Okay, so here is my latest challenge. I am writing this for school. So far, I have been able to get the GUI to function ‘basically’ the way I want it to, but I have run into some trouble integrating a Formatted Text Field. What I cannot understand is why the program won’t accept 5.75 for an interest rate – it defaults to 5 – when the calculation module worked fine in a different program before I plugged its logic into my GUI program. That being said, I am posting my code, and any input would be helpful. Thanks in advance!
CODE:
import java.text.DecimalFormat;
import java.text.NumberFormat;
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/*
* MortgageCalculatorGUI.java
*
* Created on Dec 18, 2011, 9:01:24 PM
*/
/**
*
* @author Roy Kosch
*/
public class MortgageCalculatorGUI extends javax.swing.JFrame {
/** Creates new form MortgageCalculatorGUI */
public MortgageCalculatorGUI() {
initComponents();
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
tempTextField1 = new javax.swing.JTextField();
tempTextField2 = new javax.swing.JTextField();
tempTextField3 = new javax.swing.JTextField();
interestLabel = new javax.swing.JLabel();
termLabel = new javax.swing.JLabel();
loanLabel = new javax.swing.JLabel();
calculateButton = new javax.swing.JButton();
backButton = new javax.swing.JButton();
quitButton = new javax.swing.JButton();
paymentLabel = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Kosch Mortgage Calculator");
tempTextField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
tempTextField1ActionPerformed(evt);
}
});
tempTextField2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
tempTextField2ActionPerformed(evt);
}
});
interestLabel.setText("Interest");
termLabel.setText("Loan Term");
loanLabel.setText("Loan Amount");
calculateButton.setText("Calculate");
calculateButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
calculateButtonActionPerformed(evt);
}
});
backButton.setText("Go Back");
backButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
backButtonActionPerformed(evt);
}
});
quitButton.setText("QUIT");
quitButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
quitButtonActionPerformed(evt);
}
});
paymentLabel.setText("Your payment is:");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(77, 77, 77)
.addComponent(tempTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(interestLabel))
.addGroup(layout.createSequentialGroup()
.addGap(115, 115, 115)
.addComponent(quitButton))
.addGroup(layout.createSequentialGroup()
.addGap(77, 77, 77)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(tempTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(tempTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(termLabel)
.addComponent(loanLabel)))
.addGroup(layout.createSequentialGroup()
.addGap(66, 66, 66)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(paymentLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 214, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addComponent(calculateButton)
.addGap(18, 18, 18)
.addComponent(backButton)))))
.addContainerGap(26, Short.MAX_VALUE))
);
layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {backButton, calculateButton, interestLabel, loanLabel, quitButton, tempTextField1, tempTextField2, tempTextField3, termLabel});
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(52, 52, 52)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(tempTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(interestLabel))
.addGap(32, 32, 32)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(tempTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(termLabel))
.addGap(26, 26, 26)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(tempTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(loanLabel))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(paymentLabel, javax.swing.GroupLayout.DEFAULT_SIZE, 31, Short.MAX_VALUE)
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(calculateButton)
.addComponent(backButton))
.addGap(18, 18, 18)
.addComponent(quitButton)
.addGap(39, 39, 39))
);
layout.linkSize(javax.swing.SwingConstants.VERTICAL, new java.awt.Component[] {backButton, calculateButton, interestLabel, loanLabel, quitButton, tempTextField1, tempTextField2, tempTextField3, termLabel});
pack();
}// </editor-fold>
private void tempTextField1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void tempTextField2ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void calculateButtonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
{
NumberFormat formatter = new DecimalFormat("#0.00");
double principalLoan = (int)((Double.parseDouble(tempTextField3.getText())));
double loanInterest = (int)((Double.parseDouble(tempTextField1.getText())));
double loanTerm = (int)((Double.parseDouble(tempTextField2.getText())));
double compoundMultiplier = loanInterest/1200;
double termMultiplier = loanTerm*(12);
double exponent = -1*(termMultiplier);
double a = 1+compoundMultiplier;
double b = Math.pow(a,exponent);
double c = 1 - b;
double d = compoundMultiplier/c;
double mortgagePayment = d*principalLoan;
paymentLabel.setText("Your Payment is: $" + formatter.format(mortgagePayment));
}
}
private void backButtonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void quitButtonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(MortgageCalculatorGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(MortgageCalculatorGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(MortgageCalculatorGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(MortgageCalculatorGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new MortgageCalculatorGUI().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton backButton;
private javax.swing.JButton calculateButton;
private javax.swing.JLabel interestLabel;
private javax.swing.JLabel loanLabel;
private javax.swing.JLabel paymentLabel;
private javax.swing.JButton quitButton;
private javax.swing.JTextField tempTextField1;
private javax.swing.JTextField tempTextField2;
private javax.swing.JTextField tempTextField3;
private javax.swing.JLabel termLabel;
// End of variables declaration
}
Problem : Unnecessary casting to
int.Solution : Don’t unnecessarily cast these to
int.