Solved

# How do I create a horizontal button group

Posted on 2006-06-16
252 Views
I have my mortgage calculator code below. I am already using a vertical radiogroup to allow the user to select a pre-defined loan. I want to use another radiogroup I have to allow the user to select the method of calculation they want to use. I have added it already as the choiceGroup. I would like t o display them horizontally rather than vertically. As a second question, I was also wondering if there is a way to customize the space between them.
How can I do this?
Any assistance would be appreciated.
Thanks,
Jon

//week3 Jan Schab

/* Mortgage Monyhly Payment Calculator with graphical user interface
Programmer:  J.Schab
Date:        June 10,2006
Filename:    Mortgage.java
Purpose:     This project accepts the mortgage amountand allows  the user to select one of 3
pre-determined loans.The program then calculates the monthly mortgage payment and displays
it in currency format. The program then displays the payment number, the monthly principle
paid, the monthly interest paid, and the current loan balance.There is a quit button to
exit the application, and a clear button to clear user entered fields as well as the amortization table.
in order to calculate a new mortgage. The program will also clear the payment field should
the user press any key while positioned in the input textfield for amount.

*/

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.JScrollPane.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import java.text.NumberFormat;
import java.util.Locale;
import java.text.*;
import java.text.DecimalFormat;

class Mortgage extends JFrame
{

//Program variables

double yearlyRate[] =
{
// array of interest rates
5.35, 5.50, 5.75
};
int term[] =
{
//array of terms
7, 15, 30
};
int termMonths[] =
{
//array of terms in months
84, 180, 360
};

int payment = 0; // payment counter
int i = 0; // used as index
// initialize variable for monthly interest rate
double monthlyInterest = 0.00;
double principle = 0.00;
// initialize mothly principle paid field
double monthlyPrinciplePaid = 0.00;
double interestRateMonthly = 0.00;
double monthlyPayment;
int amount = 0;

Border rowborder = new EmptyBorder(3, 10, 3, 10);
// Format output
DecimalFormat currency = new DecimalFormat("\$0.00");

// JLabel and JTextField for the mortgage amount
private JLabel amountJLabel;
private JTextField amountJTextField;

// JLabel for monthly mortgage payment
private JLabel monthpayJLabel;

// JTextArea for displaying payment
private JTextArea outputJTextArea;

// JButton to initiate calculations
private JButton calculateJButton;

// JButton to display amortization table
private JButton displayJButton;

// JButton to clear entries
private JButton clearJButton;

// JButton to quit
private JButton quitJButton;

// JLabel and JTextField for interest percentage rate
private JLabel interestJLabel;
private JTextField interestJTextField;

// JLabel and JTextField for mortgage term
private JLabel termJLabel;
private JTextField termJTextField;

// Create radio panel for pre-determined loans

JTextArea displayArea = new JTextArea(10, 75);
JScrollPane scroll = new JScrollPane(displayArea);

// Create radio panel for method choice
JPanel choicePanel = new JPanel();

// no-argument constructor
public Mortgage()

{
createUserInterface();
}

// create and position the GUI components; register event handlers
private void createUserInterface()
{
// get content pane for attaching GUI components
Container contentPane = getContentPane();

setTitle("Mortgage Calculator"); // set title bar text

// enable specific positioning of GUI components
contentPane.setLayout(null);

// set up amountJLabel
amountJLabel = new JLabel();
amountJLabel.setBounds(76, 5, 104, 26); // set size and position
amountJLabel.setText("Mortgage amount:");

// set up amountJTextField
amountJTextField = new JTextField();
amountJTextField.setBounds(200, 5, 56, 26); // set size and position
amountJTextField.setHorizontalAlignment(JTextField.RIGHT);

new KeyAdapter() // anonymous inner class
{
// event handler for key pressed in amountJTextField
public void keyPressed(KeyEvent event)
{
amountJTextFieldkeyPressed(event);
}

} // end anonymous inner class

); // end call to addKeyListener

// set up interestJLabel
interestJLabel = new JLabel("Annual interest rate:");
interestJLabel.setBounds(226, 170, 115, 26);
interestJLabel.setText("Annual interest rate:");

// set up interestJTextField
interestJTextField = new JTextField();
interestJTextField.setBounds(370, 170, 56, 26);
interestJTextField.setHorizontalAlignment(JTextField.RIGHT);

new KeyAdapter() // anonymous inner class
{
// evend handler for key pressed in interestJTextField
public void keyPressed(KeyEvent event)
{
interestJTextFieldkeyPressed(event);
}

} // end anonymous inner class

); // end call to addKeyListener

// set up termJLabel for term of loan
termJLabel = new JLabel();
termJLabel.setBounds(226, 130, 140, 26);
termJLabel.setText("Mortgage length (Years):");

// set up termJTextField to receive term of loan
termJTextField = new JTextField();
termJTextField.setBounds(370, 130, 56, 26);
termJTextField.setHorizontalAlignment(JTextField.RIGHT);

new KeyAdapter() // anonymous inner class
{
// event handler for key pressed in termJTextField
public void keyPressed(KeyEvent event)
{
termJTextFieldkeyPressed(event);
}

} // end anonymous inner class

); // end call to addKeyListener

ButtonGroup bgroup = new ButtonGroup();
radioPanel.setBounds(30, 120, 195, 95); // set size and position

ButtonGroup choicegroup = new ButtonGroup();
choicePanel.setLayout(new FlowLayout(FlowLayout.LEFT, 4, 4));
choicePanel.setBorder(rowborder);
choicePanel.setBounds(130, 50, 195, 95); // set size and position

// set up calculateJButton
calculateJButton = new JButton();
calculateJButton.setBounds(26, 220, 90, 26); // set size and position
calculateJButton.setText("Calculate");

new ActionListener() // anonymous inner class
{
// event handler called when calculateJButton is pressed
public void actionPerformed(ActionEvent event)
{

calculateJButtonActionPerformed(event);
}

} // end anonymous inner class

); // end call to addActionListener

// set up displayJButton
displayJButton = new JButton();
displayJButton.setBounds(26, 280, 200, 26); // set size and position
displayJButton.setText("Display Amortization Table");

new ActionListener() // anonymous inner class
{
// event handler called when clearJButton is pressed
public void actionPerformed(ActionEvent event)
{
displayJButtonActionPerformed(event);
}

} // end anonymous inner class

); // end call to addActionListener

// set up clearJButton
clearJButton = new JButton();
clearJButton.setBounds(120, 430, 90, 26); // set size and position
clearJButton.setText("Clear");

new ActionListener() // anonymous inner class
{
// event handler called when clearJButton is pressed
public void actionPerformed(ActionEvent event)
{
clearJButtonActionPerformed(event);
}

} // end anonymous inner class

); // end call to addActionListener

// set up quitJButton
quitJButton = new JButton();
quitJButton.setBounds(270, 430, 90, 26); // set size and position
quitJButton.setText("Quit");

new ActionListener() // anonymous inner class
{
// event handler called when quitJButton is pressed
public void actionPerformed(ActionEvent event)
{
quitJButtonActionPerformed(event);
}

} // end anonymous inner class

); // end call to addActionListener

// set up outputJTextArea
outputJTextArea = new JTextArea();
outputJTextArea.setBounds(300, 220, 56, 26); // set size and position
outputJTextArea.setEditable(false);

//set up monthpayJLabel
monthpayJLabel = new JLabel();
monthpayJLabel.setBounds(176, 220, 156, 26); // set size and position
monthpayJLabel.setText("Monthly Payment:");

scroll.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
scroll.setBounds(20, 300, 440, 130); // set size and position
setVisible(true);

} // end method createUserInterface

// called when user presses key in amountJTextField
private void amountJTextFieldkeyPressed(KeyEvent event)
{
outputJTextArea.setText(""); // clear outputJTextArea
displayArea.setText(""); // clear display
payment = 0; // reset payment counter
}

// method called when user clicks calculateJButton
private void calculateJButtonActionPerformed(ActionEvent event)
{
try
{
// check which radio buttonis selected and set index
if (aButton.isSelected())
{
i = 0;
}

if (bButton.isSelected())
{
i = 1;
}

if (cButton.isSelected())
{
i = 2;
}

//define display area titles
String titles = "Month \t Principal\t Interest\tBalance\n";
//put titles in display area
displayArea.setText(titles);
// initialize loan balance field
double loanbalance = 0.00;

// initialize payment counter

// clear outputJTextArea
outputJTextArea.setText("");
// clear display area
displayArea.setText("");
// Calculate months from years
int monthCount = (term[i] * 12);
// get mortgage amount
amount = Integer.parseInt(amountJTextField.getText());
//create variable to store decreasing principle
principle = amount;
// Calculate monthly interest
interestRateMonthly = (yearlyRate[i] / 12) / 100;

// Calculate monthly payment
monthlyPayment = (amount * interestRateMonthly) / (1-Math.pow(1 +
interestRateMonthly,  - monthCount));

// Output payment amount
outputJTextArea.setText(currency.format(monthlyPayment));

}

catch (NumberFormatException ex){}
}

// method called when user clicks clearJButton
private void clearJButtonActionPerformed(ActionEvent event)
{
try
{

monthlyPrinciplePaid = 0.00;
outputJTextArea.setText(""); // clear outputJTextArea
amountJTextField.setText(""); // clear amountJTextField
displayArea.setText(""); // clear display area
payment = 0; // reset payment counter

}
catch (NumberFormatException ex){}
}

// method called when user clicks displayJButton
private void displayJButtonActionPerformed(ActionEvent event)
{
try
{

// reset values in case user presses display more than once
principle = Integer.parseInt(amountJTextField.getText());
monthlyPrinciplePaid = 0.00;
displayArea.setText(""); // clear display
payment = 0;
monthlyPrinciplePaid = 0.00;

//define display area titles
String titles = "Month \t Principal\t Interest\tBalance\n";
//put titles in display area
displayArea.setText(titles);
// initialize loan balance field

// loop for creating amortization table
for (int a = 0; a < termMonths[i]; a = a + 1)
{
//increment payment counter
payment++;
// calculate monthly interest
monthlyInterest = principle * interestRateMonthly;
// calculate monthly principle
monthlyPrinciplePaid = monthlyPayment - monthlyInterest; //
//save declining balance
principle = principle - monthlyPrinciplePaid;

// display amortization table
displayArea.append(payment + "\t" + currency.format
(monthlyPrinciplePaid) + "\t" + currency.format
(monthlyInterest) + "\t" + currency.format(Math.abs
(principle)) + "\n");
displayArea.setCaretPosition(0);

}
}

catch (NumberFormatException ex){}
}

// method called when user clicks quitJButton
private void quitJButtonActionPerformed(ActionEvent event)
{
try
{
System.exit(0);

}
catch (NumberFormatException ex){}
}

// called when user presses key in termJTextField
private void termJTextFieldkeyPressed(KeyEvent event)
{
outputJTextArea.setText(""); // clear outputJTextArea
}

// called when user presses key in interestJTextField
private void interestJTextFieldkeyPressed(KeyEvent event)
{
outputJTextArea.setText(""); // clear outputJTextArea
}

// main method
public static void main(String[]args)
{
Mortgage application = new Mortgage();
application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
application.setSize(480, 500);
application.setVisible(true);
} // end method main

} // end class Mortgage
0
Question by:ghost8067
• 2

LVL 9

Expert Comment

ID: 16924436
It's predefButton and entryButton that u want to align horizontally ?
If yes replace setBounds with this one for example choicePanel.setBounds(29, 50, 340, 95);
0

LVL 9

Accepted Solution

matthew016 earned 500 total points
ID: 16924469
To have a space between them :

choicePanel.setLayout(new FlowLayout(FlowLayout.LEFT, 4, 4));

(U need a larger width bound according to the space between the components u add)
choicePanel.setBounds(29, 50, 500, 95);
0

Author Comment

ID: 16924737
Thanks a lot for the help. Everything now looks great.
Jon
0

## Featured Post

For customizing the look of your lightweight component and making it look opaque like it was made of plastic.  This tip assumes your component to be of rectangular shape and completely opaque.   (CODE)
For customizing the look of your lightweight component and making it look lucid like it was made of glass. Or: how to make your component more Apple-ish ;) This tip assumes your component to be of rectangular shape and completely opaque. (COD…
Viewers learn about the “while” loop and how to utilize it correctly in Java. Additionally, viewers begin exploring how to include conditional statements within a while loop and avoid an endless loop. Define While Loop: Basic Example: Explanatio…
Viewers will learn about basic arrays, how to declare them, and how to use them. Introduction and definition: Declare an array and cover the syntax of declaring them: Initialize every index in the created array: Example/Features of a basic arr…