Java: JOptionPane Example

This example covers following topics:

• How we can use JOptionPane to display a message dialog
• How to get user input through JOptionPane
• How to use a custom JPanel on the JOptionPane
• How to work on the user input data

Here goes the program

public class JOptionPaneExample

{

private double price;

private JTextField priceField;

private JLabel priceLabel;

public JOptionPaneExample()

{

priceField = new JTextField(10);

}

public void createAndDisplayGUI()

{

int selection = JOptionPane.showConfirmDialog(null, getPanel(), "Price Form : ", JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);

if (selection == JOptionPane.OK_OPTION) // if the use entered data and pressed OK

{

price = Double.valueOf(priceField.getText());

JOptionPane.showMessageDialog(null, "Price is : " + Double.toString(price), "Price : ", JOptionPane.PLAIN_MESSAGE);

}

else if (selection == JOptionPane.CANCEL_OPTION) // if the user pressed cancel button

{

// Do something here.

}

}

private JPanel getPanel()

{

JPanel basePanel = new JPanel();

basePanel.setOpaque(true);

basePanel.setBackground(Color.BLUE.darker());

JPanel centerPanel = new JPanel();

centerPanel.setLayout(new GridLayout(3, 2, 5, 5));

centerPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));

centerPanel.setOpaque(true);

centerPanel.setBackground(Color.WHITE);

priceLabel = new JLabel("Enter Price : ");

centerPanel.add(priceLabel);

centerPanel.add(priceField);

basePanel.add(centerPanel);

return basePanel;

}

}

Don't forget to import and write the driver program yourself. Here's the output from the program