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POGUI program pictures change with drop down menu action java
 

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  1. POGUI program pictures change with drop down menu action java
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    <p>I have written a program that calculates miles per gallon entered. it can also switch to km with a drop down menu. I am trying to make it so that when I select the drop down menu that the picture can switch each time I switch. so a different picture for miles and different one for km. its silly but its one of the requirements of the assignment. how do I go about doing that? here is what i currently have, I just want the picture to change between two I have. </p> <pre><code>import java.awt.Component; import java.awt.event.*; import java.awt.*; import javax.swing.*; import static javax.swing.GroupLayout.Alignment.*; import net.miginfocom.swing.MigLayout; import javax.imageio.ImageIO; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; public class mpg_mig extends JFrame { public mpg_mig() { JLabel titleLabel = new JLabel("Fuel Calculator"); titleLabel.setFont(new Font("Serif", Font.BOLD, 18)); titleLabel.setForeground(Color.blue); final JLabel distLabel = new JLabel("Miles:"); final JTextField distText = new JTextField(10); JLabel traveledLabel = new JLabel("traveled"); final JLabel fuelLabel = new JLabel("Gas:"); final JTextField fuelText = new JTextField(10); final JLabel mpgLabel = new JLabel("Miles per gallon:"); final JTextField mpgText = new JTextField(10); JButton clearButton = new JButton("Clear"); JButton calcButton = new JButton("Calculate"); String[] actStrings = { "Miles", "kiloMeters" }; JComboBox jComboBox1 = new JComboBox(actStrings); jComboBox1.setEditable(true); String sFileName = "circuit1.png"; BufferedImage image = null; try { image = ImageIO.read(new File(sFileName)); } catch (IOException ex) { System.out.println (ex.toString()); System.out.println(sFileName); JOptionPane.showMessageDialog(null,ex.toString() + " " + sFileName); System.exit(0); } JLabel labelPic1 = new JLabel(new ImageIcon(image)); setResizable( false ); JPanel p = new JPanel(new MigLayout("", "[] [] []", "[] [] [] [] []")); p.setBackground(Color.WHITE); setContentPane(p); p.add(labelPic1, "cell 0 0 1 3"); //(column 0, row 0, width 1, height 3) p.add(clearButton, "cell 0 3"); //(column 0, row 3) p.add(calcButton, "cell 0 4"); //(column 0, row 4) p.add(titleLabel, "cell 1 0"); //(column 1, row 0) p.add(distLabel, "cell 1 1"); //(column 1, row 1) p.add(fuelLabel, "cell 1 2"); //(column 1, row 2) p.add(mpgLabel, "cell 1 3"); //(column 1, row 3) p.add(jComboBox1, "cell 1 4"); //(column 1, row 4) p.add(distText, "cell 2 1"); //(column 2, row 1) p.add(fuelText, "cell 2 2"); //(column 2, row 2) p.add(mpgText, "cell 2 3"); //(column 2, row 3) clearButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { distText.setText(""); fuelText.setText(""); mpgText.setText(""); } }); calcButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { if(isNumeric(distText.getText()) &amp;&amp; isNumeric(fuelText.getText())) { double fuel; double dist; double result; fuel = Double.parseDouble(fuelText.getText()); dist = Double.parseDouble(distText.getText()); result = dist/fuel; result = Round(result,2); mpgText.setText(String.format("%f", result)); } else { JOptionPane.showMessageDialog(null, "Enter distance traveled and fuel used"); } } }); jComboBox1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { //JComboBox jComboBox1 = (JComboBox)event.getSource(); JComboBox jComboBox1 = (JComboBox)event.getSource(); if(jComboBox1.getSelectedItem() == "Miles") { distLabel.setText("Miles"); mpgLabel.setText("Miles per gallon:"); } else { distLabel.setText("KiloMeters"); mpgLabel.setText("KM per liter:"); } } }); setTitle("MPG and KML"); pack(); //pack disables setting frames size... setLocationRelativeTo(null);//center frame and showMessageDialog setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); } private static boolean isNumeric(String text) { try { Double.parseDouble(text); } catch (Exception e) { return false; } return true; } public double Round(double val, int plc) { double pwr = Math.pow(10,plc); val = val * pwr; //shift to the left double tmp = (int) val; if( ((int)(val + .5)) == (int) val) return (tmp/pwr); //don't round up else return((tmp + 1.0)/pwr); //round up } public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { try { UIManager.setLookAndFeel( UIManager.getCrossPlatformLookAndFeelClassName()); } catch (Exception ex) { ex.printStackTrace(); } new mpg_mig().setVisible(true); } }); } } </code></pre>
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    1. CO*"its silly but its one of the requirements of the assignment."* I am surprised that MigLayout is allowed in the code.
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