Main.java Source code

Introduction

Here is the source code for Main.java

Source

import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import java.awt.event.ActionEvent;
import java.text.DecimalFormat;

public class Main extends JFrame {
    public static void main(String[] args) {
        DecimalFormat format = new DecimalFormat("####.##");
        format.setMinimumFractionDigits(2);
        final JFormattedTextField field1 = new JFormattedTextField(format);
        final JFormattedTextField field2 = new JFormattedTextField(format);
        field1.setColumns(15);
        field2.setColumns(15);
        JButton btn = new JButton(new AbstractAction("Multiply by 2") {

            @Override
            public void actionPerformed(ActionEvent e) {
                Number value = (Number) field1.getValue();
                if (value != null) {
                    field2.setValue(2 * value.doubleValue());
                }
            }
        });

        JPanel panel = new JPanel();
        panel.add(field1);
        panel.add(btn);
        panel.add(field2);
        JOptionPane.showMessageDialog(null, panel);
    }
}