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Thread: Cant find main class swing

  1. #1
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    Default Cant find main class swing

    /*
     * To change this template, choose Tools | Templates
     * and open the template in the editor.
     */
    package swingarea;
     
    /**
     *
     * @author Logan
     */
    public class AreaCalculator extends javax.swing.JFrame {
     
        /**
         * Creates new form AreaCalculator
         */
        public AreaCalculator() {
            initComponents();
        }
     
        /**
         * This method is called from within the constructor to initialize the form.
         * WARNING: Do NOT modify this code. The content of this method is always
         * regenerated by the Form Editor.
         */
        @SuppressWarnings("unchecked")
        // <editor-fold defaultstate="collapsed" desc="Generated Code">
        private void initComponents() {
     
            buttonGroup1 = new javax.swing.ButtonGroup();
            dimension1Label = new javax.swing.JLabel();
            rectangleRadioButton = new javax.swing.JRadioButton();
            triangleRadioButton = new javax.swing.JRadioButton();
            dimension2Label = new javax.swing.JLabel();
            dimension1Text = new javax.swing.JTextField();
            dimension2Text = new javax.swing.JTextField();
            inchesLabel1 = new javax.swing.JLabel();
            inchesLabel2 = new javax.swing.JLabel();
            calcAreaButton = new javax.swing.JButton();
            areaLabel = new javax.swing.JLabel();
            outputLabel = new javax.swing.JLabel();
            circleRadioButton = new javax.swing.JRadioButton();
            jMenuBar1 = new javax.swing.JMenuBar();
            jMenu1 = new javax.swing.JMenu();
            clearMenuItem = new javax.swing.JMenu();
            exitMenuItem = new javax.swing.JMenu();
     
            setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
            setTitle("Area Calculator");
     
            dimension1Label.setText("Dimension 1:");
     
            buttonGroup1.add(rectangleRadioButton);
            rectangleRadioButton.setText("Rectangle");
     
            buttonGroup1.add(triangleRadioButton);
            triangleRadioButton.setText("Triangle");
     
            dimension2Label.setText("Dimension 2:");
     
            inchesLabel1.setText("inches");
     
            inchesLabel2.setText("inches");
     
            calcAreaButton.setText("Calculate Area");
            calcAreaButton.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    calcAreaButtonActionPerformed(evt);
                }
            });
     
            areaLabel.setText("Area is:");
     
            buttonGroup1.add(circleRadioButton);
            circleRadioButton.setText("Circle");
     
            jMenu1.setText("File");
            jMenuBar1.add(jMenu1);
     
            clearMenuItem.setText("Clear");
            clearMenuItem.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    clearMenuItemActionPerformed(evt);
                }
            });
            jMenuBar1.add(clearMenuItem);
     
            exitMenuItem.setText("Exit");
            exitMenuItem.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    exitMenuItemActionPerformed(evt);
                }
            });
            jMenuBar1.add(exitMenuItem);
     
            setJMenuBar(jMenuBar1);
     
            javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
            getContentPane().setLayout(layout);
            layout.setHorizontalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                                    .addComponent(circleRadioButton)
                                    .addComponent(dimension1Label))
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addGroup(layout.createSequentialGroup()
                                        .addComponent(dimension1Text, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                                        .addGap(18, 18, 18)
                                        .addComponent(inchesLabel1))
                                    .addGroup(layout.createSequentialGroup()
                                        .addComponent(rectangleRadioButton)
                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                        .addComponent(triangleRadioButton))))
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addGroup(layout.createSequentialGroup()
                                        .addGap(10, 10, 10)
                                        .addComponent(areaLabel))
                                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                                        .addComponent(calcAreaButton)
                                        .addComponent(outputLabel)))
                                .addGap(48, 48, 48)))
                        .addGroup(layout.createSequentialGroup()
                            .addComponent(dimension2Label)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                            .addComponent(dimension2Text, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGap(18, 18, 18)
                            .addComponent(inchesLabel2))))
            );
            layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(circleRadioButton)
                        .addComponent(rectangleRadioButton)
                        .addComponent(triangleRadioButton))
                    .addGap(41, 41, 41)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(dimension1Label)
                        .addComponent(dimension1Text, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(inchesLabel1))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(dimension2Label)
                        .addComponent(dimension2Text, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(inchesLabel2))
                    .addGap(31, 31, 31)
                    .addComponent(calcAreaButton)
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                    .addComponent(areaLabel)
                    .addGap(20, 20, 20)
                    .addComponent(outputLabel))
            );
     
            pack();
        }// </editor-fold>
     
        private void calcAreaButtonActionPerformed(java.awt.event.ActionEvent evt) {
            // TODO add your handling code here:
        }
     
        private void exitMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
            // TODO add your handling code here:
        }
     
        private void clearMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
            // TODO add your handling code here:
        }
     
        /**
         * @param args the command line arguments
         */
        public static void main(String args[]) {
            /* Set the Nimbus look and feel */
            //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
            /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
             * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
             */
            try {
                for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                    if ("Nimbus".equals(info.getName())) {
                        javax.swing.UIManager.setLookAndFeel(info.getClassName());
                        break;
                    }
                }
            } catch (ClassNotFoundException ex) {
                java.util.logging.Logger.getLogger(AreaCalculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
            } catch (InstantiationException ex) {
                java.util.logging.Logger.getLogger(AreaCalculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
            } catch (IllegalAccessException ex) {
                java.util.logging.Logger.getLogger(AreaCalculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
            } catch (javax.swing.UnsupportedLookAndFeelException ex) {
                java.util.logging.Logger.getLogger(AreaCalculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
            }
            //</editor-fold>
     
            /* Create and display the form */
            java.awt.EventQueue.invokeLater(new Runnable() {
                public void run() {
                    new AreaCalculator().setVisible(true);
                }
            });
        }
        // Variables declaration - do not modify
        private javax.swing.JLabel areaLabel;
        private javax.swing.ButtonGroup buttonGroup1;
        private javax.swing.JButton calcAreaButton;
        private javax.swing.JRadioButton circleRadioButton;
        private javax.swing.JMenu clearMenuItem;
        private javax.swing.JLabel dimension1Label;
        private javax.swing.JTextField dimension1Text;
        private javax.swing.JLabel dimension2Label;
        private javax.swing.JTextField dimension2Text;
        private javax.swing.JMenu exitMenuItem;
        private javax.swing.JLabel inchesLabel1;
        private javax.swing.JLabel inchesLabel2;
        private javax.swing.JMenu jMenu1;
        private javax.swing.JMenuBar jMenuBar1;
        private javax.swing.JLabel outputLabel;
        private javax.swing.JRadioButton rectangleRadioButton;
        private javax.swing.JRadioButton triangleRadioButton;
        // End of variables declaration
    }


  2. #2
    Member suyog53's Avatar
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    Default Re: Cant find main class swing

    What is the problem....?'
    The program runs correctly in my System...'

  3. #3
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    Default Re: Cant find main class swing

    It says cannot find main class when I try to run. This is a JFrame Swing project.

  4. #4
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    Default Re: Cant find main class swing

    Any help would be greatly appreciated, to sum up:
    The code is above, I have made a gui for my code but It isn't picking it up as the main. How do I set it as main? I followed a tutorial on oracle before this on swing, and it worked fine asking me to use the GUI as main, but now for whatever reason, it is not, how can i resolve this? Thanks ~ Logan Crone.

  5. #5
    Super Moderator copeg's Avatar
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    Default Re: Cant find main class swing

    You have to be more explicit as to how you are running the code. Is it in a jar? Are you using the command line? Are you using an IDE? Based upon the code, I'd bet you are using an IDE with a GUI editor (which I would recommend against unless you are familiar with constructing GUI's manually).

  6. #6
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    Default Re: Cant find main class swing

    Assignment says you have to use Netbeans IDE.

  7. #7
    Super Moderator copeg's Avatar
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    Default Re: Cant find main class swing

    I don't use netbeans, but there must be a way to set the class which contains the application entry point (main method). The code you posted contains a main method, so I'd recommend reviewing the docs on your IDE or searching the internet for instructions on how to set the main class in Netbeans. I'll move your thread to the IDE section.

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