jpanel

问题 This question already has an answer here : Error loading background image into JPanel in a JFrame (1 answer) Closed last month . I insert a background imag e into a JPanel but some interface elements disappear. The following Java Swing elements do not appear: label_titulo label_usuario label_password button_acceder **Can you make the image transparent or that the elements are not opaque (setOpaque (false)), even putting it to those elements does not work for me. Why do some elements have

问题 This question already has an answer here : Error loading background image into JPanel in a JFrame (1 answer) Closed last month . I insert a background imag e into a JPanel but some interface elements disappear. The following Java Swing elements do not appear: label_titulo label_usuario label_password button_acceder **Can you make the image transparent or that the elements are not opaque (setOpaque (false)), even putting it to those elements does not work for me. Why do some elements have

问题 When I added JComboBox, JRadioButton, JButton to JPanel, it was working fine, but after I added them to JFrame instead and executed it, all these components were gone. My code is listed below: import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Test21 { public static void main(String[] args) { JFrame jf = new JFrame("康樂彩歌(v0)"); jf.setBounds(0, 0, 1368, 730); jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JLabel label1 = new JLabel("選歌："); //創建標簽 label1.setFont

问题 This question already has an answer here : Error loading background image into JPanel in a JFrame (1 answer) Closed 21 days ago . I insert a background imag e into a JPanel but some interface elements disappear. The following Java Swing elements do not appear: label_titulo label_usuario label_password button_acceder **Can you make the image transparent or that the elements are not opaque (setOpaque (false)), even putting it to those elements does not work for me. Why do some elements have

问题 This question already has an answer here : Error loading background image into JPanel in a JFrame (1 answer) Closed 21 days ago . I insert a background imag e into a JPanel but some interface elements disappear. The following Java Swing elements do not appear: label_titulo label_usuario label_password button_acceder **Can you make the image transparent or that the elements are not opaque (setOpaque (false)), even putting it to those elements does not work for me. Why do some elements have

问题 I have a JFrame in which I want to occupy it entirely with a JPanel and put a background image in the JPanel . Code: public class InicioSesion extends javax.swing.JFrame{ private Image imagenFondo; private URL fondo; public InicioSesion(){ initComponents(); try{ fondo = this.getClass().getResource("fondo.jpg"); imagenFondo = ImageIO.read(fondo); }catch(IOException ex){ ex.printStackTrace(); System.out.print("Image dont load"); //Dont load the message. } Container c = getContentPane(); c.add

问题 I have a JFrame in which I want to occupy it entirely with a JPanel and put a background image in the JPanel . Code: public class InicioSesion extends javax.swing.JFrame{ private Image imagenFondo; private URL fondo; public InicioSesion(){ initComponents(); try{ fondo = this.getClass().getResource("fondo.jpg"); imagenFondo = ImageIO.read(fondo); }catch(IOException ex){ ex.printStackTrace(); System.out.print("Image dont load"); //Dont load the message. } Container c = getContentPane(); c.add

问题 This question already has answers here : Drag and Resize undecorated JFrame (2 answers) Closed 5 years ago . I've been making an undecorated JFrame so far and I was wondering if it's possible to move the undecorated JFrame by holding click on a JPanel. Here is the source code I'm working on. private static void createFrame() { JFrame frame = new JFrame("Text Frame"); frame.setLayout(null); frame.setSize(500,300); frame.setUndecorated(true); JPanel panel = new JPanel(); panel.setBounds(0, 2,

问题 Here's the class in which I try to draw the lines package gps; import java.awt.*; import java.awt.geom.Line2D; import java.util.*; import javax.swing.*; public class RoadMap extends JPanel { public void paintComponent(Graphics2D g) { super.paintComponent(g); g.setColor(Color.blue); for(int i = 0; i < Graph.getEdges().length; i++) { Shape s = new Line2D.Double(Graph.vMap.get(Graph.getEdges()[i].i1).x, Graph.vMap.get(Graph.getEdges()[i].i1).y, Graph.vMap.get(Graph.getEdges()[i].i2).x, Graph

问题 I want to modify the size of the JPanel while the program is running, for example with a menu item. How can I reach it? Or how should I modify my program to get acces to the live JPanel in the content pane? Edit: If I make a contentpane for a gamefield that's 400x400 in the start as default. But what if I want to ad an option in the menu to change the size to 500x500, but without losing all of the content already in progress by the player. JFrame class: package me.test; import javax.swing