jlabel | 易学教程

Why isn't this int incrementing?

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问题 I am stuck on probably an easy problem, but I really can't find why it isn't working. I am trying to increase mijnScore with 1 each time the method gets called. But somehow mijnScore goes back to 0 after the method is done. int mijnScore = 0; ... public void updateUI() { System.out.println("updateUI"); SwingUtilities.invokeLater(new Runnable() { public void run() { ikWin = true; while(ikWin) { mijnScore++; System.out.println("mijnScore" + mijnScore); Scoresp1.setText(mijnScore + ""); ikWin =

Insert JTextArea into a JPanel with a JLabel

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问题 I am trying to display the drawing that I have posted. When my code runs and the user clicks Account, the panel only displays the buttons "OK" and "Cancel" (see screenshot). I have added three JTextAreas with a JLabel for each to the panel accountPanel but they don't display. My code is below. import java.awt.BorderLayout; import java.awt.GridLayout; import java.awt.Component; import java.awt.LayoutManager; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax

Resizing image to fit frame

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问题 A part of my application is working as a tutorial. For that purpose I got JPanels that display a JLabel that has an image as content. Although when the image is larger than what fits the screen it will just cut what doesn't fit. What I need to do is resize the image so that I will fit the space the JLabel is given. Also tried using JScrollPanes but didn't make any difference(although I prefer to resize image). I tried getting a scaled instance of the image using Image scaledImg = myPicture

Importing a JLabel array into a JComponent

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问题 I looked around trying to resolve my issue but could not find anything to resolve this. I am really new to java and am trying to do projects from the book without using the console but here is what I have, import javax.swing.JComponent; import javax.swing.JLabel; import javax.swing.JOptionPane; public class FutureInvestmentValue { public static void main(String[] args) { double investmentAmount = Double.parseDouble(JOptionPane.showInputDialog(null, "Enter in the investment amount as a double.

ArrayList content to JLabel

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问题 If i have an ArrayList of type Integer, containing numbers like 1,3,4,9,10 etc... How can i display those on a JLabel, not the sum, but all the numbers in a sequence. So the JLabel would display, in this case: 134910 Thank you in advance for any help. EDIT: Thank you all, ofcourse i should have thought about append. Anyways, thanks all! 回答1: Like this: StringBuilder sb = new StringBuilder(); for (Integer i : list) { sb.append(i == null ? "" : i.toString()); } lbl.setText(sb.toString()); 回答2:

Drawing lines between JLabel in 2d array grid

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问题 I'm trying to draw lines between cells which are JLabel but fail to get their coordinates. The lines must follow a path from a startPoint to an endPoint. In my View class, the below code creates the grid: void createGrid(int rows, int cols) { MyMouseListener listener = new MyMouseListener(); setRows(rows); mainPanel.setLayout(new GridLayout(rows, cols, 1, 1)); mainPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK)); mainPanel.setBackground(Color.DARK_GRAY); grid = new JLabel[rows]

Enable blinking of JLabel 3 times and then remain invisible/disappear

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问题 I intend on writing java code which controls a JLabel to blink three times and then after the third blink enable the text within it to remain transparent/"disappear." As indicated from the code below, I've been able to write a JLabel which continuously blinks but would like to create one that blinks only three times and then enable the text within it to remain transparent. public class BlinkLabel extends JLabel { private static final long serialVersionUID = 1L; private static final int

JLabel shifts the text vertically down while displaying HTML

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问题 I would like to understand why a JLabel, rendering HTML, shifts the vertical position of it's output text, whereas a JLabel which renders non-HTML, does not. Java version used : 1.6.0_37 Swing Look and Feel used : Windows ("com.sun.java.swing.plaf.windows.WindowsLookAndFeel") OS : Windows 7 64 Bit I did not put a SSCCE together since the code is really trivial. But if it helps please say so. I rather give an examples using an images displaying the behavior: I put a JPanel as the container

Importing a JLabel array into a JComponent

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I looked around trying to resolve my issue but could not find anything to resolve this. I am really new to java and am trying to do projects from the book without using the console but here is what I have, import javax.swing.JComponent; import javax.swing.JLabel; import javax.swing.JOptionPane; public class FutureInvestmentValue { public static void main(String[] args) { double investmentAmount = Double.parseDouble(JOptionPane.showInputDialog(null, "Enter in the investment amount as a double.", "Investment Amout", JOptionPane.PLAIN_MESSAGE)); double monthlyInterestRate = Double.parseDouble

image loading using a JFileChooser into a JFrame

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问题 I am trying to write a code that displays an image selected using a JFileChooser into another JFrame .I tried the following code below but only got the following errors. Exception in thread "main" java.lang.NullPointerException at javax.swing.ImageIcon.<init>(ImageIcon.java:228) at power.<init>(fCGUI.java:53) at fCGUI.main(fCGUI.java:11) Here is the code: import javax.imageio.ImageIO; import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.awt.image.BufferedImage; import