Why JPanel doesn't have all the lines in my app?

Why JPanel doesn't have all the lines in my app?

By : thien
Date : November 22 2020, 10:48 AM
hop of those help? My JPanel is supposed to contain 300 lines of text, but no matter what I do to enlarge it's size, it won't contain all 300 line of text, why and how to fix ? Here is my code : , I figured it out, here is the answer :
code :
class A_Chart_Panel extends JPanel
  Vector<String> String_Vector;
  final int PAD=2;

  A_Chart_Panel(Vector<String> String_Vector)
    setPreferredSize(new Dimension(530,String_Vector.size()*12));

  void Draw_Chart()
    Out("String_Vector.size() = "+String_Vector.size());

  protected void paintComponent(Graphics g)
    Graphics2D g2=(Graphics2D) g;
    int w=getWidth();
    int h=getHeight();

    double xScale=(w-2*PAD)/(20);
    double maxValue=String_Vector.size();
    double yScale =(h-2*PAD)/maxValue;
    // The origin location.  
    int x0=PAD;
    int y0=h-PAD;
    for (int j=0;j<String_Vector.size();j++)
      int x=x0+(int)(xScale*(j+1));
      int y=10+(int)(yScale*j);

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JPanel doesnt allow positioning component

JPanel doesnt allow positioning component

By : Paul Allen
Date : March 29 2020, 07:55 AM
To fix the issue you can do Without a working example, it appears you've left the default layout for the JPanel (which is a FlowLayout).
Start by creating a custom panel for each of your views, it will make it easier to manage and the apply them to the JTabbedPane.
code :
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Test {

    public static void main(String[] args) {
        new Test();

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {

                JFrame frame = new JFrame("Testing");

                JTabbedPane tp = new JTabbedPane();
                tp.add("Person", new JPanel());
                tp.add("Work Detail", new TestPane());


    public class TestPane extends JPanel {

        private JTextField name;
        private JTextField serial;
        private JTextField id;
        private JTextField email;

        private JComboBox level;

        public TestPane() {
            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.anchor = GridBagConstraints.EAST;
            gbc.insets = new Insets(2, 2, 2, 2);

            add(new JLabel("Name"), gbc);
            gbc.gridx += 2;
            add(new JLabel("Sr No"), gbc);
            gbc.gridx = 0;
            add(new JLabel("ID"), gbc);
            gbc.gridx += 2;
            add(new JLabel("Email ID"), gbc);

            name = new JTextField(10);
            serial = new JTextField(10);
            id = new JTextField(10);
            email = new JTextField(10);

            level = new JComboBox(new String[]{"Manager", "Eng Lead", "Eng Designer", "Jr Designer"});

            gbc.anchor = GridBagConstraints.WEST;
            gbc.gridx = 1;
            gbc.gridy = 0;
            add(name, gbc);
            gbc.gridx += 2;
            add(serial, gbc);
            gbc.gridx = 1;
            add(id, gbc);
            gbc.gridx += 2;
            add(email, gbc);

            gbc.gridx = 0;
            gbc.gridwidth = GridBagConstraints.REMAINDER;
            add(level, gbc);

            gbc.anchor = GridBagConstraints.CENTER;
            add(new JButton("Save"), gbc);


JPanel paintComponent(...) doesnt work

JPanel paintComponent(...) doesnt work

By : Eartha
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further My first guess is that you're passing the wrong x and y.The x and y in g.drawImage are the coordinates of the top left corner, not the size of the image, so usually they are set directly at 0 (that means, g.draWimage(imga, x, y, this).
Java JPanel doesnt get painted

Java JPanel doesnt get painted

By : Tilo von Brandis
Date : March 29 2020, 07:55 AM
will help you Your render method on the JPanel should only update state, and call for a repaint. The painting will be done in paintComponent as a result of the call to repaint.
Java - Why doesnt the size of jpanel work

Java - Why doesnt the size of jpanel work

By : user2558103
Date : March 29 2020, 07:55 AM
it fixes the issue Just add your Exercise1 JPanel to the JFrame's content pane instead.
Also, don't forget to ensure that any code that touches your UI is done from the event dispatch thread.
code :
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

import java.awt.Dimension;
import java.net.InetAddress;

public class Exercise1 extends JPanel {
    private JLabel jlblIP = new JLabel("IP= 221.1231.231");
    private JLabel jlblName = new JLabel("Namn = DAMSKDLASM");
    private JLabel jlblHostIP = new JLabel("Host ip --------");
    private JLabel jlblHostName = new JLabel("Host name:");
    private JTextField jtxtfield = new JTextField("");
    private InetAddress ipaddress;

    public Exercise1(){
        setPreferredSize(new Dimension(200,200));


    public static void main(String[] args) {
        Exercise1 mainjpn = new Exercise1();
        Runnable r = new Runnable() {
            public void run() {
                JFrame jframe = new JFrame();
JPanel doesnt display the drawing

JPanel doesnt display the drawing

By : Ataro
Date : March 29 2020, 07:55 AM
To fix this issue Here is the answer, I forgot to set the size of the drawingBoard JPanel :-)
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