Applet won't exit, throws exception...help
The exit button won't close my applet for some reason. I'm getting security permission exceptions.
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import java.awt.Button;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Insets;
import java.awt.Label;
import java.awt.LayoutManager;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JOptionPane;
import java.text.*;
import java.awt.Choice;
publicclass MortgageAppletGUIextends Applet{
Button calculateButton;
Button clearButton;
Button exitButton;
TextField principalField;
TextField interestField;
TextField termField;
TextArea displayArea;
Label principal;
Label term;
Label interest;
Image house;
Font title =new Font("TimesRoman", Font.BOLD, 16);
Font text =new Font("Courier", Font.BOLD, 12);
double monthlyInt;
double monthlyPayment;
int months=12;
double interestPayment;
double principalPayment;
double remainingBalance;
Choice principalChoice;
Choice interestChoice;
Choice termChoice;
publicvoid init(){
MortgageAppletLayout customLayout =new MortgageAppletLayout();
setFont(new Font("Helvetica", Font.PLAIN, 12));
setLayout(customLayout);
calculateButton =new Button("Calculate");
calculateButton.addActionListener(new CalculateActionListener());
add(calculateButton);
displayArea =new TextArea();
add(displayArea);
principal =new Label("Principal");
add(principal);
interest =new Label("Interest");
add(interest);
term =new Label("Term");
add(term);
clearButton =new Button("Clear");
clearButton.addActionListener(new CancelActionListener());
add(clearButton);
principalField =new TextField(20);
add(principalField);
interestField =new TextField(20);
add(interestField);
termField =new TextField(20);
add(termField);
principalChoice =new Choice();
principalChoice.addItem("200000");
principalChoice.addItemListener(new ChoicePrincipal());
add(principalChoice);
interestChoice =new Choice();
interestChoice.addItem("5.35");
interestChoice.addItem("5.5");
interestChoice.addItem("5.75");
interestChoice.addItemListener(new ChoiceInterest());
add(interestChoice);
termChoice =new Choice();
termChoice.addItem("7");
termChoice.addItem("15");
termChoice.addItem("30");
termChoice.addItemListener(new ChoiceTerm());
add(termChoice);
exitButton =new Button("Exit");
exitButton.addActionListener(new ExitActionListener());
add(exitButton);
setSize(getPreferredSize());
house = getImage(getCodeBase(),"house.jpg");
}
class CalculateActionListenerimplements ActionListener{
publicvoid actionPerformed(ActionEvent e){
NumberFormat Currency = NumberFormat.getCurrencyInstance();
String userInputprincipal = principalField.getText();
String userInputinterest = interestField.getText();
String userInputterm = termField.getText();
double userInputprincipalD=0;
double userInputinterestD=0;
double userInputtermD=0;
try{
userInputprincipalD = Double.parseDouble(userInputprincipal);
}catch (Exception ex){
JOptionPane.showMessageDialog(null,"Error principalField","Exception 01", JOptionPane.ERROR_MESSAGE);
principalField.requestFocus();
return;
}
try{
userInputinterestD = Double.parseDouble(userInputinterest);
}catch (Exception ex){
JOptionPane.showMessageDialog(null,"Error interestField","Exception 02", JOptionPane.ERROR_MESSAGE);
interestField.requestFocus();
return;
}
try{
userInputtermD = Double.parseDouble(userInputterm);
}catch (Exception ex){
JOptionPane.showMessageDialog(null,"Error termField","Exception 03", JOptionPane.ERROR_MESSAGE);
termField.requestFocus();
return;
}
// Display principal, interest, and loan balance of entire term
double monthlyInt;
double monthlyPayment;
double interestPayment;
double principalPayment;
double remainingBalance;
double months = userInputtermD * 12;
monthlyInt = (userInputinterestD / 100) / 12;
monthlyPayment = (userInputprincipalD * monthlyInt) / (1 - Math.pow(1 / (1 + monthlyInt), userInputtermD * 12));
for (int i = 1; i <= months; ++i){
interestPayment = userInputprincipalD * monthlyInt;
principalPayment = monthlyPayment - interestPayment;
remainingBalance = userInputprincipalD - principalPayment;
displayArea.append("\n#" + i +"\tP=" + Currency.format(principalPayment) +"\tI=" + Currency.format(interestPayment)
+"\tB=" + Currency.format(remainingBalance) +"\n");
userInputprincipalD -= principalPayment;// calculate until payments are done
}
}
}
class CancelActionListenerimplements ActionListener{
publicvoid actionPerformed(ActionEvent e){
principalField.setText("");
interestField.setText("");
termField.setText("");
displayArea.setText("");
}
}
class ExitActionListenerimplements ActionListener{
publicvoid actionPerformed(ActionEvent e){
System.exit(0);
}
}
class ChoicePrincipalimplements ItemListener{
publicvoid itemStateChanged(ItemEvent ie){
Choice cb1 = (Choice)ie.getSource();// the source of the event is the combo box
String principalC = (String)cb1.getSelectedItem();
principalField.setText(principalC);
}
}
class ChoiceInterestimplements ItemListener{
publicvoid itemStateChanged(ItemEvent ie){
Choice cb1 = (Choice)ie.getSource();// the source of the event is the combo box
String interestC = (String)cb1.getSelectedItem();
interestField.setText(interestC);
}
}
class ChoiceTermimplements ItemListener{
publicvoid itemStateChanged(ItemEvent ie){
Choice cb1 = (Choice)ie.getSource();// the source of the event is the combo box
String termC = (String)cb1.getSelectedItem();
termField.setText(termC);
}
}
publicvoid paint(Graphics g){
// Display program info
g.drawImage(house, 10, 5,this);
g.setColor(Color.green);
g.drawLine(20, 4, 230, 4);
g.setColor(Color.red);
g.setFont(title);
g.drawString("\tMortgage Loan Calculator", 10, 17);
g.setColor(Color.black);
g.setFont(text);
g.drawString("\tCreated by Me", 10, 30);
}
publicstaticvoid main(String args[]){
MortgageAppletGUI applet =new MortgageAppletGUI();
Frame window =new Frame("MortgageApplet");
window.addWindowListener(new WindowAdapter(){
publicvoid windowClosing(WindowEvent e){
System.exit(0);
}
});
applet.init();
window.add("Center", applet);
window.pack();
window.setVisible(true);
}
}
class MortgageAppletLayoutimplements LayoutManager{
public MortgageAppletLayout(){
}
publicvoid addLayoutComponent(String name, Component comp){
}
publicvoid removeLayoutComponent(Component comp){
}
public Dimension preferredLayoutSize(Container parent){
Dimension dim =new Dimension(0, 0);
Insets insets = parent.getInsets();
dim.width = 648 + insets.left + insets.right;
dim.height = 375 + insets.top + insets.bottom;
return dim;
}
public Dimension minimumLayoutSize(Container parent){
Dimension dim =new Dimension(0, 0);
return dim;
}
publicvoid layoutContainer(Container parent){
Insets insets = parent.getInsets();
Component c;
c = parent.getComponent(0);
if (c.isVisible()){c.setBounds(insets.left+8,insets.top+280,72,24);}
c = parent.getComponent(1);
if (c.isVisible()){c.setBounds(insets.left+248,insets.top+88,328,216);}
c = parent.getComponent(2);
if (c.isVisible()){c.setBounds(insets.left+8,insets.top+104,72,24);}
c = parent.getComponent(3);
if (c.isVisible()){c.setBounds(insets.left+8,insets.top+152,72,24);}
c = parent.getComponent(4);
if (c.isVisible()){c.setBounds(insets.left+8,insets.top+128,72,24);}
c = parent.getComponent(5);
if (c.isVisible()){c.setBounds(insets.left+88,insets.top+280,72,24);}
c = parent.getComponent(6);
if (c.isVisible()){c.setBounds(insets.left+80,insets.top+104,72,24);}
c = parent.getComponent(7);
if (c.isVisible()){c.setBounds(insets.left+80,insets.top+128,72,24);}
c = parent.getComponent(8);
if (c.isVisible()){c.setBounds(insets.left+80,insets.top+152,72,24);}
c = parent.getComponent(9);
if (c.isVisible()){c.setBounds(insets.left+152,insets.top+104,72,24);}
c = parent.getComponent(10);
if (c.isVisible()){c.setBounds(insets.left+152,insets.top+128,72,24);}
c = parent.getComponent(11);
if (c.isVisible()){c.setBounds(insets.left+152,insets.top+152,72,24);}
c = parent.getComponent(12);
if (c.isVisible()){c.setBounds(insets.left+172,insets.top+280,50,24);}
}
}
