I'm building casar cipher with using ASCII. I'm done changing lower and upper case alphabet, but I don't know how to fix my code for changing number 9 to <.
here is my class code.
public class SimpleMessageCipher implements MessageCipher {
public String encode(String plainText,int shiftKey){
String cipherText="";
for(int i=0;i<plainText.length();i++)
{
//stores ascii value of character in the string at index 'i'
int c=plainText.charAt(i);
I have been assigned to make a program that encodes and decodes a given message with the given key (spaced numbers, for example: 3 1 7 4 2 5). I'll post the code for all the classes that I am using below.
QueueInterface:
import java.util.*; public interface QueueInterface<T> { T dequeue() throws QueueUnderflowException; boolean isEmpty();
Because those are the ones I had to write myself, the others were given to us to use. As far as these classes go, they work fine without causing any errors from the input I give. For example if I enter a message and a key, it correctly encodes and decodes the message with the given key. What I'd like for you fine programmers to do is give feedback on those 6 classes. Like, suggestions on how to make them better or more efficient, neater, changing any of the methods to make them more efficient or prevent any errors beforehand, etc.
I'm trying to make a simple Caesar cipher that takes in a String as the first argument and a integer shift as the second argument. Namely, there appears to be a problem with the loop and how I have declared the array - I want the converted characters to be put into a new array called newCharacterArray, converted back to a String and displayed in the command prompt window.
public class Caesar { public static void main(String inString, int k) { System.out.println("String: " + inString); char inStringArray[] = inString.toCharArray();
I am 4 weeks into my Intro to Java course and I am having a bit of trouble with my code. I need to make a program that will take a user inputted number, space the numbers out, then add them to a total sum. What I am having a hard time with is when I enter a negative number. I can't figure out what I need to do to have my program ignore the "-" in the string.
import java.util.*; public class Week4_Programming_Problem { static Scanner console = new Scanner(System.in); public static void main(String[] args) { int number, digit, sum=0; char digitPos;
I have an assignment, similar to ones of seen in the past. The assignment is to take a users text input and to encrypt it using 3 different types of encryptions: Caesar, Transpose, and Reverser. The professor gave us the bulk of the code, and more specifically how to tokenize and shift the letters using Caeser shift. The problem im coming across is that it is not showing anything past the users input. After running it, it just stays there running without showing anything.
Cipher:
package cipher; import java.util.Scanner; import java.util.StringTokenizer; import javax.swing.JOptionPane; public abstract class Cipher { public String message; StringBuilder encrypted_message, decrypted_message;
[Code] ....
The constants have their own separate class, and they appear to work fine. I know that the Transpose and Reverser are incomplete, hence them commented out. But if i cant finish with Caeser first, it wont work at all.
We have been tasked to create a Vigenere Cipher. At this stage however, I am attempting to get the program to encrypt a phrase using a single letter key (Caesar cipher), before progressing to the final stage, implementing a functioning Vigenere Cipher. The code below is able to encrypt a word, capatalise it, remove white space and shift it a certain amount of places, given the provided letter. My problem is that because the single letter is a String, not a char, the phrase is being shifted incorrectly. For example, when the program is given the Inputs: This is a test with the single letter key A, the program shifts all the characters by 1. The output however should read THISISATEST as A is supposed to be 0.
import java.util.Scanner; public class VigenereCipher { public static void main(String[] args) { char c;
I am trying to encrypt a string using substitution cipher, the program doesnt show any errors but the output is not what is expected. On encryption it shows random characters whereas i want it to be encrypted by another letter. This is what I have done:
/* Encryption using substitution */
import java.io.*; public class SSExp1 { public static void main(String args[]) { char[] ip= new char[20]; char[] op= new char[20]; char key = '3'; String b;
I have an program with an encryption and a decryption method, it works fine when i specify a name for the encrypted file, but i want the name for the encrypted file to be in cipher text, how do i do this and specify the path? i have marked out the "encryptionPath" specifically for specifying the location of the encrypted file which will have a cipher text name.
I was tasked with creating a program that encrypts a line of text (for example, CANDY) by shifting the letters X amount of times. For example, if the user inputs the sentence CANDY and selects a shift of 5, the output would be: HFSID. I got this part working fine. The issue I am having is with the decryption part of the program.
This is simply the reverse of the above, as the user would enter the phrase HFSID, with a shift of 5, and the program would output: CANDY. It works fine, all except for one letter, being the "F" letter. With my code, when I enter the above word to be decrypted it outputs: C[NDY
Obviously, that [ bracket is not an 'A'. I realise the issue falls with the equation, Here is my code:
public class SimpleEncryption {
/** * @param args the command line arguments */ static int answer; public static void main(String[] args) { String cipher = JOptionPane.showInputDialog(null, "Please enter a sentence or word that you wish to encode or decode. This program uses" + " a basic cipher shift.");
I have following Cipher Code and test for it. But I am getting following exception.
Java Code:
java.lang.IllegalStateException: Cipher not initialized at javax.crypto.Cipher.checkCipherState(Cipher.java:1672) at javax.crypto.Cipher.doFinal(Cipher.java:2079) at com.anjib.util.CipherUtil.encrypt(CipherUtil.java:67) at com.anjib.util.CipherTest.testEncryptDecrypt(CipherTest.java:23) mh_sh_highlight_all('java'); Java Code: public class CipherUtil { private static Logger log = Logger.getLogger(CipherUtil.class);
I want to encrypt a file and decrypt it on another host. For decryption on another host I guess I need to transfer the cipher... how can this be done? How can you write a Cipher to disk?Or am I completely on a wron track?
The following code is doing it already on one host:
I have a beginning Java Program I have been working on that creates a number guessing program where the computer guesses a number that the user is thinking of within a certain range. I so far have the program below, but need getting rid of a few kinks/ adding features.
-First, I need to set it up so that the user will be prompted and give a range. It should run and produce something like this:
Welcome to this first-ever mind-guessing program!
Please pick a range (higher than 1 and no larger than 50): 32
You will choose a number between 1 and 32... and I will try to guess it.
With each of my guess, you will tell me whether I am too high (h or H), too low (l or L), match (m or M), or you want to quit (q or Q). My objective is to find the number using as few guesses as possible.
-Second, the game is supposed to give up and restart after failing the five, guesses, but for some reason, after it fails the fifth time, it prompts a fifth guess once again instead, then restarts after- I need to prevent this, so that it should look something like this:
My fourth guess is 17: h My guess is too high?
My fifth guess is 16: h *** I am unlucky this round. I give up.
Let's play!
My first guess is 10: etc..
import java.util.*; import java.lang.Math; public class numguessprac1 { // Declaring variables public static String input; public static int quit; public static int guess; public static int wins;
So I am currently writing my first assignment and have run into problems with my coding. The task was to have someone enter a 5 digit number and in return, I list each number on their respective lines. We also must create an error if a number other than 5 digits was entered. My problem is that when they enter a 1 or 2,3,4,6,7,8 digit number.. the error message occurs along with the rest of the messages (listing the numbers, etc). I want the program to end (or even re-ask to enter the numbers) if they incorrectly enter the data.
trying to write a program that takes a user inputted number and converts it to a binary number.
Here's what I have:
package com.java2novice.algos; import java.util.Scanner; public class Converter { static Scanner console = new Scanner(System.in); public void printBinaryFormat(int number){ int binary = console.nextInt();
In a forest, there are some bamboo trees .The length of each tree get doubled during winter and increases by one unit in summer , write a Java program to calculate the total length of n number of bamboo trees in M number of seasons. The season always starts with winter.
import java.util.Scanner; public class Tree { public static void main(String args[]) { int length; int season;
We have triangle made of blocks. The topmost row has 1 block, the next row down has 2 blocks, the next row has 3 blocks, and so on. Compute recursively (no loops or multiplication) the total number of blocks in such a triangle with the given number of rows.
I am trying to create a method that prints the square root of a number up to a certain number. It needs to take a single int parameter for example "n" , and then print all of the (positive) even perfect squares less than n, each on a separate line. I want the method to be called something like this:
public void Squares(int n) { }
I need the output to look something like this:
Example: if n = 40, your code should print
4 16 36
So I have been working for a few hours now and am really stuck.
This is what I have so far:
int count = 0; int n = 4; int max = n; while(count < max) { System.out.println(n); n = n * n; count++;
I am working on a little nothing project, but I wanted to create a random number generator for a silly game where the user guesses the number.I have used google, but they are using LOG statements, what it does.
//read the file //make the numbers 1 string line //count the number of repetitiveness in the string for the numbers //display four lowest ones
import java.io.*; import java.util.*; public class Lottery2
[Code] ....
when I run it the array gets sorted but how do i keep the data in other words
what it is supposed to do is grab numbers from a file, and give me the lowest 4 numbers back. I know the numbers using the array but how do i pull out the lowest 4 and keep the data true no matter what numbers or how many of them are in the file.
i am trying to store a number of different value cards for a number of players. E.g there can be 2 , 4 or more players and each player can have any number of cards.
I have decided to use an arraylist for cards and tried using an array for players. But after coding and reading some information online, i realised that it is not possible to have an array of arraylist.
1. Write a Java program that randomly generates a five-digit lottery number and prompts the user to enter a five-digit number. Each digit in the number is in the range between 0~9. The program should determine which prize the user wins according to the following rule:
- The user wins the first prize if the user input matches all five digits in the lottery number in exact order. -The user wins the second prize if the user input matches any four digits in the lottery number in exact positions. -The user wins the third prize if the user input matches any three digits in the lottery number in its exact position. -The user wins the fourth prize if the user input matches any two digits in the lottery number in its exact position.
- The user wins the fifth prize if the user input matches any one digit in the lottery number in its exact position.here is my code. I have tried replacing the && statements with || and it always returns either case 1 or case default.
import java.util.Scanner; import java.util.Random; class Hw5 { static int getPrize(int g1, int g2, int g3, int g4, int g5, int u1, int u2, int u3, int u4, int u5) {
I'm having a hard time with this problem, this is what I have, but I can not use two integers, I have to use one integer and a string...
This is the question:
Write a method called printStrings that accepts a String and a number of repetitions as parameters and prints that String the given number of times. For example, the call:
printStrings("abc", 5);
will print the following output: abcabcabcabcabc
This is what I attempted:
public class printStringsproject { public static void printStrings(int abc, int number) { for (int i = 1; i <= number; i++) { System.out.print("abc"); } } public static void main(String[] args) { printStrings(1, 5); } }
I have a strange problems. Perhaps some of you already have had this problem before.
I have method which is suppose to check if the itemstate has changed. It ONLY works ONCE?
Thereafter, it does not matter how many times I changed the selection of the ComboBox.
Basically I have two Comboboxes.
1. If Combobox 1 is selected (e.g. Dogs, Cats) 2. Then get information from what ever the item from ComboBox 1 is selected, and display on ComboBox 2. (Dog Name, Cat Name etc)
E.g.
So If I selected Dogs on Combobox 1 Then display the Dog Names on Combobox 2. If I then change and select Cats on Combobox 1, then display Cat Names on ComboBox 2.
