Creating multiple windows from an applet

[tudyfruity18]

I'm suppose to write an applet that contains two buttons Investment calculator and Loan Calculator. When the Investment Calculator button is clicked, a frame appears in a new window for calculating future investment values. When you click Loan Calculator button, a frame appears in a separate new window for computong loan payments.

Here's my coding:

// Lab3.java:
import java.awt.*;
import java.awt.event. *;
import javax.swing.*;

public class Lab3 extends JApplet implements ActionListener {
private Investment investmentFrame = new Investment();
private JFrame loanFrame = new JFrame("Loan Calculator");
private JButton jbtInvestment = new JButton("Invest ment Calculator");
private JButton jbtLoan = new JButton("Loan Calculator");

public void init() {
getContentPane( ).setLayout(new FlowLayout());
getContentPane( ).add(jbtInvest ment);
getContentPane( ).add(jbtLoan);
jbtInvestment.a ddActionListene r(this);
jbtLoan.addActi onListener(this );
}

public void actionPerformed (ActionEvent e) {
if (e.getSource() == jbtInvestment) {
investmentFrame .setSize(300, 200);
investmentFrame .setTitle("Inve stment Calculator");
investmentFrame .setVisible(tru e);
}
else if (e.getSource() == jbtLoan) {
loanFrame.setSi ze(300, 200);
LoanApplet applet = new LoanApplet();
loanFrame.getCo ntentPane().add (applet);
applet.init();
loanFrame.setVi sible(true);
}
}
public static void main(String[] args) {
//Create a frame
JFrame frame = new JFrame("Lab3");

//Create an instance of the applet
Lab3 applet = new Lab3();

//Add the applet to the frame
frame.add(apple t, BorderLayout.CE NTER);

//Invoke init and start
applet.init();
applet.start();

//Display the frame
frame.setLocati onRelativeTo(nu ll);
frame.setDefaul tCloseOperation (JFrame.EXIT_ON _CLOSE);
frame.setSize(3 00, 300);
frame.setVisibl e(true);
}
}



Here's the coding for the LoanApplet:

import java.awt.*;
import java.awt.event. *;
import javax.swing.*;
import javax.swing.bor der.TitledBorde r;

public class LoanApplet extends JApplet {
// Declare and create text fields for interest rate
// year, loan amount, monthly payment, and total payment
private JTextField jtfAnnualIntere stRate = new JTextField();
private JTextField jtfNumberOfYear s = new JTextField();
private JTextField jtfLoanAmount = new JTextField();
private JTextField jtfMonthlyPayme nt = new JTextField();
private JTextField jtfTotalPayment = new JTextField();

// Declare and create a Compute Payment button
private JButton jbtComputeLoan = new JButton("Comput e Payment");

/** Initialize user interface */
public void init() {
// Set properties on the text fields
jtfMonthlyPayme nt.setEditable( false);
jtfTotalPayment .setEditable(fa lse);

// Right align text fields
jtfAnnualIntere stRate.setHoriz ontalAlignment( JTextField.RIGH T);
jtfNumberOfYear s.setHorizontal Alignment(JText Field.RIGHT);
jtfLoanAmount.s etHorizontalAli gnment(JTextFie ld.RIGHT);
jtfMonthlyPayme nt.setHorizonta lAlignment(JTex tField.RIGHT);
jtfTotalPayment .setHorizontalA lignment(JTextF ield.RIGHT);

// Panel p1 to hold labels and text fields
JPanel p1 = new JPanel(new GridLayout(5, 2));
p1.add(new JLabel("Annual Interest Rate"));
p1.add(jtfAnnua lInterestRate);
p1.add(new JLabel("Number of Years"));
p1.add(jtfNumbe rOfYears);
p1.add(new JLabel("Loan Amount"));
p1.add(jtfLoanA mount);
p1.add(new JLabel("Monthly Payment"));
p1.add(jtfMonth lyPayment);
p1.add(new JLabel("Total Payment"));
p1.add(jtfTotal Payment);
p1.setBorder(ne w
TitledBorder("E nter interest rate, year and loan amount"));

// Panel p2 to hold the button
JPanel p2 = new JPanel(new FlowLayout(Flow Layout.RIGHT));
p2.add(jbtCompu teLoan);

// Add the components to the applet
add(p1, BorderLayout.CE NTER);
add(p2, BorderLayout.SO UTH);

// Register listener
jbtComputeLoan. addActionListen er(new ButtonListener( ));
}

/** Handle the Compute Payment button */
private class ButtonListener implements ActionListener {
public void actionPerformed (ActionEvent e) {
// Get values from text fields
double interest =
Double.parseDou ble(jtfAnnualIn terestRate.getT ext());
int year =
Integer.parseIn t(jtfNumberOfYe ars.getText());
double loanAmount =
Double.parseDou ble(jtfLoanAmou nt.getText());

// Create a loan object
Loan loan = new Loan(interest, year, loanAmount);

// Display monthly payment and total payment
jtfMonthlyPayme nt.setText(Stri ng.format("%.2f ",
loan.getMonthly Payment()));
jtfTotalPayment .setText(String .format("%.2f",
loan.getTotalPa yment()));
}
}

public static void main(String[] args) {
// Create a frame
JFrame frame = new JFrame("Applet is in the frame");

// Create an instance of the applet
LoanApplet applet = new LoanApplet();

// Add the applet to the frame
frame.add(apple t, BorderLayout.CE NTER);

// Invoke applet's init method
applet.init();

// Display the frame
frame.setLocati onRelativeTo(nu ll); // Center the frame
frame.setDefaul tCloseOperation (JFrame.EXIT_ON _CLOSE);
frame.setSize(3 00, 300);
frame.setVisibl e(true);
}
}



Here's my command results I don't see what I'm doing wrong please help:

K:\Lab3.java:28 : cannot find symbol
symbol : class LoanApplet
location: class Lab3
LoanApplet applet = new LoanApplet();
^
K:\Lab3.java:28 : cannot find symbol
symbol : class LoanApplet
location: class Lab3
LoanApplet applet = new LoanApplet();
^
2 errors

Tool completed with exit code 1

[r035198x]

I'm suppose to write an applet that contains two buttons Investment calculator and Loan Calculator. When the Investment Calculator button is clicked, a frame appears in a new window for calculating future investment values. When you click Loan Calculator button, a frame appears in a separate new window for computong loan payments.

Here's my coding:

// Lab3.java:
import java.awt.*;
import java.awt.event. *;
import javax.swing.*;

public class Lab3 extends JApplet implements ActionListener {
private Investment investmentFrame = new Investment();
private JFrame loanFrame = new JFrame("Loan Calculator");
private JButton jbtInvestment = new JButton("Invest ment Calculator");
private JButton jbtLoan = new JButton("Loan Calculator");

public void init() {
getContentPane( ).setLayout(new FlowLayout());
getContentPane( ).add(jbtInvest ment);
getContentPane( ).add(jbtLoan);
jbtInvestment.a ddActionListene r(this);
jbtLoan.addActi onListener(this );
}

public void actionPerformed (ActionEvent e) {
if (e.getSource() == jbtInvestment) {
investmentFrame .setSize(300, 200);
investmentFrame .setTitle("Inve stment Calculator");
investmentFrame .setVisible(tru e);
}
else if (e.getSource() == jbtLoan) {
loanFrame.setSi ze(300, 200);
LoanApplet applet = new LoanApplet();
loanFrame.getCo ntentPane().add (applet);
applet.init();
loanFrame.setVi sible(true);
}
}
public static void main(String[] args) {
//Create a frame
JFrame frame = new JFrame("Lab3");

//Create an instance of the applet
Lab3 applet = new Lab3();

//Add the applet to the frame
frame.add(apple t, BorderLayout.CE NTER);

//Invoke init and start
applet.init();
applet.start();

//Display the frame
frame.setLocati onRelativeTo(nu ll);
frame.setDefaul tCloseOperation (JFrame.EXIT_ON _CLOSE);
frame.setSize(3 00, 300);
frame.setVisibl e(true);
}
}



Here's the coding for the LoanApplet:

import java.awt.*;
import java.awt.event. *;
import javax.swing.*;
import javax.swing.bor der.TitledBorde r;

public class LoanApplet extends JApplet {
// Declare and create text fields for interest rate
// year, loan amount, monthly payment, and total payment
private JTextField jtfAnnualIntere stRate = new JTextField();
private JTextField jtfNumberOfYear s = new JTextField();
private JTextField jtfLoanAmount = new JTextField();
private JTextField jtfMonthlyPayme nt = new JTextField();
private JTextField jtfTotalPayment = new JTextField();

// Declare and create a Compute Payment button
private JButton jbtComputeLoan = new JButton("Comput e Payment");

/** Initialize user interface */
public void init() {
// Set properties on the text fields
jtfMonthlyPayme nt.setEditable( false);
jtfTotalPayment .setEditable(fa lse);

// Right align text fields
jtfAnnualIntere stRate.setHoriz ontalAlignment( JTextField.RIGH T);
jtfNumberOfYear s.setHorizontal Alignment(JText Field.RIGHT);
jtfLoanAmount.s etHorizontalAli gnment(JTextFie ld.RIGHT);
jtfMonthlyPayme nt.setHorizonta lAlignment(JTex tField.RIGHT);
jtfTotalPayment .setHorizontalA lignment(JTextF ield.RIGHT);

// Panel p1 to hold labels and text fields
JPanel p1 = new JPanel(new GridLayout(5, 2));
p1.add(new JLabel("Annual Interest Rate"));
p1.add(jtfAnnua lInterestRate);
p1.add(new JLabel("Number of Years"));
p1.add(jtfNumbe rOfYears);
p1.add(new JLabel("Loan Amount"));
p1.add(jtfLoanA mount);
p1.add(new JLabel("Monthly Payment"));
p1.add(jtfMonth lyPayment);
p1.add(new JLabel("Total Payment"));
p1.add(jtfTotal Payment);
p1.setBorder(ne w
TitledBorder("E nter interest rate, year and loan amount"));

// Panel p2 to hold the button
JPanel p2 = new JPanel(new FlowLayout(Flow Layout.RIGHT));
p2.add(jbtCompu teLoan);

// Add the components to the applet
add(p1, BorderLayout.CE NTER);
add(p2, BorderLayout.SO UTH);

// Register listener
jbtComputeLoan. addActionListen er(new ButtonListener( ));
}

/** Handle the Compute Payment button */
private class ButtonListener implements ActionListener {
public void actionPerformed (ActionEvent e) {
// Get values from text fields
double interest =
Double.parseDou ble(jtfAnnualIn terestRate.getT ext());
int year =
Integer.parseIn t(jtfNumberOfYe ars.getText());
double loanAmount =
Double.parseDou ble(jtfLoanAmou nt.getText());

// Create a loan object
Loan loan = new Loan(interest, year, loanAmount);

// Display monthly payment and total payment
jtfMonthlyPayme nt.setText(Stri ng.format("%.2f ",
loan.getMonthly Payment()));
jtfTotalPayment .setText(String .format("%.2f",
loan.getTotalPa yment()));
}
}

public static void main(String[] args) {
// Create a frame
JFrame frame = new JFrame("Applet is in the frame");

// Create an instance of the applet
LoanApplet applet = new LoanApplet();

// Add the applet to the frame
frame.add(apple t, BorderLayout.CE NTER);

// Invoke applet's init method
applet.init();

// Display the frame
frame.setLocati onRelativeTo(nu ll); // Center the frame
frame.setDefaul tCloseOperation (JFrame.EXIT_ON _CLOSE);
frame.setSize(3 00, 300);
frame.setVisibl e(true);
}
}



Here's my command results I don't see what I'm doing wrong please help:

K:\Lab3.java:28 : cannot find symbol
symbol : class LoanApplet
location: class Lab3
LoanApplet applet = new LoanApplet();
^
K:\Lab3.java:28 : cannot find symbol
symbol : class LoanApplet
location: class Lab3
LoanApplet applet = new LoanApplet();
^
2 errors

Tool completed with exit code 1

Please use code tags when posting code.
Did you compile the LoanApplet class successfully first?

[tudyfruity18]

Please use code tags when posting code.
Did you compile the LoanApplet class successfully first?

Yes the LoanApplet compiled and ran successfully

[tudyfruity18]

Please use code tags when posting code.
Did you compile the LoanApplet class successfully first?

Yes it complied and ran successfully

[r035198x]

Yes it complied and ran successfully

Are these classes in the same folder?