This is a java program please type it, it will be more helpfull Create a simple

ID: 3808702 • Letter: T

Question

This is a java program please type it, it will be more helpfull

Create a simple calculator application that adds two numbers. The purpose of this assignment is to explore UI elements and event listeners.

Create a single class to hold your main instance, which will instantiate a JFrame and attach an instance of your CalculatorPanel class.

Create the CalculatorPanel class. This class should resize the main panel (itself) and create two sub-panels, each sized so they will fit side-by-side.

Into the left panel, add two text boxes (with labels) and a button.

Into the right panel add three labels, as shown below.

Add a listener to each of the textboxes so that when a person presses 'Enter', the label on the right panel updates.

Add a listener to the 'Calculate' button so that when a person presses it, the total updates.

For this assignment, you can safely assume that the calculate button is only pressed when there are values assigned.

When the button is clicked, it should look like this:

For 5% extra credit, attach the same event listener class to both textboxes (hint: pass a reference to the target label to the constructor).

Create a simple calculator application that adds two numbers. The purpose of this assignment is to explore UI elements and event listeners. Create a single class to hold your main instance, which will instantiate a UErame and attach an instance of your el class Create the culat class. This class should resize the main panel (itself and create two sub-panels, each sized so they will fit side-by-side. Into the left panel, add two text boxes (with labels) and a button. Into the right panel add three labels. as shown below. Dumb Calculator First Value: First Value: Second Value: Second Value: Total Calculate Add a listener to each of the textboxes so that when a person presses 'Enter', the label on the right panel updates. Add a listener to the 'Calculate' button so that when a person presses it, the total updates. For this assignment, you can safely assume that the calculate button is only pressed when there are values assigned When the button is clicked, it should look like this: Dumb Calculator First Value: 5 First Value: 5 Second Value: 3 Second Value 3 Total: 8 Calculate For 5% extra credit, attach the same event listener class to both textboxes (hint: pass a reference to the target label to the constructor.

Explanation / Answer

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class calculator extends JFrame {

private double tempNumbers1 = 0;
private double tempNumbers2 = 0;

private byte function = -1;

private JTextField resultJText;

public calculator() {

JButton[] numberButtons = new JButton[10];

for ( int i = 9; i >= 0; i--) {
numberButtons[i] = new JButton(Integer.toString(i));
}

JButton enterButton = new JButton("Enter");
JButton cButton = new JButton("C");
JButton multiplyButton = new JButton("*");
JButton divideButton = new JButton("/");
JButton addButton = new JButton("+");
JButton substractButton = new JButton("-");

resultJText = new JTextField();
resultJText.setPreferredSize(new Dimension(160, 20));
resultJText.setBackground(Color.WHITE);
resultJText.setEnabled(false);
resultJText.setHorizontalAlignment(4);
resultJText.setDisabledTextColor(Color.BLACK);

JPanel motherPanel = new JPanel();
motherPanel.setLayout(new BoxLayout(motherPanel, BoxLayout.Y_AXIS));

JPanel textPanel = new JPanel();
textPanel.setPreferredSize(new Dimension(160, 20));
textPanel.add(resultJText);

JPanel numberButtonsPanel = new JPanel();
numberButtonsPanel.setPreferredSize(new Dimension(160, 100));

for(int i = 9; i>=0; i--) {
numberButtonsPanel.add(numberButtons[i]);
}

JPanel functionButtonPanel = new JPanel();
functionButtonPanel.setPreferredSize(new Dimension(160, 35));
functionButtonPanel.add(enterButton);
functionButtonPanel.add(cButton);
functionButtonPanel.add(multiplyButton);
functionButtonPanel.add(divideButton);
functionButtonPanel.add(addButton);
functionButtonPanel.add(substractButton);

numberButtonsAction[] numberButtonActions = new numberButtonsAction[10];
for ( int i = 0; i < 10; i++ ) {
numberButtonActions[i] = new numberButtonsAction(numberButtons[i]);
numberButtons[i].addActionListener(numberButtonActions[i]);
}

EnterButton enter = new EnterButton();
enterButton.addActionListener(enter);

CButton c = new CButton();
cButton.addActionListener(c);

MultiplyButton multiply = new MultiplyButton();
multiplyButton.addActionListener(multiply);

DivideButton divide = new DivideButton();
divideButton.addActionListener(divide);

AddButton add = new AddButton();
addButton.addActionListener(add);

SubtractButton subtract = new SubtractButton();
substractButton.addActionListener(subtract);

motherPanel.add(textPanel);
motherPanel.add(numberButtonsPanel);
motherPanel.add(functionButtonPanel);
add(motherPanel);

setTitle("ButtonTest");
setSize(180, 290);
setLocationByPlatform(true);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setVisible(true);

}

private class numberButtonsAction implements ActionListener {

private String c;

public numberButtonsAction(JButton a) {
this.c = a.getText();
}

public void actionPerformed(ActionEvent e) {
if (!resultJText.getText().equals("0.0")) {
resultJText.setText(resultJText.getText() + c);
} else {
resultJText.setText("");
actionPerformed(e);
}
}
}

private class EnterButton implements ActionListener {

@Override
public void actionPerformed(ActionEvent e) {
tempNumbers2 = Double.parseDouble(resultJText.getText());

if (function == 0) {
resultJText.setText(Double.toString((Math.round((tempNumbers1 / tempNumbers2) * 100)) / 100));
} else if (function == 1) {
resultJText.setText(Double.toString(tempNumbers1 * tempNumbers2));
} else if (function == 2) {
resultJText.setText(Double.toString(tempNumbers2 + tempNumbers1));
} else if (function == 3) {
resultJText.setText(Double.toString(tempNumbers1 - tempNumbers2));
} else {
resultJText.setText(String.valueOf(tempNumbers1));
}
tempNumbers1 = Double.parseDouble(resultJText.getText());
}

}

private class CButton implements ActionListener {

@Override
public void actionPerformed(ActionEvent e) {
resultJText.setText("");
tempNumbers1 = 0;
tempNumbers2 = 0;

function = -1;
}

}

private class DivideButton implements ActionListener {

@Override
public void actionPerformed(ActionEvent e) {
if (tempNumbers1 == 0) {
tempNumbers1 = Double.parseDouble(resultJText.getText());
resultJText.setText("");
} else {
tempNumbers2 = Double.parseDouble(resultJText.getText());
resultJText.setText("");
}
function = 0;
}

}

private class MultiplyButton implements ActionListener {

}

private class AddButton implements ActionListener {

}

private class SubtractButton implements ActionListener {

}
public static void main(String[] args)
{
calculator chegg=new calculator();

}
}

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