My program here asks for an unit to choose from (fl.oz, gal, oz, lb, in, ft, or mi), asks how much of it they have, and asks for the unit they wish to convert to (mL, l, g, kg, mm, cm, m, or km).
My program works, refusing to convert from silly conversions such as gal to cm, telling you to re-input if they enter anything other than fl.oz, gal, etc.
The only thing I cannot figure out is if the user inputs something like "foo" when the program prompts the user for how much of the unit they have. My goal is to have the program say something like "That is not a number! Please enter a numerical value."
My current dilemma right now is that if the user inputs something other than a number, it will catch the exception and print a line telling the user it's not a number, except, it does it infinitely (stuck in a loop). Here is my code:
import java.util.InputMismatchException;
import java.util.Scanner;
public class UnitConversions {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
double result = 0;
I am trying to create an event handler for two JTextFields to only allow numerical input. It consumes all letter but for some reason the "n" key still gets through. I have the spaghetti code below.
public void keyTyped(KeyEvent in) { char input = in.getKeyChar(); if (in.getSource() == scaleField){ if (!(Character.isDigit(input) || (input==KeyEvent.VK_BACK_SPACE) ||
I have to ask how many children's tickets you want to order. When I apply the code below, it just accepts whatever I input, including letters. I imagine it is to do with setting childrensTickets = 0? If I input a letter using the below it accepts - shouldn't it print the error given the input is not >=0?
System.out.print("How many children's tickets do you require? "); int childrensTickets = 0; boolean validChildrenValue = false; while (validChildrenValue == false) { if(aScanner.hasNextInt()) {
System.out.print("To begin, please enter 1 to choose stand tickets or 2 to choose terrace tickets for your party. "); int standOrTerraceTickets = aScanner.nextInt(); while (standOrTerraceTickets != 1 && standOrTerraceTickets != 2) { System.out.print("Invalid input. Please enter 1 for stand tickets or 2 for terrace tickets. "); standOrTerraceTickets = aScanner.nextInt(); }
Okay I thought I had this working properly so that when the user entered anything other than 1 or 2 they would keep getting an error invalid input, however, that only works when the user enters an integer. If the user enters anything other than a number, the program crashes. How does one prevent this from happening?
The code for my button is below - I know it is wrong and that I need to change line 8 at least,so I am technically asking the property object if there is a key_name there but I dont quite get how to do that
//code for button
JButton btnSearch = new JButton("Search"); btnSearch.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { //find selected command String key_name = textFieldSearch.getText();
[Code] ....
I basically just want the user typed in word to be checked against a keyword in a proeprties file and if it exists, pull the key and the value back into a panel ....
Write a program that prompts the user for an input number and checks to see if that input number is greater than zero. If the input number is greater than 0, the program does a multiplication of all the numbers up to the input number starting with the input number. For example if the user inputs the number 9, then the program displays the following sum:
9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1 = 362880
That's the question I'm getting and so far all I've got is
import java.util.Scanner; public class Lab4Q3 { public static void main (String[] args) { int keyboard;
The project is to develop the game Translate the Word .... It is asking user to translate a word proposed to and check if the input response is correct. At the end of the game score will be calculated and displayed.
Game Play :
1 - Ask the user to specify , through the console , its name and the number of words to offer . It is up to you to handle exceptions (eg number of words greater than the number you provided ) 2 - Recover user response ( the word translated ) and check whether to continue . (eg you want to continue (y / n)) after each proposal. 3 - compare the response of the user with that which is preset for the word in question . 4 - Show the score at the end ( or at the breakpoint ) . 5 - Save the file in a user name , the score , the number of questions and the start date and end of the game played .
Some notes to consider :
1 - The language (eg, English - French , English - Arabic , etc. . ): It is up to you to specify the language adopted in the game and inform the user of your choice. 2 - The word bank to offer : It is up to you to develop the appropriate means to get the words to propose to the user. That said , the words and their translations can be retrieved :
a. a TXT file b . an XML file . ( Tutorials DOM and SAX ) c . CSV file ( OpenCSV Tutorial ) d. a database ( Tutorial Access) e . through APIs (eg Wordnet and google translate etc . ) . f . a combination of the previous options a, bc , d and / or e . (eg words stored in a txt file and answers retrieved from the api google translate) g . etc. .
Examples of files and databases are attached to the project statement . You will need to add one or more external libraries to your project. Click here for details on adding external libraries to Netbeans .
3 - A user will be associated with the question score if he can translate the word correctly. The score for each question can be calculated based on the number of words / questions to be proposed .
Development : In this project you will need at least a class called Question to encapsulate the word and its translations and provide all necessary methods to manipulate the object type Question.
An interface called IParser to make extensible project. Any class that implements IParser is a parser file (XML , TXT , CSV , etc.). / Database. In your project there will be a single class that implements IParser and will be used to retrieve words and their translations.
Add the ability to store the questions and answers of the user on the hard disk. Make the class Serializable Question
I decided to code this quiz I took in class about asking the user to input a string and the code is suppose to check for upper case letters. If a upper case letter is found, it should increase a count by one. Once the check is done, it should display the number of uppercase letters. For some reason I am getting this weird compile error stating that symbols can't be found...
Java Code:
import java.util.*; import java.lang.*; public class StringCheck{ public static void main(String[] args){ Scanner input = new Scanner(System.in); System.out.println("please enter a string: " ); String s = input.nextLine();
I have created the GUI interface required but there seems like there has to be an easier way. I also don't know how to get the input from the textboxes turn them into doubles and store them in an array. Here is my code.
//Here are the imports
import javax.swing.*; import java.awt.*; import java.awt.event.*; public class StatJFrame extends JFrame { // here are the declarations final int FRAME_WIDTH = 480; final int FRAME_HEIGHT = 360; int x = 0;
I am trying to write a date program. I have it written and running correctly, except one issue. I cannot get the numerical date to display correctly. I know it is an issue with printf. I don't know anything about printf. Here is my method to return the day
public int getDay() { return day; }
When it returns, it is literally returning just the numeric date. I need it to show up as 02 or 03 instead of 2 or 3, respectively.
A group of my classmates and I were discussing strings. We were asked, "What circumstances would you want to convert a text string to numerical data?" but we couldn't think of any answers outside of counting characters within the string for various applications.
I tried running the code for trapezoidal rule. It's my project in Numerical Methods, here's the code:
static double trapezoidRule (int size, double[] x, double[] y) { double sum = 0.0, increment; for ( int k = 1; k < size; k++ ) {//Trapezoid rule: 1/2 h * (f0 + f1) increment = 0.5 * (x[k]-x[k-1]) * (y[k]+y[k-1]); sum += increment;
[Code] ....
It cannot be compiled and I always get FileNotFoundException. I found on Javadocs that this will be thrown when a file with the pathname does not exist.
My code's not working and I don't know why. I'm trying to read numerical values from a file and saving all instances where a letter is entered instead of a number to a string to be referenced as an error at a later point on in the code. However, there's an error and like I've stated before, I don't know what caused it.
public static void validateData() throws IOException{ File myfile = new File("gradeInput.txt"); Scanner inputFile = new Scanner(myfile); for (int i=0; i<33; i++){ if(inputFile.hasNextDouble()){ double d = inputFile.nextDouble(); if (d<0||d>99999){
[Code] ....
This is the error that returns.
Exception in thread "main" java.util.NoSuchElementException at java.util.Scanner.throwFor(Scanner.java:838) at java.util.Scanner.next(Scanner.java:1347) at Paniagua_Grading.validateData(Paniagua_Grading.java:29) at Paniagua_Grading.main(Paniagua_Grading.java:6)
I am having trouble figuring out how to check for win in tic tac toe, the way my teacher wants it is with various if statements but im not sure what to put in the parentheses. I think it would be something like
This SHOULD be a simple program, the gist of it is Given an element E and the array A that represents a set X (user input), write a program that determines whetherE is an element of X.I have the array list all set up to take the user input and make zero the last element of the array. I want user to input numbers into array, then have fixed numbers for E and check to see if E is in the Array. I guess I'm not sure how to check the array and see if E is in the array? Here is what I have so far...
import java.util.ArrayList; import java.util.Scanner; import java.util.List; import java.util.InputMismatchException; public class Set { public static void main(String[] args) { List<Integer> userInputArray = new ArrayList<Integer>();
I am having an issue with my swing gui. I dynamically create tabs with information (textfields, checkboxes, combo boxes) and when I select the checkbox it disables or enables a textfield. Now when I select the checkbox it seems to resize everything, specifically my textfields from say 9 columns to probably one. I"m a little unsure why it is doing this but I have a feeling it may be an inheritence issue.
My code is below for my generation of the tabs and of the rest of the information on the gui. The gui is an inner rid layout with a top and bottom pane that are both gridbaglayouts and an outter pane as well. I am thinking I am missing something in the grid layout setup that is causing this.
1. In jsp 1 , i have 3 checkboxes(chkbox1,chkbox2,chkbox3) , if i select check boxes (chkbox1, chkbox2), and click on submit, corresponding two text fields (chkbox1,chkbox2) will have to appear in the next jsp i.e., jsp 2.
2. In jsp 1 , i have 3 checkboxes(chkbox1,chkbox2,chkbox3) , if i select check boxes (chkbox2, chkbox3), and click on submit, corresponding two text fields(chkbox2,chkbox3) will have to appear in the next jsp i.e., jsp 2.
Like this, which ever checkbox i select, corresponding text fields should appear in the subsequent jsp.
I am trying to write a program that will generate a QR Code from an input text and also display some information about the input/output bits. So far I have created the frame and what to do next. And I'm not sure if I am on the right track since my level of programming is not that great. By the way, I am using zxing libraries from GitHub. I know, there are plenty of generators online for the QR Code, but that is not what I am looking for. As you can see on the attached image, I am more interested in the efficiency of encoding 2D data. Also, I noticed that almost all the online projects regarding 2D codes are for Android. Which is not very useful.
I'm trying to come up with a method that would validate each turn a player makes. For a turn to be valid, it has to only contain numbers from 0 to 3(inclusive) and at least one digit must not be 0. Here is what I`ve come up with so far. For example, with "303" as the number and "101" as the turn, the turn would be valid and my method should return true, but it does not.
public static boolean turnIsValid (String number, String turn ){ boolean rep=false; int pos1=0; char min='0'; char max='3'; while(number.length()==turn.length()&&pos1<turn.length()){
My goal is to make a working spell check program.I have made some progress, but the more I test, the more issues I get and I continue to edit the algorithm.
import java.util.*; import java.io.*; public class SpellCheckTestClass{ public static void main(String [] args) throws IOException{ ArrayList<String> englishwords = new ArrayList<String>(); ArrayList<String> suggestions = new ArrayList<String>(); Scanner in = new Scanner(System.in); String entry = in.next();
