import javax.swing.*;

import java.awt.event.*;

// New event listener that monitors changing values for components

import javax.swing.event.ChangeEvent;

import javax.swing.event.ChangeListener;

// Allows me to format the numbers

import java.text.NumberFormat;

// Allows me to edit borders on panels

import javax.swing.border.*;

public class JavaLesson23 extends JFrame{

JButton button1;

JLabel label1, label2, label3;

JTextField textField1, textField2;

JCheckBox dollarSign, commaSeparator;

JRadioButton addNums, subtractNums, multNums, divideNums;

JSlider howManyTimes;

double number1, number2, totalCalc;

public static void main(String[] args){

new JavaLesson23();

}

public JavaLesson23(){

// Define the size of the frame

this.setSize(400, 400);

// Opens the frame in the middle of the screen

this.setLocationRelativeTo(null);

// Define how the frame exits (Click the Close Button)

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

// Define the title for the frame

this.setTitle("My Third Frame");

// The JPanel contains all of the components for your frame

JPanel thePanel = new JPanel();

// ---------------------------------------------------------

// Create a button with Click Here on it

button1 = new JButton("Calculate");

// Create an instance of ListenForEvents to handle events

ListenForButton lForButton = new ListenForButton();

// Tell Java that you want to be alerted when an event

// occurs on the button

button1.addActionListener(lForButton);

thePanel.add(button1);

// How to add a label --------------------------

label1 = new JLabel("Number 1");

thePanel.add(label1);

// How to add a text field ----------------------

textField1 = new JTextField("", 5);

thePanel.add(textField1);

// How to add a label --------------------------

label2 = new JLabel("Number 2");

thePanel.add(label2);

// How to add a text field ----------------------

textField2 = new JTextField("", 5);

thePanel.add(textField2);

// How to add checkboxes ------------------------

dollarSign = new JCheckBox("Dollars");

commaSeparator = new JCheckBox("Commas");

thePanel.add(dollarSign);

// By putting true in here it is selected by default

thePanel.add(commaSeparator, true);

// Creates radio buttons with default labels

addNums = new JRadioButton("Add");

subtractNums = new JRadioButton("Subtract");

multNums = new JRadioButton("Multiply");

divideNums = new JRadioButton("Divide");

// Creates a group that will contain radio buttons

// You do this so that when 1 is selected the others

// are deselected

ButtonGroup operation = new ButtonGroup();

// Add radio buttons to the group

operation.add(addNums);

operation.add(subtractNums);

operation.add(multNums);

operation.add(divideNums);

// Create a new panel to hold radio buttons

JPanel operPanel = new JPanel();

// Surround radio button panel with a border

// You can define different types of borders

// createEtchedBorder, createLineBorder, createTitledBorder

// createLoweredBevelBorder, createRaisedBevelBorder

Border operBorder = BorderFactory.createTitledBorder("Operation");

// Set the border for the panel

operPanel.setBorder(operBorder);

// Add the radio buttons to the panel

operPanel.add(addNums);

operPanel.add(subtractNums);

operPanel.add(multNums);

operPanel.add(divideNums);

// Selects the add radio button by default

addNums.setSelected(true);

// Add the panel to the main panel

// You don't add the group

thePanel.add(operPanel);

// How to create a slider ----------------

label3 = new JLabel("Perform How Many Times?");

thePanel.add(label3);

// Creates a slider with a min value of 0 thru 99

// and an initial value of 1

howManyTimes = new JSlider(0, 99, 1);

// Defines the minimum space between ticks

howManyTimes.setMinorTickSpacing(1);

// Defines the minimum space between major ticks

howManyTimes.setMajorTickSpacing(10);

// Says to draw the ticks on the slider

howManyTimes.setPaintTicks(true);

// Says to draw the tick labels on the slider

howManyTimes.setPaintLabels(true);

// Create an instance of ListenForEvents to handle events

ListenForSlider lForSlider = new ListenForSlider();

// Tell Java that you want to be alerted when an event

// occurs on the slider

howManyTimes.addChangeListener(lForSlider);

thePanel.add(howManyTimes);

this.add(thePanel);

this.setVisible(true);

// Gives focus to the textfield

textField1.requestFocus();

}

private class ListenForButton implements ActionListener{

// This method is called when an event occurs

public void actionPerformed(ActionEvent e){

// Check if the source of the event was the button

if(e.getSource() == button1){

// getText returns a String so you have to parse it

// into a double in this situation

try{

number1 = Double.parseDouble(textField1.getText());

number2 = Double.parseDouble(textField2.getText());

}

catch(NumberFormatException excep){

// JOptionPane displays a popup on the screen

// (parentComponent, message, title, error icon)

// Error Icons: WARNING_MESSAGE, QUESTION_MESSAGE, PLAIN_MESSAGE

JOptionPane.showMessageDialog(JavaLesson23.this, "Please Enter the Right Info", "Error", JOptionPane.ERROR_MESSAGE);

System.exit(0); // Closes the Java app

}

if(addNums.isSelected()) { totalCalc = addNumbers(number1, number2, howManyTimes.getValue());

} else if(subtractNums.isSelected()) { totalCalc = subtractNumbers(number1, number2, howManyTimes.getValue());

} else if(multNums.isSelected()) { totalCalc = multiplyNumbers(number1, number2, howManyTimes.getValue());

} else { totalCalc = divideNumbers(number1, number2, howManyTimes.getValue()); }

// If the dollar is selected in the checkbox print the number as currency

if(dollarSign.isSelected()) {

// Defines that you want to format a number with $ and commas

NumberFormat numFormat = NumberFormat.getCurrencyInstance();

JOptionPane.showMessageDialog(JavaLesson23.this, numFormat.format(totalCalc), "Solution", JOptionPane.INFORMATION_MESSAGE);

}

// If the comma is selected in the checkbox print the number with commas

else if(commaSeparator.isSelected()) {

// Defines that you want to format a number with commas

NumberFormat numFormat = NumberFormat.getNumberInstance();

JOptionPane.showMessageDialog(JavaLesson23.this, numFormat.format(totalCalc), "Solution", JOptionPane.INFORMATION_MESSAGE);

} else {

JOptionPane.showMessageDialog(JavaLesson23.this, totalCalc, "Solution", JOptionPane.INFORMATION_MESSAGE);

}

}

}

}

// Implements ActionListener so it can react to events on components

private class ListenForSlider implements ChangeListener{

@Override

public void stateChanged(ChangeEvent e) {

// Check if the source of the event was the button

if(e.getSource() == howManyTimes){

label3.setText("Perform How Many Times? " + howManyTimes.getValue() );

}

}

}

public static double addNumbers(double number1, double number2, int howMany){

double total = 0;

int i = 1;

while(i <= howMany){

total = total + (number1 + number2);

i++;

}

return total;

}

public static double subtractNumbers(double number1, double number2, int howMany){

double total = 0;

int i = 1;

while(i <= howMany){

total = total + (number1 - number2);

i++;

}

return total;

}

public static double multiplyNumbers(double number1, double number2, int howMany){

double total = 0;

int i = 1;

while(i <= howMany){

total = total + (number1 * number2);

i++;

}

return total;

}

public static double divideNumbers(double number1, double number2, int howMany){

double total = 0;

int i = 1;

while(i <= howMany){

total = total + (number1 / number2);

i++;

}

return total;

}

}