Java Programming: Design a Graphical User Interface (GUI) for a calculator that

Question

Java Programming:

Design a Graphical User Interface (GUI) for a calculator that will have the same look as shown in the Figure below. Here the components that you will need to create this GUI: JButton (You will need fifteen) JTextField (You will need one)

Explanation / Answer

import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class Frame extends JFrame { private double tempNumbers1 = 0; private double tempNumbers2 = 0; private byte function = -1; private JTextField resultJText; public Frame() { 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 { @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 = 1; } } private class AddButton 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 = 2; } } private class SubtractButton 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 = 3; } } }

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