I already created a class Calculator that performs basic arithmetic,
now I need to create a class called ScientificCalculator that the functionalities of "Calculator" class through use of inheritance. Scientific Calculator has additional operstions of 1) taking a log of a number to any base 2) taking any number to any power. The operational keys for log, and power are "LogX_BaseY", and "X^Y" respectively.
This is my code for the Calculator:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
public class CalculatorApplication extends JFrame implements ActionListener {
JTextField resultField;
int operandOne;
int operandTwo;
int operator;
private final int WINDOW_WIDTH = 280;
private final int WINDOW_HEIGHT = 240;
JButton addButton;
JButton subtractButton;
JButton multiplyButton;
JButton divideButton;
JButton equalsButton;
JButton dotButton;
JButton cancelButton;
JButton backButton;
JButton one1;
JButton two2;
JButton three3;
JButton four4;
JButton five5;
JButton six6;
JButton seven7;
JButton eight8;
JButton nine9;
JButton zero0;
Object source;
public CalculatorApplication() {
super("Calculator");
setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
JPanel operandPanel;
JPanel buttonPanel1;
JPanel buttonPanel2;
JPanel buttonPanel3;
JPanel buttonPanel4;
Container cp;
cp = getContentPane();
cp.setLayout(new GridLayout(6, 2));
operandPanel = new JPanel();
operandPanel.setLayout(new FlowLayout());
resultField = new JTextField("0", 23);
resultField.setHorizontalAlignment(SwingConstants.RIGHT);
operandPanel.add(resultField);
cp.add(operandPanel);
buttonPanel1 = new JPanel();
buttonPanel1.setLayout(new FlowLayout());
seven7 = new JButton(" 7 ");
seven7.addActionListener(this);
buttonPanel1.add(seven7);
eight8 = new JButton(" 8 ");
eight8.addActionListener(this);
buttonPanel1.add(eight8);
nine9 = new JButton(" 9 ");
nine9.addActionListener(this);
buttonPanel1.add(nine9);
cancelButton = new JButton(" C ");
cancelButton.addActionListener(this);
buttonPanel1.add(cancelButton);
cp.add(buttonPanel1);
buttonPanel2 = new JPanel();
buttonPanel2.setLayout(new FlowLayout());
four4 = new JButton(" 4 ");
four4.addActionListener(this);
buttonPanel2.add(four4);
five5 = new JButton(" 5 ");
five5.addActionListener(this);
buttonPanel2.add(five5);
six6 = new JButton(" 6 ");
six6.addActionListener(this);
buttonPanel2.add(six6);
divideButton = new JButton(" / ");
divideButton.addActionListener(this);
buttonPanel1.add(divideButton);
cp.add(buttonPanel2);
buttonPanel3 = new JPanel();
buttonPanel3.setLayout(new FlowLayout());
one1 = new JButton(" 1 ");
one1.addActionListener(this);
buttonPanel3.add(one1);
two2 = new JButton(" 2 ");
two2.addActionListener(this);
buttonPanel3.add(two2);
three3 = new JButton(" 3 ");
three3.addActionListener(this);
buttonPanel3.add(three3);
multiplyButton = new JButton(" * ");
multiplyButton.addActionListener(this);
buttonPanel2.add(multiplyButton);
cp.add(buttonPanel3);
buttonPanel4 = new JPanel();
buttonPanel4.setLayout(new FlowLayout());
zero0 = new JButton(" 0 ");
zero0.addActionListener(this);
buttonPanel4.add(zero0);
addButton = new JButton(" + ");
addButton.addActionListener(this);
buttonPanel4.add(addButton);
subtractButton = new JButton(" - ");
subtractButton.addActionListener(this);
buttonPanel3.add(subtractButton);
equalsButton = new JButton(" = ");
equalsButton.addActionListener(this);
buttonPanel4.add(equalsButton);
cp.add(buttonPanel4);
setVisible(true);
}
public void showResult() {
boolean validOperands;
validOperands = true;
if (validOperands) {
if (source == one1) {
if (resultField.getText().equals("0"))
resultField.setText("1");
else
resultField.setText(resultField.getText() + "1");
}
else if (source == two2) {
if (resultField.getText().equals("0"))
resultField.setText("2");
else
resultField.setText(resultField.getText() + "2");
}
else if (source == three3) {
if (resultField.getText().equals("0"))
resultField.setText("3");
else
resultField.setText(resultField.getText() + "3");
}
else if (source == four4) {
if (resultField.getText().equals("0"))
resultField.setText("4");
else
resultField.setText(resultField.getText() + "4");
}
else if (source == five5) {
if (resultField.getText().equals("0"))
resultField.setText("5");
else
resultField.setText(resultField.getText() + "5");
}
else if (source == six6) {
if (resultField.getText().equals("0"))
resultField.setText("6");
else
resultField.setText(resultField.getText() + "6");
}
else if (source == seven7) {
if (resultField.getText().equals("0"))
resultField.setText("7");
else
resultField.setText(resultField.getText() + "7");
}
else if (source == eight8) {
if (resultField.getText().equals("0"))
resultField.setText("8");
else
resultField.setText(resultField.getText() + "8");
}
else if (source == nine9) {
if (resultField.getText().equals("0"))
resultField.setText("9");
else
resultField.setText(resultField.getText() + "9");
}
else if (source == zero0) {
if (resultField.getText().equals("0"))
resultField.setText("0");
else
resultField.setText(resultField.getText() + "0");
}
else if (source == cancelButton) {
resultField.setText("0");
}
else if (source == backButton) {
if (!(resultField.getText().equals("0") || resultField.getText().equals("0.0")) && resultField.getText().length() > 1){
resultField.setText(resultField.getText().substring(0,resultField.getText().length()-1));
}
}
else if (source == addButton) {
operandOne = Integer.parseInt(resultField.getText());
resultField.setText("0");
operator = 1;
}
else if (source == subtractButton) {
operandOne = Integer.parseInt(resultField.getText());
resultField.setText("0");
operator = 2;
}
else if (source == multiplyButton) {
operandOne = Integer.parseInt(resultField.getText());
resultField.setText("0");
operator = 3;
}
else if (source == divideButton) {
operandOne = Integer.parseInt(resultField.getText());
resultField.setText("0");
operator = 4;
}
else if (source == equalsButton) {
operandTwo = Integer.parseInt(resultField.getText());
switch(operator){
case 1:
resultField.setText(Integer.toString(operandOne + operandTwo));
operandOne = 0;
operandTwo = 0;
break;
case 2:
resultField.setText(Integer.toString(operandOne - operandTwo));
operandOne = 0;
operandTwo = 0;
break;
case 3:
resultField.setText(Integer.toString(operandOne * operandTwo));
operandOne = 0;
operandTwo = 0;
break;
case 4:
if (operandTwo != 0){
resultField.setText(Integer.toString(operandOne / operandTwo));
operandOne = 0;
operandTwo = 0;
}
else{
resultField.setText("Error");
}
break;
}
}
}
}
public void actionPerformed(ActionEvent ae) {
source = ae.getSource();
showResult();
}
public static void main(String[] args) {
CalculatorApplication app = new CalculatorApplication();
app.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
System.exit(0);
}
});
}
}This is what I have for the Scientific calculator, but I can't even get it to display the new buttons..I'm extending it wrong? Or is there something wrong with my constructor? I'm stuck on just getting the buttons to be displayed, if I can do that, I think I might know how to do the rest.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
public class ScientificCalculator extends CalculatorApplication {
JButton logButton;
JButton powerButton;
public ScientificCalculator(){
super();
JPanel buttonPanel5;
Container cp;
cp = getContentPane();
buttonPanel5 = new JPanel();
buttonPanel5.setLayout(new FlowLayout());
logButton = new JButton("LogX_Base_Y");
logButton.addActionListener(this);
buttonPanel5.add(logButton);
powerButton = new JButton("X^Y");
powerButton.addActionListener(this);
buttonPanel5.add(powerButton);
cp.add(buttonPanel5);
setVisible(true);
}
}And just to be sure, for the log operation I would use Math.log(operand1)/java.Lang.Math.log(operand2)
For power: Math.pow(operand1, operand2);
Does that seem correct?