3,978 Topics
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| | Hello, I have a program which creates multiple balls and bounces them off when they collide. This works fine. import java.awt.Rectangle; public class Ball{ private int x = 0; private int y = 0; private int radius; private int panelwidth = 500; private int panelheight = 500; private int xDx …  |
| | Need help with JTable header group : Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.table.JTableHeader cannot be cast to id.co.aal.common.GroupableTableHeader this is the part of table drawing ..... if(tabledraw) { tabledraw=false; for (int k = 0; k < m_data.getColumnCount(); k++) { TableCellRenderer renderer; if (k==Kehadirantable.COL_ALOKASI) renderer = new CheckCellRenderer(); else { DefaultTableCellRenderer … |
| | package Main2; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import javax.swing.JPanel; public class GamePanel extends JPanel implements Runnable{ final int originalTileSize = 16; //16x16 tile final int scale = 3; final int tileSize = originalTileSize * scale; // 48x48 final int maxScreenCol = 16; final int maxScreenRow = 12; …  |
| | Hello guys! Sorry newbie here. I get an error in Netbeans while trying to add an Icon to a J label. The error is: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "location" is null After importing all of the images I used for my project. I still get … |
| | Hello, May I know why the frame pops up double when I call it? Thank You! Login.java (line 63); import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.BufferedReader; import java.io.FileReader; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JTextField; public class Login{ JFrame frame = new JFrame(); JButton loginButton = …  |
| | I want to open JFrame (created from NetBeans) using the java class, but the JFrame is not showing up. I run the code from Eclipse. Here my class: (line 67) import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.BufferedReader; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.FileWriter; import java.util.Scanner; import javax.swing.JButton; … |
| | I'm trying to get a text at the customer.txt to validate if the customer has already registered Here is my code: import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.BufferedReader; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.FileWriter; import java.util.Scanner; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPasswordField; import … |
 | I'm trying to create two car objects, that move across the frame, in opposite directions, at different heights so they don't collide. This type of programming is new to me, and after following the only example I'm provided with, I still can't get this to work. All the code I … |
| | import net.proteanit.sql.DbUtils; import javax.swing.*; import javax.xml.transform.Result; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.sql.*; public class EmployeeRegistriation { private JPanel Main; private JTextField txtName; private JTextField txtSalary; private JTextField txtMobile; private JButton saveButton; private JTable table1; private JButton updateButton; private JButton deleteButton; private JButton searchButton; private JTextField txtId; private JScrollPane tabla_1; public … |
 | Thank you for your help! My code was: package com.Main.tile; import com.Main.GamePanel; import com.Main.UtilityTool; import javax.imageio.ImageIO; import java.awt.*; import java.awt.image.BufferedImage; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; public class TileManager { GamePanel gp; public Tile[] tile; public int mapTileNum[] []; public TileManager(GamePanel gp){ this.gp = gp; tile = new … |
| | I am using intellij for the java coursework which is related to clients and databases. I am receiving the following error Exception in thread "main" java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "location" is null at java.desktop/javax.swing.ImageIcon.<init>(ImageIcon.java:232) at client.Interface.$$$setupUI$$$(Interface.java) at client.Interface.<init>(Interface.java:54) at client.Application.main(Application.java:317) This is the code: ` ` package client; //region … |
| | [SIZE=4][FONT=Arial]Hi, I'm creating an application that makes use of the GridBagLayout as it is the most useful layout manager for what I need. I made a JPanel and added it to the frame. The result I'm currently getting during run-time is a JFrame with a JPanel placed in the center. … |
| | import javax.swing.*; import javax.swing.plaf.basic.BasicTreeUI; import java.awt.*; import java.awt.event.FocusListener; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; public class GamePanel extends JPanel implements Runnable, KeyListener{ final int originTileSize = 16; //The Size of the tiles, or grids final int scale = 3; final int tileSize = originTileSize * scale; final int screenCol = 10; final … |
| | Hi! I'm trying to improve a code shown below. My idea is to add multiple images to JPanel. It sounds like an easy task, but all my attempts failed so far. I tried to create [ICODE]Image image2 = getToolkit().getImage(Drag1.class.getResource("cross_cursor.gif"));[/ICODE] and then [ICODE]bi2 = new BufferedImage(image2.getWidth(this), image2.getHeight(this)...);[/ICODE]. But I can see … |
| | package sadbinproject; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.SQLException; import java.util.logging.Level; import java.util.logging.Logger; import javax.swing.JOptionPane; /** * * @author Notebook */ public final class admission_panel extends javax.swing.JFrame { /** * Creates new form admission_panel */ public admission_panel() { initComponents(); Connect(); } Connection con; PreparedStatement pst; public void Connect() { … |
 | I am attaching my complete code. I am not able to get why doesn't my KeyListener work. None of the KeyListener events are fires on pressing the keyboard. Please have a look and tell me the flaws in my code package swing; //First Class (separated class) import javax.swing.JFrame; public class … |
| | Hello, I have a program below where I am selecting a file and displaying the content using a JTextArea. It works fine, but when I add a JScroller, it does not display the area with the scroller. What am I doing wrong? import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.io.*; … |
| | Help me to generate a complete image after finishing my free drawing in paint Here is the code /* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ …  |
| | Hi i'm a beginner in Java. I have school assigment where they want to save employee array to the file and can load it back with replacing the current array in GUI when it hit button save or load. Also, if i want to save or load the array with … |
| | I was doing GUI based application, when i run the MyChatPage particularly, it able to send the text to the server and send to the client textarea, which is my objective, but if i run from MyChatIP class and create new object to open the MyCHatpage frame, it will hang, …  |
| | When i run my code i get this error: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: How do I fix this? this is my code so far: import java.awt.Font; import javax.swing.*; public class Program7 public static void showOutput(String output) { JTextArea jta = new JTextArea(output); jta.setFont(new Font("Consolas", Font.PLAIN, 60)); JOptionPane.showMessageDialog(null, jta); } … |
| | Hello everyone, I have some problems with my program , hope you can help me to solve it. 1- I need a method for the** Clear Time** button that remove the counter to be 0. ` private void btclearActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: min=0;sec=0; lblsec.remove(lblsec); … |
| | Hello I have a abstract class: import javax.swing.JOptionPane; public abstract class Question { static int nQuestions = 0; static int nCorrect = 0; String question; String correctAnswer; abstract String ask(); void check() { nQuestions++; String answer = ask(); if (answer.equals(correctAnswer)) { JOptionPane.showMessageDialog(null,"Correct!"); nCorrect++; } else { JOptionPane.showMessageDialog(null,"Incorrect. The correctanswer is … |
| | # Class 1 # import java.awt.Canvas; import java.awt.Color; import java.awt.image.BufferStrategy; import java.awt.Graphics; import java.lang.Runnable; import java.lang.Thread; import javax.swing.JFrame; import java.awt.image.BufferedImage; import javax.imageio.ImageIO; import java.io.IOException; public class Game extends JFrame implements Runnable{ private Canvas canvas = new Canvas(); private RenderHandler renderer; private BufferedImage testImage; private Rectangle testRectangle = new Rectangle(30, 90, … |
| | import java.awt.Canvas; import java.awt.Color; import java.awt.image.BufferStrategy; import java.awt.Graphics; import java.lang.Runnable; import java.lang.Thread; import javax.swing.JFrame; import java.awt.image.BufferedImage; import javax.imageio.ImageIO; import java.io.IOException; public class Game extends JFrame implements Runnable{ private Canvas canvas = new Canvas(); private RenderHandler renderer; private BufferedImage testImage; private Rectangle testRectangle = new Rectangle(30, 90, 100, 100); public Game() … |
| | # Class 1 # import java.awt.Canvas; import java.awt.Color; import java.awt.image.BufferStrategy; import java.awt.Graphics; import java.lang.Runnable; import java.lang.Thread; import javax.swing.JFrame; import java.awt.image.BufferedImage; import javax.imageio.ImageIO; import java.io.IOException; public class Game extends JFrame implements Runnable{ private Canvas canvas = new Canvas(); private RenderHandler renderer; private BufferedImage testImage; private Rectangle testRectangle = new Rectangle(30, 90, … |
| | It's not showing the image in the terminal window or the jframe. import java.awt.Canvas; import java.awt.Color; import java.awt.image.BufferStrategy; import java.awt.Graphics; import java.lang.Runnable; import java.lang.Thread; import javax.swing.JFrame; import java.awt.image.BufferedImage; import javax.imageio.ImageIO; import java.io.IOException; public class Game extends JFrame implements Runnable{ import java.awt.Graphics; import java.awt.image.BufferedImage; import java.awt.image.DataBufferInt; public class RenderHandler{ private BufferedImage … |
| | I made this game equivalent to tictactoe but with a slight twist called find the X between two players using socket programming with Java. Don't know where I went wrong in trying to find the X but for some odd reason my count variable never updates allowing the victory message … |
| | Hello, I am writing a Java program where the first JFrame has choices for number of shapes, width, height and the type of shape (oval, rectangle or both) and a button is clicked that opens up another JFrame where the shapes are drawn with a time delay until the number … |
| | My problem is setting the size of the JButton. I want it to be a little button centered below the "Hello World" JLabel field (as it is now it spans the full width of the JFrame). I am unsure what is causing the setPreferredsize to be ignored. I am an … |
| | At the risk of making a total fool of myself... I got very excited when I discovered that Java's "only opaque rectangular windows" limitation has been removed. Full release is intended for Java 7, but working methods can be accessed thru com.sun.awt.AWTUtilities in recent releases of Java 6 (I'm using …  |
| | The question is compPickInt will now be a 0,1, or 2. Use an ‘if-else if’ structure to convert the numbers to a char variable with the value of R or S or P and Prompt the user to enter R for Rock, S for Scissors or P for Paper. Use … |
| | Hii Guys I am currently Devloping a Java Remote Desktop Software like teamviewer I would like know some guidelines about the tools I can use for client and server side I could create a GUI using Swing and add by using Robot class to imitate mouseactions and keyactions and by … |
 | the below code is to list the running exe files in the windows task manager. but i need only the running applications in windows task manager. if aybody knows pls help me by sending code for this. i am awaiting pls. import java.io.*; import java.util.*; public class GetProcess { public … |
 | As President Obama's economic stimulus package winds its way through the politico, people in the tech sector wait with bated breath to find out what it will mean for the IT industry. Of particular interest is the section of the bill that details how the administration plans to go about …  |
| | hi all i am making a weather data program and i having a problem for bringinng my text file to the table. here i am putting all my code . and i also have to import a second output window for my code. for example when ever i enter ome … |
| | Hi guys so I was playing with some code which would determine the whether a string is a palindrome or not. Its been a mixed bag of results with some palindromes being detected while others aren't. I do apologize to the lack of polish of my comments but I hope … |
| | Why much time is needed to access an applet having swing components the first time? |
| | First how this happened. The Nissan Leaf from about 2011 to mid 2015 on the SV and SL models included Telematics. Telematics in thse models let the owner use a web site or smart phone app to query battery status, start or stop charging and turn on/off the climate control … |
| | Hi, I have two problems with application I write in Java. Now it looks like that: import java.awt.*; import javax.swing.*; public class Main{ public Main() { JFrame frame = new JFrame(); frame.setSize(1200,900); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); JPanel background = new JPanel(new GridBagLayout()); background.setBackground(Color.lightGray); LeftPanel lp = new LeftPanel(); background.add(lp, new GridBagConstraints(0,0,1,3,3.0,1.0, GridBagConstraints.WEST, … |
| | Hi, I'd like to ask you a few questions about a things which don't work right now in my (very simple) graphic interface. The code I have: import java.awt.*; import javax.swing.*; public class Simulation{ public Simulation() { JFrame frame = new JFrame(); frame.setSize(1200,900); frame.setTitle("Traffic simulator"); frame.setResizable(false); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); JPanel background … |
| | Guys, Im wondering, If I have another class with a jpanel in it... and I add this to the jPanel, this should work correct? jpanel.add(new DoughOverviewList()); jpanel.repaint(); for some reason its not showing in my jpanel, /* * To change this license header, choose License Headers in Project Properties. * … |
| | Hi Guys, I ussually dont post anything here often, just get everything off of everyone elses questions, but I'm having a strange problem that im scratching my head over, I have a JTable where I can Add and remove rows... This is just for testing purposes, I'm about to make … |
 | Hi , For my major project i have 7 months in hand. I have decided to make a video chatting application using java (like yahoo messenger or skype) with features , 1. Authentication of user name and password before logging in 2. one to one online video chatting . 3. … |
| | Guys, Ive gotten it into my head to do somthing fairly difficult for me, I want to communicate with a swing application, to a proximetly sensor, and track live when it senses somthing and how many times it has sensed somthing, I want to use java. theres alot more to … |
| | Hello, I would like to develop a sprite editor. Therefore I have programmed a software like paint. As you can see on the picture, on the right, there is a canvas with a grid on it. I use a GridBagLayout to manage every widgets inside my window. The canvas is … |
 | I feel hard to understand how the LayoutManager work even the GUI is quite simple. I trying to make the button place below the Tel No JTextField, but it placed beside Address JTextField , not below TelNo JTextField. package gui; import java.awt.BorderLayout; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import javax.swing.Box; … |
| | hi everyone I am currently practicing my java skills by doing this program called car rental management system. I am creating a login page where when the user login it should bring up a dashboard. but the problems when the user login and it say "credentials match, the dashboard doesnt … |
| | Hi Guys Its me again, wasnt sure if i should start a new thread so i just did :) I completly redid the code Now im having a problem with the renderer again. It called called in the timer of the controller class... but it doesant get called? Also my … |
| | Currantly trying to make a simple game but i cant get the renderer to repaint. My problem is that i used to make everything in 1 class... much simpler. But now im just not sure anymore. This is what i have so far... it just wont repaint. (Note i have … |
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