4 = new String("abcd"); //false System.out.println(s1.equals(s2)); //true System.out.println((s1==s2)); //true System.out.println(s3.equals(s4)); //false System.out.println((s3==s4)); //false Assume it to be in main why the output of the above code is true true true false and not true true false false???

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  • Detecting user-activity on mac os x

    - by Nobik
    I use the function "IOPMSchedulePowerEvent" to schedule Sleep or Wake-Events and registered my daemon with "IORegisterForSystemPower" to receive power-state-changes. Everything works fine! When system going sleep and later waking up at scheduled time, my daemon do some work, and after it system should going sleep again. Now my questions: How can i detect, if the system was awaked by user or by the scheduled time? How can i detect, if a user currently working with the system, so the daemon have not to put it in sleep-mode??? Thanks Nobik

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  • How to generate dynamic Timers

    - by Jeeva
    I'm developing a web based game application using flex. I'm placing images dynamically inside a canvas . Whenever i place an image it should change it state after a period of time. For example after 2 mins it should change it state. The time has to be calculated for each image after i place the image. How shall i handle this.

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  • Please help with my twodimensional array source code

    - by Baiba
    Here is what i have done but i have some questions: class masivins { public static void main (String args[]) { int mas[][] = {{0, 2, 7, 0, 8, 5, 3}, {0, 4, 0, 6, 0, 0, 0}, {0, 0, 0, 0, 3, 0, 0}, {7, 0, 0, 9, 1, 0, 7}, {5, 0, 4, 0, 0, 2, 0}}; int nulmas[] = new int [7]; int nul=0; for(int j=0; j<7; j++) { nul=0; for(int i=0; i<5; i++) { if(mas[i][j]==0) { nul++; } } nulmas[j]=nul; } for(int i=0; i<5; i++) { for(int j=0; j<7; j++) { System.out.println(mas[i][j]); } System.out.println(); } System.out.println(); for(int i=0; i<5; i++) { System.out.println("Zeros in each array column: " + nulmas[i]); } System.out.println(); } } so my questions are: 1) why after running project there are only 5 "Zeros in each array column....." shown? 2) what and where i need to change in this code to get out the number of column in which zeros are least?

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  • How to read binary column in database into image on asp.net page?

    - by marko
    I want to read from database where I've stored a image in binary field and display a image. while (reader.Read()) { byte[] imgarr = (byte[])reader["file"]; Stream s = new MemoryStream(imgarr); System.Drawing.Image image = System.Drawing.Image.FromStream(s); Graphics g = Graphics.FromImage(image); g.DrawImage(image, new Point(400, 10)); image.Save(Response.OutputStream, ImageFormat.Jpeg); g.Dispose(); image.Dispose(); } con.Close(); This piece of code doesn't work: System.Drawing.Image image = System.Drawing.Image.FromStream(s); What am I doing wrong?

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  • How to break out of a loop depending on a CheckBox Checked value while the loop is running?

    - by Rayner Vaz
    Lets say I want to call a function repeatedly if the user selects a CheckBox named "repeat" but the calls to the function should stop as soon as the user 'unchecks' the CheckBox. I tried using the 'Checked', 'Click' and 'Tap' event of the CheckBox but once the loop starts, it does not sense any changes in the checkbox's state. I even tried using a loop inside another button's _Click method, but then that creates a lock on the Button's 'pressed' state. Any ideas/alternate suggestions?

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  • String Index Out Of Bound Exception error

    - by Fd Fehfhd
    Im not really sure why a am getting this error. But here is my code it is meant to test palindromes disregarding punctuation. So here is my code import java.util.Scanner; public class PalindromeTester { public static void main(String [] args) { Scanner kb = new Scanner(System.in); String txt = ""; int left; int right; int cntr = 0; do { System.out.println("Enter a word, phrase, or sentence (blank line to stop):"); txt = kb.nextLine(); txt = txt.toLowerCase(); char yP; String noP = ""; for (int i = 0; i < txt.length(); i++) { yP = txt.charAt(i); if (Character.isLetterOrDigit(txt.charAt(yP))) { noP += yP; } } txt = noP; left = 0; right = txt.length() -1; while (txt.charAt(left) == txt.charAt(right) && right > left) { left++; right--; } if (left > right) { System.out.println("Palindrome"); cntr++; } else { System.out.println("Not a palindrome"); } } while (!txt.equals("")); System.out.println("You found " + cntr + " palindromes. Thank you for using palindromeTester."); } } And if i test it and then i put enter so it will tell me how many palindromes you found the error i am getting is javav.lang.StringIndexOutOfBoundException : String index out of range 0 at PalindromeTester.main(PalindromeTester.java:38) and line 28 is while (txt.charAt(left) == txt.charAt(right) && right > left) Thanks for the help in advance

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  • ASP.net MVC View Creation

    - by nettguy
    I heard that ASP.net MVC does not maintain View State.So,here is my question I have an MVC -View which has forward and backward html button.When i click forward and again click backward ,how can i maintain html control state then?

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  • How does ambigous methods are resolved in java ?

    - by Jijoy
    Hi , I do have a question. package org.study.algos; public class Study { public static void main(String[] args) { A a = new A(); a.m1(null); } } class A { public void m1(String s) { System.out.println("String"); System.out.println(s); } public void m1(Object obj) { System.out.println("Object"); System.out.println(obj); } } Here , the output is String null Why JVM resolve the method to one with String arguement ? Thanks in advance J

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  • Filtering Linux command output

    - by Raajkumar
    Hi, I need to get a row based on column value just like querying a database. I have a command output like this, Name ID Mem VCPUs State Time(s) Domain-0 0 15485 16 r----- 1779042.1 prime95-01 512 1 -b---- 61.9 Here I need to list only those rows where state is "r". Something like this, Domain-0 0 15485 16 r----- 1779042.1 I have tried using "grep" and "awk" but still I am not able to succeed. Please help me on this issue. Regards, Raaj

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  • .NET: Start a thread as suspended

    - by Ikaso
    In unmanaged code you can create a thread in suspended state. In .NET Framework I can't find this option. Is it because the Thread constructor puts the thread in a suspended state? Is there other reasons why this is not supported?

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  • doubt in Exceptions

    - by Ajay Singh
    class MyException extends Exception { MyException() {} MyException(String msg) { super(msg);} } public class NewException { static void f() throws MyException { System.out.println("throwing exception from f()"); throw new ClassCastException(); } static void g() throws MyException { System.out.println("throwing exception from g()"); throw new MyException("parametrized "); } public static void main(String ...strings ) { try { f(); } catch(MyException e) { e.printStackTrace(System.out); } try { g(); } catch(MyException e) { e.printStackTrace(System.out); } } } In the function f() iam specifying that "MyException " exception will be thrown and actually iam throwing some other exception which has no relation with MyException but still the compiler does not report any complain.Why is it so??

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  • Validation - Data Integrity

    - by Thomas
    A table can only store 10 records in a particular state, 10 users over 30 years for example, the others must be less than 30 years. It is a business rule and as such should be respected. How to ensure that state? Think: multiple users accessing this table.

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  • Exploding a range of dates with LINQ

    - by Robert Gowland
    If I have a pair of dates, and I want to generate a list of all the dates between them (inclusive), I can do something like: System.DateTime s = new System.DateTime(2010, 06, 05); System.DateTime e = new System.DateTime(2010, 06, 09); var list = Enumerable.Range(0, (e - s).Days) .Select(value => s.AddDays(value)); What I'm stuck on is that I've got a list of pairs of dates that I want to explode into a list of all the dates between them. Example: {2010-05-06, 2010-05-09}, {2010-05-12, 2010-05-15} should result in {2010-05-06, 2010-05-07, 2010-05-08, 2010-05-09, 2010-05-12, 2010-05-13, 2010-05-14, 2010-05-15} Note the pairs of dates are guaranteed not to overlap each other.

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  • How to encrypt a RSAKey using another RSAKey?

    - by Tom Brito
    I know its not the usual thing to do. But the specification I'm implementing is discribed this way, and I cannot run out. I was trying to encrypt the modulus and exponent of the private key, but the following test code raises an exception because the byte array is 1 byte larger then the maximum allowed by RSA block: import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.NoSuchAlgorithmException; import java.security.NoSuchProviderException; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import javax.crypto.Cipher; import org.apache.commons.lang.ArrayUtils; public class TEST { public static KeyPair generateKeyPair() throws NoSuchAlgorithmException, NoSuchProviderException { KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA", "BC"); keyPairGenerator.initialize(1024); return keyPairGenerator.generateKeyPair(); } public static void main(String[] args) throws Exception { KeyPair keyPair = generateKeyPair(); RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); System.out.println("Priv modulus len = " + privateKey.getModulus().bitLength()); System.out.println("Priv exponent len = " + privateKey.getPrivateExponent().bitLength()); System.out.println("Priv modulus toByteArray len = " + privateKey.getModulus().toByteArray().length); byte[] byteArray = privateKey.getModulus().toByteArray(); // the byte at index 0 have no value (in every generation it is always zero) byteArray = ArrayUtils.subarray(byteArray, 1, byteArray.length); System.out.println("byteArray size: " + byteArray.length); RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); Cipher cipher = Cipher.getInstance("RSA", "BC"); cipher.init(Cipher.ENCRYPT_MODE, publicKey); byte[] encryptedBytes = cipher.doFinal(byteArray); System.out.println("Success!"); } } (obs. its just a test, i would never encrypt the private key with its pair public key) The byte array is 128 bytes, the exactly maximum allowed by a RSA block, so why the exception? And how to fix it?

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  • Is my code a correct implementation of insertion sort?

    - by user1657171
    This code sorts correctly. Is this an insertion sort? import java.util.Scanner; public class InsertionSort { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter the number of elements: "); int count; count = sc.nextInt(); int[] a = new int[count]; System.out.println("Enter elements: "); for(int i = 0 ; i<count;i++){ a[i] = sc.nextInt(); } int j,temp; System.out.println("aftr insertion sort :"); for(int i = 1 ; i<count;i++){ j=i; while(j>0 && a[j-1] > a[j] ){ temp = a[j]; a[j] = a[j-1]; a[j-1] = temp; j--; } } for(int i = 0 ; i<count;i++){ System.out.print(a[i]+" "); } } }

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