jpanel

I have a a GUI looks as follow. I want to dynamically add/remove a panel. I use ArrayList to keep trace of JPanel objects. And now I could add panel dynamically, but when I want to delete a panel, I could not get its attribute so that I can not remove it. Here is my code: public class Main implements ActionListener{ private List <myPanel> mpList; private JPanel btnPanel; private JButton jbtAdd,jbtDelete; private JFrame jf; private JPanel jp; private JScrollPane js; private myPanel mp; private static int size=0; private int selectedId=-1; //private public Main(){ mpList=new ArrayList<myPanel>()

I have a JPanel which contains 2 more JPanel. Located on the left(leftBox) and the right(rB), I wanted to add a background image on the right JPanel (rB). But the result I get is http://i.imgur.com/tHz1x.jpg the result I wanted http://i.imgur.com/xHbpx.jpg public void paintComponent(Graphics g) { //this.paintComponent(g); if(wdimage != null) g.drawImage(wdimage,0,0,800,800,rB); //(image,location x, location y, size x, size y) } The rB Panel is blocking the image, what I want is to display the image on the JPanel, and add some jlabels and text field on top of the JPanel and image later on. Here

i have design a jpanel with so many swing components with scrollable capability. i want to export whole Jpanle into pdf file.but i am not able to export whole Jpanle. I have use itext for pdf generation. My problem is that i am not able to export whole jpanel into pdf. When i export half of Jpanel components export.but half portion do not export. this is my code. public void PrintFrameToPDF(JPanel c, File file) { try { Document d = new Document(); PdfWriter writer = PdfWriter.getInstance(d, new FileOutputStream("F://newfile.pdf")); d.open(); PdfContentByte cb = writer.getDirectContent();

I want to draw 2 (or more ) lines on JPanel when the mouse drags. When i use super.paintComponent(g) in my code, I couldn't draw 2 lines on the panel, however when I don't use super.paintComponent(g) ;, the result is ugly, like the pic below : I understand why the lines behaved like that. How could I draw the lines on the Jpanel when dragging the mouse? BTW, the line drawn by g2d.draw(line2d) sometimes it's not the smooth line (pic below) My codes so far : import java.awt.*; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java

Suppose I have a JPanel in a JFrame. When I invoke a method that changes the preferred size of that JPanel, it does not change. The code looks something like this: public class SomePanel extends JPanel{ public SomePanel(){ setPreferredSize( new Dimension( 390, 40 ) ); setBackground( Color.BLACK ); } public void expand(){ setPreferredSize( new Dimension( 390, 200 ) ); } public static void main( String args[] ){ JFrame frame = new JFrame(); frame.setSize( 450, 500 ); frame.setLayout( new FlowLayout() ); SomePanel somePanel = new SomePanel(); frame.add( somePanel ); frame.setVisible( true );

I unfortunately have to use multiple windows in this program and I don't think CardLayout is going to work because I can't have any buttons constant between the different layouts. So I'm trying to code a button to hide the present JPanel (thePanel) and show a new one (thePlacebo). I'm trying to hide thePanel in an ActionListener like this: frame.getContentPane().remove(thePanel); I thought this would work, but it just freezes my program as soon as I hit the button. Here's a chunk of the code for context: public class Reflexology1 extends JFrame{ JButton button1, button2; JButton movingButton;

i am doing a small Gui in java. i am using setBounds methods to set the position of buttons etc on my JFrame , but problem is that when i use it with JPanel button is not visible on JFrame , and without JPanel its quite ok ,, see both the codes and please help me as i am beginner and facing these foolish problems . This one is working fine JFrame jframe = new JFrame("Working Fine"); jframe.setLayout(null); JButton jbutton = new JButton("Position Test"); jbutton.setBounds(0, 0, 100, 100); jframe.add(jbutton); jframe.setSize(300,300); jframe.setVisible(true); Same code when i add Button to

I have a JPanel and JButton on the JFrame . on runtime add JLabel to JPanel When click JButton . I use of the following code: panel.setLayout(null); jLabel _lbl=new jLabel(); _lbl.setText("Label"); panel.add(_lbl); panel.validate(); but no display any JLabel in JPanel . I see you create a JLabel called _lbl : JLabel _lbl=new JLabel(); but you never add it to your panel. Instead you add a new JLabel with no text to your panel: panel.add(new JLabel()); This would ofcourse construct an empty label which wont be visible. Also try calling revalidate() and repaint() on your JPanel instance after