341 lines
10 KiB
Java
341 lines
10 KiB
Java
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import java.awt.*;
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import java.awt.event.*;
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import javax.swing.*;
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import java.util.*;
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/*
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* The main work of the application is done in this JPanel-extending class.
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* This allows the java class to be run as a stand-alone application or
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* as an applet within a web browser.
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*/
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class RetirementCalculatorPanel extends JPanel implements ActionListener
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{
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private RetirementCalculatorModel myModel;
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private JComponent makeDivider() { return new JLabel(" "); }
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private HashMap<String, JComponent> myFields;
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private JButton myCalculateButton;
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private JButton myPrintButton;
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private JButton myResetButton;
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private JLabel myResultBox;
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private JTextField myNameField;
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class ComboChoice
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{
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private String myDesc;
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private int myVal;
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ComboChoice(int val, String desc)
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{
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myDesc = desc;
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myVal = val;
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}
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public String toString() { return myDesc; }
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public int getVal() { return myVal; }
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}
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private final ComboChoice[] retirement_age_choices = {
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new ComboChoice(55, "55"),
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new ComboChoice(60, "60"),
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new ComboChoice(65, "65"),
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new ComboChoice(70, "70")
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};
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private final ComboChoice[] life_expectancy_choices = {
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new ComboChoice(82, "82 (Male; 50th percentile)"),
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new ComboChoice(86, "86 (Female; 50th percentile)"),
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new ComboChoice(89, "89 (Male; 75th percentile)"),
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new ComboChoice(92, "92 (Female; 75th percentile)"),
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new ComboChoice(94, "94 (Male; 90th percentile)"),
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new ComboChoice(97, "97 (Female; 90th percentile)")
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};
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public RetirementCalculatorPanel()
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{
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super(new BorderLayout());
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myModel = new RetirementCalculatorModel();
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myFields = new HashMap<String, JComponent>();
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JPanel inner = new JPanel(new GridBagLayout());
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JComponent field;
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GridBagConstraints c = new GridBagConstraints();
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c.fill = GridBagConstraints.HORIZONTAL;
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c.ipadx = 2;
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c.gridwidth = 1;
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c.gridheight = 1;
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c.gridx = 0;
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c.gridy = 0;
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c.weightx = 0.0;
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inner.add(new JLabel("What is your name?", SwingConstants.RIGHT), c);
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c.gridx++;
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c.weightx = 1.0;
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myNameField = new JTextField();
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inner.add(myNameField, c);
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c.gridx--;
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c.gridy++;
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c.weightx = 0.0;
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inner.add(new JLabel("How much annual income will you want in retirement?", SwingConstants.RIGHT), c);
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c.gridx++;
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c.weightx = 1.0;
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field = new JTextField();
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myFields.put("income wanted", field);
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inner.add(field, c);
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c.gridx--;
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c.gridy++;
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c.weightx = 0.0;
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inner.add(new JLabel("What is your current annual income?",
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SwingConstants.RIGHT), c);
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c.gridx++;
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c.weightx = 1.0;
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field = new JTextField();
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myFields.put("current income", field);
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inner.add(field, c);
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c.gridx--;
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c.gridy++;
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c.gridwidth = 2;
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inner.add(makeDivider(), c);
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c.gridy++;
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inner.add(new JLabel("What is your expected annual income after retirement -"), c);
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c.gridwidth = 1;
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c.gridy++;
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c.weightx = 0.0;
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inner.add(new JLabel(" - from an employer pension plan?",
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SwingConstants.RIGHT), c);
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c.gridx++;
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c.weightx = 1.0;
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field = new JTextField();
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myFields.put("employer pension", field);
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inner.add(field, c);
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c.gridx--;
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c.gridy++;
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c.weightx = 0.0;
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inner.add(new JLabel(" - from a part-time job?",
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SwingConstants.RIGHT), c);
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c.gridx++;
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c.weightx = 1.0;
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field = new JTextField();
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myFields.put("part time income", field);
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inner.add(field, c);
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c.gridx--;
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c.gridy++;
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c.weightx = 0.0;
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inner.add(new JLabel(" - other?", SwingConstants.RIGHT), c);
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c.gridx++;
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c.weightx = 1.0;
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field = new JTextField();
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myFields.put("other income", field);
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inner.add(field, c);
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c.gridx--;
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c.gridy++;
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c.gridwidth = 2;
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inner.add(makeDivider(), c);
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c.gridwidth = 1;
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c.gridy++;
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c.weightx = 0.0;
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inner.add(new JLabel("How much savings do you have to date?",
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SwingConstants.RIGHT), c);
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c.gridx++;
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c.weightx = 1.0;
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field = new JTextField();
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myFields.put("savings", field);
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inner.add(field, c);
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c.gridx--;
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c.gridy++;
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c.weightx = 0.0;
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inner.add(new JLabel("At what age do you expect to retire?",
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SwingConstants.RIGHT), c);
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c.gridx++;
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c.weightx = 1.0;
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field = new JComboBox(retirement_age_choices);
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myFields.put("retirement age", field);
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inner.add(field, c);
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c.gridx--;
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c.gridy++;
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JPanel p = new JPanel(new BorderLayout());
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p.setAlignmentX(Component.RIGHT_ALIGNMENT);
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p.add(new JLabel("What is your life expectancy?",
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SwingConstants.RIGHT), BorderLayout.CENTER);
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field = new JComboBox(life_expectancy_choices);
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myFields.put("life expectancy", field);
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p.add(field, BorderLayout.EAST);
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c.gridwidth = 2;
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inner.add(p, c);
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c.gridwidth = 1;
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c.gridy++;
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c.gridwidth = 2;
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inner.add(makeDivider(), c);
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c.gridwidth = 1;
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c.gridy++;
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JPanel buttons = new JPanel();
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buttons.setLayout(new BoxLayout(buttons, BoxLayout.X_AXIS));
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buttons.add(Box.createHorizontalGlue());
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myCalculateButton = new JButton("Calculate");
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myCalculateButton.addActionListener(this);
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buttons.add(myCalculateButton);
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buttons.add(Box.createRigidArea(new Dimension(5, 0)));
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myPrintButton = new JButton("Print");
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myPrintButton.addActionListener(this);
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buttons.add(myPrintButton);
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buttons.add(Box.createRigidArea(new Dimension(5, 0)));
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myResetButton = new JButton("Reset");
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myResetButton.addActionListener(this);
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buttons.add(myResetButton);
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buttons.add(Box.createHorizontalGlue());
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c.gridwidth = 2;
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inner.add(buttons, c);
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c.gridwidth = 1;
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c.gridy++;
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c.gridwidth = 2;
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inner.add(makeDivider(), c);
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c.gridwidth = 1;
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c.gridy++;
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c.gridwidth = 2;
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myResultBox = new JLabel(" ", SwingConstants.CENTER);
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inner.add(myResultBox, c);
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c.gridwidth = 1;
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c.gridy++;
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JScrollPane scrollpane = new JScrollPane(inner,
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ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
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ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
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add(scrollpane);
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reset();
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}
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public void actionPerformed(ActionEvent e)
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{
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if (e.getSource() == myCalculateButton)
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calculate();
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else if (e.getSource() == myResetButton)
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reset();
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else if (e.getSource() == myPrintButton)
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print();
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}
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private void calculate()
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{
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Iterator it = myFields.keySet().iterator();
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while (it.hasNext())
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{
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String key = (String) it.next();
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JComponent comp = myFields.get(key);
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if (comp.getClass() == JTextField.class)
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{
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JTextField tf = (JTextField) comp;
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myModel.setField(key, Double.parseDouble(tf.getText()));
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}
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else if (comp.getClass() == JComboBox.class)
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{
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JComboBox cb = (JComboBox) comp;
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myModel.setField(key,
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((ComboChoice) cb.getSelectedItem()).getVal());
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}
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}
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myModel.calculate();
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myResultBox.setText("<html>The total amount of savings needed at retirement is $" +
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String.format("%,.02f", myModel.getField("total additional savings needed")) +
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".<br/> The annual amount of savings needed is $" +
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String.format("%,.02f", myModel.getField("annual savings needed")) + "</html>");
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}
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private void reset()
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{
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myModel.reset();
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Iterator it = myFields.keySet().iterator();
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while (it.hasNext())
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{
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String key = (String) it.next();
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JComponent comp = myFields.get(key);
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if (comp.getClass() == JTextField.class)
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{
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JTextField tf = (JTextField) comp;
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double val = myModel.getField(key);
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tf.setText((new Double(val)).toString());
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}
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else if (comp.getClass() == JComboBox.class)
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{
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JComboBox cb = (JComboBox) comp;
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int val = (int) myModel.getField(key);
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ComboChoice[] ccp = null;
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if (key.equals("retirement age"))
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ccp = retirement_age_choices;
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else if (key.equals("life expectancy"))
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ccp = life_expectancy_choices;
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if (ccp != null)
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{
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for (ComboChoice cc : ccp)
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{
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if (cc.getVal() == val)
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{
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cb.setSelectedItem(cc);
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break;
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}
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}
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}
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}
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}
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myNameField.setText("");
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}
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private void print()
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{
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calculate();
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}
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}
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/*
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* The "main" class of this file allows the app to be run as an applet
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* but also provides a "main" method to run as an application.
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*/
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public class RetirementCalculator extends JApplet
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{
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final static private String PROG_NAME = "Josh's Retirement Calculator";
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RetirementCalculatorPanel panel;
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public void init()
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{
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setLayout(new BorderLayout());
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panel = new RetirementCalculatorPanel();
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add(panel, BorderLayout.CENTER);
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}
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public static void main(String[] args)
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{
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javax.swing.SwingUtilities.invokeLater(new Runnable() {
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public void run()
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{
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JFrame frame = new JFrame(PROG_NAME);
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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RetirementCalculatorPanel panel =
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new RetirementCalculatorPanel();
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frame.getContentPane().add(panel);
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frame.setPreferredSize(new Dimension(600, 450));
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frame.pack();
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frame.setVisible(true);
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}
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});
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}
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}
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