I was assigned to create a program that opens up a window that asked the user for an input of 0-10. This input will create three windows with the correct number of rows and columns of JTextFields in the form of a matrix. the third window has a button that adds the two matrices (which also take user input) and adds them together and prints them in the correct matrix fields. I am having trouble declaring the 2d array from the user input and creating the windows with the correct amount of jtextfields to move on with my program.
I had to make a program that would take two matrices and add them together but I get red lines under certain parts causing me not able to run the program . Here is my code :
import java.util.Scanner; public class Matrix { public static void main(String[] args) { Scanner input = new Scanner(System.in); final int N = 3; System.out.print("Enter Matrix 1: ");
[Code] ....
And here are the segments that are showing red lines :
if (i == m1.length / 2); System.out.print(" = "); else System.out.print(" ");
And here
System.out.println(" The Matrix are added as followed "); printResult(matrix1, matrix2, resultMatrix, " + ");
This is the method public void populateMatrices(int [][]mat1, int [][]mat2). I know how to do it for one matrix, but what do we do for the additional matrix? Here is the code I have so far.
for (int row =0; row<mat1.length;row++){ for (int column = 0; column<mat1[row].length;column++){ mat1[row][column]=1 + (int)(Math.random()*5);
I am working on a number of utility functions for square matrices and arrays, and I keep having trouble with segmentation faults.
arrayUtils~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ public class ArrayUtils { //This function takes an array a, and returns the sum between indices //i and j, where i is the lower index and j is the upper index. int size makes //sure that the function doesn't go out of bounds. public static int subSum(int[] a,int i, int j) { int sum=0;
I am instructed to create a program that reads input from the user and turns it into a desired matrix size (row and column between 0-10). I have written the code for the input window, however I am having trouble with the Event Handler for the JButton in said window. The JButton should read the info (row and column size) and create three new windows. Two of the windows will hold info entered into the matrix by the user, and the third window will have another button that adds the two matrices together and shows the output. I have always had trouble comprehending how to use and implement JButtons. Here's my code thus far.
I am making a Sudoku game and creating a matrix of JTextFields. However I am getting the following errors
Exception in thread "main" java.lang.NullPointerException at SudokuView.board(SudokuView.java:30) at SudokuView.<init>(SudokuView.java:18) at SudokuMain.main(SudokuMain.java:5)
I know the problem is with this code
box[i][j] = new JTextField(); panel.add(box[i][j]);
I know this because when I do this:
panel.add(new JTextField());
It works. However it puzzles me why it is not working.
Whole Code:
import java.awt.GridLayout; import javax.swing.*; public class SudokuView { JFrame frame; JPanel panelBoard; JTextField[][] box; int row=10; int col=10; SudokuView(){ frame = new JFrame("Play Sudoku GOOD LUCK");
Here's My code to create multiple JTextfields in a Single Option Pane.
My goal is simple.
Take some input from the user and then store it a TEXT File.
package printer; import java.awt.Toolkit; import java.io.BufferedWriter; import java.io.FileWriter; import java.io.IOException; import javax.swing.*; public class Database { JTextField name = new JTextField(); JTextField roll = new JTextField();
I need to create a JFrame with a user given amount of text fields in the form of a matrix. Say the user inputs 5 rows and 5 columns, I need to read those ints and create a 5 by 5 box of JTextFields in matrix form (i.e. 25 total text boxes in the form of a box). Here is some of the code I have been trying to use to do this...
int x = 10; int y = 10; for(int i = 0; i<rowSize; i++){ y= y+40; for(int k =0; k<colSize; k++) { newField = new JTextField("0"); newField.setBounds(x,y,40,20); win2.add(newField,0); win2.repaint(); x= x+60; } }
In order to go through the loop a given amount of times and create that amount of text fields in the correct places.Am I even close to doing this right?? Cuz I can't get the text fields to even show up on my window.
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) ||
Code given below does real time validation for 2 JTextFields. While entering some values to txt1 and txt2 enables the save button and removing values from txt2 or txt1 reset the save button to disable. I use Netbeans as IDE.What I want to do is, enable Save button after checking multiple JTextFields for validity. If any of the text fields is empty, btnSave must be disabled.This program gives expected result up to some extent. But there is little issue. After form appears for the first time, When I type something on Textfield1, Save button enables without checking Textfield2. This happens only at the first time.
public class NewJFrame extends javax.swing.JFrame { private Boolean isValidFromTextField1 = true; private Boolean isValidFromTextField2 = true; public NewJFrame() { initComponents(); btnSave.setEnabled(false);
I am working on my second javafx program and I am getting confused. The program that I am writing is a payroll calculator. A secondary window opens at the start of the program where the user first enters the number of employees and clicks submit to save the number and to close this window. Then, the user begins to enters the employee information (first name, last name, pay rate and hours worked) when the user clicks the NextEmp button, I want the data in the text fields to be entered into arrays for later use, then clear the fields for the next use. I am running into 2 issues. The first is the close event for the secondary window that pops up. I cannot figure out the syntax. The second issue that I am running into is the loop to store the data into the arrays. I believe I am getting the text field data correctly, but I cannot figure out how to stop the loop until the NextEmp button is pressed again.
I have an ArrayList of JTextFields in a CAMSetup1 class that contains a bunch of named JTextFields: Layer_textField_1, Layer_textField_2, Layer_textField_3, ... etc
I would like to check the .isEnabled status of a particular JTextField in that ArrayList from my main class by passing the name of the JTextField to a method in the CAMSetup1 class as a string
The peice of code calling the method from the main class is something like this:
if (CAMSetup1.getFieldEnabledStatus("Layer_textField_1") == true) { data.writeToFile(CAMSetup1.getFieldText("Layer_textField_2") + " LAYER 2 LIST FILE "); }
The method for checking the .isEnabled that I have so far is:
public boolean getFieldEnabledStatus(String textFieldname) { boolean status = false; //<need code here> return status; }
I develop a finite element code at java. I am looking for efficiency solver and fast for large, sparse , symmetric and positive define matrices .
i used in jblas but i encounter in problem when the matrix has high condition number(ill condition number) and i get error for singular matrix while in mathematica i succeed to solve that system without problems...
Any good solver and fast solver package in java can i use for solving that system?
I have made a window using JFrame and on my JPanel I have added 3 components: 2 JTextFields ("field1" and "field2") and inbetween them a JButton ("switch"). My goal is to switch the value of field1 to field2 and vice versa when the JButton is clicked. I thought this ActionListener which I have added to my JButton would achieve my goal:
public void actionPerformed(ActionEvent e) { field2.setText(field1.getText()); field1.setText(field2.getText()); }
However, it changes the value of field2 into the value of field1 but not the other way around.
I am working on a text based adventure game. (This is NOT OOP at all) The problem comes in at my second if statement inside my loop, it is not adding 1 to my array locations[] it keep printing location[0] then a 1 at the end. Not really sure what is going on here. I would like it to when I type "Go north" it adds 1 to locations[]
E.G locations[0] Go north locations[1] go north locations[2] package com.PenguinGaming; import java.util.Scanner; public class Game{
I'm really struggling adding JLabels to my GUI. The code is giving no errors but the JLables aren't showing up as I think I've done something else wrong. Here's my method for adding the JLabels:
public void showGraphics(){ for(int i=0; i<message.length(); i++){ if(message.charAt(i) == '#'){ JLabel localLabel = new JLabel("test label"); getContentPane().add(localLabel); } } }
I think the problem might be to do with how the rest of the GUI is setup and the fact that I haven't specified where to add the JLabel just that I'm adding them.
The serializable class ImagePanel does not declare a static final serialVersionUID field of type long public class ImagePanel extends JPanel{ ^^^^^^^ ^ ^^2 problems (1 error, 1 warning) mh_sh_highlight_all('java');
im basically just trying to put the image inside the GUI and centre the text underneath it. Which is hard to believe since the text is above the image in the code .
I have a supermarket checkout line where i have a list of available products on the left and then a basket on the right with the products in. The products are listed in an array, here is the product class
public class Product { private String name; private double weight; private double price;
[Code] ....
with getters and setters excluded, and the list these are put into
public class productList extends DefaultListModel { public productList (){ super(); } public void addProduct (String name, double weight, double price, int code){ super.addElement(new Product(name, weight, price, code));
i have the price for each product to be displayed in a text field with the following code
addBasketItem = new JButton(); getContentPane().add(addBasketItem); addBasketItem.setText("Add >");
[Code] ....
defaultCheckoutList contains my available items and defaultMainList is the basket, with mainTillPrice being the jtextfield.
This works to get the price however it just replaces each time i make a new entry with the price for the next item, i want a total of the price of all the items i have added, but not sure how.
I want to be able to check that the data for the ID is limited to a certain collection of characters formatted in a certain. For example, I may wish to limit it to 5 lowercase letters or numbers, or a combination of both. How could I do this?
Here is my program. I have to add the outputs from variable 'done' together. It seems to not work inside or outside the loop.
//A program that will find the last/check digit of a Book ISBN number.
import java.util.*; public class ISBN { public static void main(String[] args) { Scanner kb = new Scanner(System.in); System.out.println("Enter the ISBN number>"); String isbn = kb.nextLine(); //Even though the ISBN code is a number,
I wanted to create a interface with buttons ofshapes and type of transformation where user first select a shape, the shape will appear and user will have to click on the buttons on resize, reflect, rotate or skew to transform to shape. How can i do the coding? such as adding listeners to the shapes?
