<![CDATA[/*
* Gary Cornell and Cay S. Horstmann, Core Java (Book/CD-ROM)
* Published By SunSoft Press/Prentice-Hall
* Copyright (C) 1996 Sun Microsystems Inc.
* All Rights Reserved. ISBN 0-13-565755-5
*
* Permission to use, copy, modify, and distribute this
* software and its documentation for NON-COMMERCIAL purposes
* and without fee is hereby granted provided that this
* copyright notice appears in all copies.
*
* THE AUTHORS AND PUBLISHER MAKE NO REPRESENTATIONS OR
* WARRANTIES ABOUT THE SUITABILITY OF THE SOFTWARE, EITHER
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. THE AUTHORS
* AND PUBLISHER SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED
* BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
* THIS SOFTWARE OR ITS DERIVATIVES.
*/
/**
* @version 1.00 07 Feb 1996
* @author Cay Horstmann
*/
import java.awt.*;
import java.applet.*;
import java.io.*;
import corejava.*;
public class Retire extends Applet
{ public void init()
{ GridBagLayout gbl = new GridBagLayout();
setLayout(gbl);
GridBagConstraints gbc = new GridBagConstraints();
gbc.fill = GridBagConstraints.BOTH;
gbc.weightx = 100;
gbc.weighty = 100;
add(new Label("Prior Savings"), gbl, gbc, 0, 0, 1, 1);
add(savingsField, gbl, gbc, 1, 0, 1, 1);
add(new Label("Annual Contribution"),
gbl, gbc, 2, 0, 1, 1);
add(contribField, gbl, gbc, 3, 0, 1, 1);
add(new Label("Retirement Income"),
gbl, gbc, 4, 0, 1, 1);
add(incomeField, gbl, gbc, 5, 0, 1, 1);
add(new Label("Current Age"), gbl, gbc, 0, 1, 1, 1);
add(currentAgeField, gbl, gbc, 1, 1, 1, 1);
add(new Label("Retirement Age"), gbl, gbc, 2, 1, 1, 1);
add(retireAgeField, gbl, gbc, 3, 1, 1, 1);
add(new Label("Life Expectancy"), gbl, gbc, 4, 1, 1, 1);
add(deathAgeField, gbl, gbc, 5, 1, 1, 1);
add(new Label("% Inflation"), gbl, gbc, 0, 2, 1, 1);
add(inflationPercentField, gbl, gbc, 1, 2, 1, 1);
add(new Label("% Invest Return"), gbl, gbc, 2, 2, 1, 1);
add(investPercentField, gbl, gbc, 3, 2, 1, 1);
add(new Button("Compute"), gbl, gbc, 5, 2, 1, 1);
add(retireCanvas, gbl, gbc, 0, 3, 4, 1);
add(retireText, gbl, gbc, 4, 3, 2, 1);
retireText.setEditable(false);
retireText.setFont(new Font("Courier", Font.PLAIN, 10));
}
private void add(Component c, GridBagLayout gbl,
GridBagConstraints gbc, int x, int y, int w, int h)
{ gbc.gridx = x;
gbc.gridy = y;
gbc.gridwidth = w;
gbc.gridheight = h;
gbl.setConstraints(c, gbc);
add(c);
}
public boolean action(Event evt, Object arg)
{ if (arg.equals("Compute"))
{ if (savingsField.isValid()
&& contribField.isValid()
&& incomeField.isValid()
&& currentAgeField.isValid()
&& retireAgeField.isValid()
&& deathAgeField.isValid()
&& inflationPercentField.isValid()
&& investPercentField.isValid())
{ RetireInfo info = new RetireInfo();
info.savings = savingsField.getValue();
info.contrib = contribField.getValue();
info.income = incomeField.getValue();
info.currentAge = currentAgeField.getValue();
info.retireAge = retireAgeField.getValue();
info.deathAge = deathAgeField.getValue();
info.inflationPercent
= inflationPercentField.getValue();
info.investPercent
= investPercentField.getValue();
retireCanvas.redraw(info);
int i;
retireText.setText("");
for (i = info.currentAge; i <= info.deathAge; i++)
{ retireText.appendText(
new Format("Age: %3d").form(i)
+ new Format(" Balance: %8d\n")
.form(info.getBalance(i)));
}
}
}
else return super.action(evt, arg);
return true;
}
private IntTextField savingsField
= new IntTextField(0, 0, 10000000, 10);
private IntTextField contribField
= new IntTextField(9000, 0, 1000000, 10);
private IntTextField incomeField
= new IntTextField(0, 0, 1000000, 10);
private IntTextField currentAgeField
= new IntTextField(0, 0, 150, 4);
private IntTextField retireAgeField
= new IntTextField(65, 0, 150, 4);
private IntTextField deathAgeField
= new IntTextField(85, 0, 150, 4);
private IntTextField inflationPercentField
= new IntTextField(5, 0, 1000, 4);
private IntTextField investPercentField
= new IntTextField(10, 0, 1000, 4);
private RetireCanvas retireCanvas = new RetireCanvas();
private TextArea retireText = new TextArea(10, 25);
}
class RetireInfo
{ public int getBalance(int year)
{ if (year < currentAge) return 0;
else if (year == currentAge)
{ age = year;
balance = savings;
return balance;
}
else if (year == age)
return balance;
if (year != age + 1)
getBalance(year - 1);
age = year;
if (age < retireAge)
balance += contrib;
else
balance -= income;
balance = (int)(balance
* (1 + (investPercent - inflationPercent) / 100.0));
return balance;
}
int savings;
int contrib;
int income;
int currentAge;
int retireAge;
int deathAge;
int inflationPercent;
int investPercent;
private int age;
private int balance;
}
class RetireCanvas extends Canvas
{ public RetireCanvas()
{ resize(400, 200);
}
public void redraw(RetireInfo newInfo)
{ info = newInfo;
repaint();
}
public void paint(Graphics g)
{ if (info == null) return;
int minValue = 0;
int maxValue = 0;
int i;
for (i = info.currentAge; i <= info.deathAge; i++)
{ int v = info.getBalance(i);
if (minValue > v) minValue = v;
if (maxValue < v) maxValue = v;
}
if (maxValue == minValue) return;
Dimension d = size();
int barWidth = d.width / (info.deathAge
- info.currentAge + 1);
double scale = (double)d.height
/ (maxValue - minValue);
for (i = info.currentAge; i <= info.deathAge; i++)
{ int x1 = (i - info.currentAge) * barWidth + 1;
int y1;
int v = info.getBalance(i);
int height;
int yOrigin = (int)(maxValue * scale);
if (v >= 0)
{ y1 = (int)((maxValue - v) * scale);
height = yOrigin - y1;
}
else
{ y1 = yOrigin;
height = (int)(-v * scale);
}
if (i < info.retireAge)
g.setColor(Color.blue);
else if (v >= 0)
g.setColor(Color.green);
else
g.setColor(Color.red);
g.fillRect(x1, y1, barWidth - 2, height);
g.setColor(Color.black);
g.drawRect(x1, y1, barWidth - 2, height);
}
}
private RetireInfo info = null;
}
]]>