Ultra noob problem

[Keenan Staffieri]

Ok, I try to compile a JPanel App, and I get this error for some reason! I'm using java sdk 1.5, and runtime 1.5(the most uptodate one) and im getting this problem. My applet programs run fine, but I cant seem to get JPanel to work, thanx. And this should run, because JBuilder created this for me.

http://img251.imageshack.us/my.php?image=1sk9.jpg
[ July 24, 2006: Message edited by: Keenan Staffieri ]

[Giovanni De Stefano]

...read the messages area: "No such method found: main" basically you either didn't write a main or it cannot be found!

If you post your code qould be much easier to debug!

Gio :-)

[Keenan Staffieri]

Yes, I saw that before, and know that a program needs a main(String[] args) to run if its an app. Yet I find it strange that it would not be there, I thought JBuilder would auto-create this so I could run it immeditaly and an intro.

CODE:

//PanelTest.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JToolBar;
import javax.swing.JButton;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
 
public class PanelTest extends JFrame {
    JPanel contentPane;
    BorderLayout borderLayout1 = new BorderLayout();
    JMenuBar jMenuBar1 = new JMenuBar();
    JMenu jMenuFile = new JMenu();
    JMenuItem jMenuFileExit = new JMenuItem();
    JMenu jMenuHelp = new JMenu();
    JMenuItem jMenuHelpAbout = new JMenuItem();
    JToolBar jToolBar = new JToolBar();
    JButton jButton1 = new JButton();
    JButton jButton2 = new JButton();
    JButton jButton3 = new JButton();
    ImageIcon image1 = new ImageIcon(PanelTest.class.getResource("openFile.png"));
    ImageIcon image2 = new ImageIcon(PanelTest.class.getResource(
            "closeFile.png"));
    ImageIcon image3 = new ImageIcon(PanelTest.class.getResource("help.png"));
    JLabel statusBar = new JLabel();
 
    public PanelTest() {
        try {
            setDefaultCloseOperation(EXIT_ON_CLOSE);
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }
 
    /**
     * Component initialization.
     *
     * @throws java.lang.Exception
     */
    private void jbInit() throws Exception {
        contentPane = (JPanel) getContentPane();
        contentPane.setLayout(borderLayout1);
        setSize(new Dimension(400, 300));
        setTitle("Keenan's PanelTest");
        statusBar.setText(" ");
        jMenuFile.setText("File");
        jMenuFileExit.setText("Exit");
        jMenuFileExit.addActionListener(new
                                        PanelTest_jMenuFileExit_ActionAdapter(this));
        jMenuHelp.setText("Help");
        jMenuHelpAbout.setText("About");
        jMenuHelpAbout.addActionListener(new
                                         PanelTest_jMenuHelpAbout_ActionAdapter(this));
        jMenuBar1.add(jMenuFile);
        jMenuFile.add(jMenuFileExit);
        jMenuBar1.add(jMenuHelp);
        jMenuHelp.add(jMenuHelpAbout);
        setJMenuBar(jMenuBar1);
        jButton1.setIcon(image1);
        jButton1.setToolTipText("Open File");
        jButton2.setIcon(image2);
        jButton2.setToolTipText("Close File");
        jButton3.setIcon(image3);
        jButton3.setToolTipText("Help");
        jToolBar.add(jButton1);
        jToolBar.add(jButton2);
        jToolBar.add(jButton3);
        contentPane.add(jToolBar, BorderLayout.NORTH);
        contentPane.add(statusBar, BorderLayout.SOUTH);
    }
 
    /**
     * File | Exit action performed.
     *
     * @param actionEvent ActionEvent
     */
    void jMenuFileExit_actionPerformed(ActionEvent actionEvent) {
        System.exit(0);
    }
 
    /**
     * Help | About action performed.
     *
     * @param actionEvent ActionEvent
     */
    void jMenuHelpAbout_actionPerformed(ActionEvent actionEvent) {
        PanelTest_AboutBox dlg = new PanelTest_AboutBox(this);
        Dimension dlgSize = dlg.getPreferredSize();
        Dimension frmSize = getSize();
        Point loc = getLocation();
        dlg.setLocation((frmSize.width - dlgSize.width) / 2 + loc.x,
                        (frmSize.height - dlgSize.height) / 2 + loc.y);
        dlg.setModal(true);
        dlg.pack();
        dlg.show();
    }
}
 

class PanelTest_jMenuFileExit_ActionAdapter implements ActionListener {
    PanelTest adaptee;
 
    PanelTest_jMenuFileExit_ActionAdapter(PanelTest adaptee) {
        this.adaptee = adaptee;
    }
 
    public void actionPerformed(ActionEvent actionEvent) {
        adaptee.jMenuFileExit_actionPerformed(actionEvent);
    }
}
 

class PanelTest_jMenuHelpAbout_ActionAdapter implements ActionListener {
    PanelTest adaptee;
 
    PanelTest_jMenuHelpAbout_ActionAdapter(PanelTest adaptee) {
        this.adaptee = adaptee;
    }
 
    public void actionPerformed(ActionEvent actionEvent) {
        adaptee.jMenuHelpAbout_actionPerformed(actionEvent);
    }
}

//PanelTest_AboutBox.java
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
import javax.swing.*;
 
public class PanelTest_AboutBox extends JDialog implements ActionListener {
    JPanel panel1 = new JPanel();
    JPanel panel2 = new JPanel();
    JPanel insetsPanel1 = new JPanel();
    JPanel insetsPanel2 = new JPanel();
    JPanel insetsPanel3 = new JPanel();
    JButton button1 = new JButton();
    JLabel imageLabel = new JLabel();
    JLabel label1 = new JLabel();
    JLabel label2 = new JLabel();
    JLabel label3 = new JLabel();
    JLabel label4 = new JLabel();
    ImageIcon image1 = new ImageIcon();
    BorderLayout borderLayout1 = new BorderLayout();
    BorderLayout borderLayout2 = new BorderLayout();
    FlowLayout flowLayout1 = new FlowLayout();
    GridLayout gridLayout1 = new GridLayout();
    String product = "";
    String version = "1.0";
    String copyright = "Copyright (c) 2006";
    String comments = "";
 
    public PanelTest_AboutBox(Frame parent) {
        super(parent);
        try {
            setDefaultCloseOperation(DISPOSE_ON_CLOSE);
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }
 
    public PanelTest_AboutBox() {
        this(null);
    }
 
    /**
     * Component initialization.
     *
     * @throws java.lang.Exception
     */
    private void jbInit() throws Exception {
        image1 = new ImageIcon(PanelTest.class.getResource("about.png"));
        imageLabel.setIcon(image1);
        setTitle("About");
        panel1.setLayout(borderLayout1);
        panel2.setLayout(borderLayout2);
        insetsPanel1.setLayout(flowLayout1);
        insetsPanel2.setLayout(flowLayout1);
        insetsPanel2.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
        gridLayout1.setRows(4);
        gridLayout1.setColumns(1);
        label1.setText(product);
        label2.setText(version);
        label3.setText(copyright);
        label4.setText(comments);
        insetsPanel3.setLayout(gridLayout1);
        insetsPanel3.setBorder(BorderFactory.createEmptyBorder(10, 60, 10, 10));
        button1.setText("OK");
        button1.addActionListener(this);
        insetsPanel2.add(imageLabel, null);
        panel2.add(insetsPanel2, BorderLayout.WEST);
        getContentPane().add(panel1, null);
        insetsPanel3.add(label1, null);
        insetsPanel3.add(label2, null);
        insetsPanel3.add(label3, null);
        insetsPanel3.add(label4, null);
        panel2.add(insetsPanel3, BorderLayout.CENTER);
        insetsPanel1.add(button1, null);
        panel1.add(insetsPanel1, BorderLayout.SOUTH);
        panel1.add(panel2, BorderLayout.NORTH);
        setResizable(true);
    }
 
    /**
     * Close the dialog on a button event.
     *
     * @param actionEvent ActionEvent
     */
    public void actionPerformed(ActionEvent actionEvent) {
        if (actionEvent.getSource() == button1) {
            dispose();
        }
    }
}

[Rusty Shackleford]

Why would it auto-create a main method? Would the IDE know what should be in main? Add main, and call Panel test from there.

Also show() is deprecated and should never be used, use setVisible(true) instead.
[ July 24, 2006: Message edited by: Rusty Shackleford ]

[Keenan Staffieri]

eh, nvm.

The tutorials I am utilizing work anyway.

When I said JBuilder made this, I meant it in that, when you create a new file in JBuilder it has stuff already there for you to compile and see, as a sample, but i find it weird it has no main.

[Joanne Neal]

Did you check the Generate Main Method option in the JBuilder New Class Wizard ?
Not all classes require a main method, therefore JBuilder is not going to create one unless you tell it to.