jpanel

问题 I posted a question earlier about this but the solution never worked and now it's under different circumstances. I'm making a "penny pitch" program, that, when the "confirm" button is pressed, a randomized number will dictate which spot on the board(the board is fill with image icons) the "penny" will fall, and in the process it removes the image icon that use to occupant the chosen space. I set up a GridBagLayout to constrain each icon down, and my button has no problem removing the chosen

问题 I have been trying to use the arrow keys as part of my application. Following the best practice I have stuck with using key bindings. I gound that the arow keys do not produce a key typed event so I employed this answer. However, my application has a number of components and I found that if I have a JToolbar in my JFrame the method in the previous link no longer works. Why is this and how do I have a JToolbar and use key bindings? Here is a SSCCE public class ArrowTest extends JFrame { public

问题 I need to change the cursor while it moves over an array-list of rectangles by the contain(p) method.The problem is My first algorithm to use an iterator to iterate through the rectangles doesn't work as expected.The cursor only changes when hovering over the first rectangle,in the other rectangles neither does it respond by showing the cursor changing nor indicate through the console that the cursor is hovering above them?!! My second solution also refuses to work properly.I use a for loop

问题 I can't get my JLabel to center in my JPanel after adding a ChartPanel to it: JPanel panel = new JPanel(new BorderLayout()); panel.add(visualiser(ternaire), BorderLayout.NORTH);//visualiser(ternaire) is the ChartPanel panel.add(new JLabel("L'alliage a bien été enregistré."), BorderLayout.CENTER); JOptionPane jop = new JOptionPane(); jop.showMessageDialog(null, panel, "Information", JOptionPane.PLAIN_MESSAGE); Any idea why BorderLayout.CENTER doesn't work ? 回答1: JLabel by default is

问题 I am trying to write a code that when the user clicks once, a little dot shows up, twice a line forms from the first and second clicks, and third forms a triangle out of all the clicks, and clicking again restarts with a dot. Currently I can get my JFrame and JPanel to open, but clicking does nothing. I added in a System.out.print command just to see if my mousePressed method ever ran, but it never does. Here is my code currently: import java.awt.Graphics; import java.awt.Point; import java

问题 I need to display chessboard. I have a BoardPanel class which extends JPanel and a GamePanel (also extending JPanel) class containing BoardPanel. GamePanel fills all the application frame. I want BoardPanel to always be a square with size equal to the minimum of GamePanel's width and height (if GamePanel's width is greater than height there should be empty space on the left and right, if it's smaller there should be empty space on top and bottom). It's also important that BoardPanel should be

问题 I use JTable with horizontal and vertical scrollbars. My JTable has empty space after rows with data. When I open panel that is situated down of my table it hides a part of JTable and scrolling appears on JTable. This is normal behavior, but then I close that panel, empty space without data becomes grey instead of white color. This only happens when I have horizontal scrollbar on my JTable. I suppose I must force JTable to repaint, I tried resizeAndRepaint() on TableHeader and JTable but it

问题 I am creating a Tetris clone as a personal project. In order to switch between the menus, I am using a CardLayout , but I have come across a problem. When I switch from one menu to the other, the focus does not transfer to the other JPanel . How can I fix this? Here is my JFrame: package com.cgp.tetris; import java.awt.CardLayout; import java.awt.Dimension; import java.awt.Toolkit; import javax.swing.JFrame; import javax.swing.JPanel; public class TetrisFrame extends JFrame { private static

问题 Picture this... A program GUI JFrame that is split in 2, EAST and WEST. The first JPanel is just a print preview screen. The EAST side of the JFrame is where the user can create a 1 2 or 3 size image. The user clicks the "Add" button and the defined image on the right goes to the panel on the left. So if the user clicks "Add" 3 times with different size images, then the panel uses FlowLayout to organize the added panel images added on the left. When you run this code, you can see a sorta idea

问题 for school I am working on a Java GUI program to store some administrative data. Now I want to display eventdata from my DB (mysql) into a JPanel with use of a JTextField, my problem is I can't get the size of the JTextField fixed as it always takes up a lot of place (see picture) Picture: http://postimg.org/image/5pcklo5n1/ Here's my code, anyone some tips? (I am new to java): public void editEvent() { JFrame frEventEdit = new JFrame ("Event Edit Menu"); frEventEdit.setDefaultCloseOperation