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Calculator.java
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Calculator.java
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import java.awt.Cursor;
import java.awt.Font;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.util.function.Consumer;
import java.util.regex.Pattern;
import java.awt.Color;
import javax.swing.*;
import java.lang.Math;
public class Calculator {
private static final int WINDOW_WIDTH = 410;
private static final int WINDOW_HEIGHT = 600;
private static final int BUTTON_WIDTH = 80;
private static final int BUTTON_HEIGHT = 70;
private static final int MARGIN_X = 20;
private static final int MARGIN_Y = 60;
private JFrame window; // Main window
private JComboBox<String> comboCalcType, comboTheme;
private JTextField inText; // Input
private JButton btnC, btnBack, btnMod, btnDiv, btnMul, btnSub, btnAdd,
btn0, btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8, btn9,
btnPoint, btnEqual, btnRoot, btnPower, btnLog;
private char opt = ' '; // Save the operator
private boolean go = true; // For calculate with Opt != (=)
private boolean addWrite = true; // Connect numbers in display
private double val = 0; // Save the value typed for calculation
public Calculator() {
window = new JFrame("Calculator");
window.setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
window.setLocationRelativeTo(null); // Move window to center
comboTheme = initCombo(new String[]{"Simple", "Colored", "DarkTheme"}, 230, 30, "Theme", themeSwitchEventConsumer);
comboCalcType = initCombo(new String[]{"Standard", "Scientific"}, 20, 30, "Calculator type", calcTypeSwitchEventConsumer);
int[] x = {MARGIN_X, MARGIN_X + 90, 200, 290, 380};
int[] y = {MARGIN_Y, MARGIN_Y + 100, MARGIN_Y + 180, MARGIN_Y + 260, MARGIN_Y + 340, MARGIN_Y + 420};
inText = new JTextField("0");
inText.setBounds(x[0], y[0], 350, 70);
inText.setEditable(false);
inText.setBackground(Color.WHITE);
inText.setFont(new Font("Comic Sans MS", Font.PLAIN, 33));
window.add(inText);
btnC = initBtn("C", x[0], y[1], event -> {
repaintFont();
inText.setText("0");
opt = ' ';
val = 0;
});
btnBack = initBtn("<-", x[1], y[1], event -> {
repaintFont();
String str = inText.getText();
StringBuilder str2 = new StringBuilder();
for (int i = 0; i < (str.length() - 1); i++) {
str2.append(str.charAt(i));
}
if (str2.toString().equals("")) {
inText.setText("0");
} else {
inText.setText(str2.toString());
}
});
btnMod = initBtn("%", x[2], y[1], event -> {
repaintFont();
if (Pattern.matches("([-]?\\d+[.]\\d*)|(\\d+)", inText.getText()))
if (go) {
val = calc(val, inText.getText(), opt);
if (Pattern.matches("[-]?[\\d]+[.][0]*", String.valueOf(val))) {
inText.setText(String.valueOf((int) val));
} else {
inText.setText(String.valueOf(val));
}
opt = '%';
go = false;
addWrite = false;
}
});
btnDiv = initBtn("/", x[3], y[1], event -> {
repaintFont();
if (Pattern.matches("([-]?\\d+[.]\\d*)|(\\d+)", inText.getText()))
if (go) {
val = calc(val, inText.getText(), opt);
if (Pattern.matches("[-]?[\\d]+[.][0]*", String.valueOf(val))) {
inText.setText(String.valueOf((int) val));
} else {
inText.setText(String.valueOf(val));
}
opt = '/';
go = false;
addWrite = false;
} else {
opt = '/';
}
});
btn7 = initBtn("7", x[0], y[2], event -> {
repaintFont();
if (addWrite) {
if (Pattern.matches("[0]*", inText.getText())) {
inText.setText("7");
} else {
inText.setText(inText.getText() + "7");
}
} else {
inText.setText("7");
addWrite = true;
}
go = true;
});
btn8 = initBtn("8", x[1], y[2], event -> {
repaintFont();
if (addWrite) {
if (Pattern.matches("[0]*", inText.getText())) {
inText.setText("8");
} else {
inText.setText(inText.getText() + "8");
}
} else {
inText.setText("8");
addWrite = true;
}
go = true;
});
btn9 = initBtn("9", x[2], y[2], event -> {
repaintFont();
if (addWrite) {
if (Pattern.matches("[0]*", inText.getText())) {
inText.setText("9");
} else {
inText.setText(inText.getText() + "9");
}
} else {
inText.setText("9");
addWrite = true;
}
go = true;
});
btnMul = initBtn("*", x[3], y[2], event -> {
repaintFont();
if (Pattern.matches("([-]?\\d+[.]\\d*)|(\\d+)", inText.getText()))
if (go) {
val = calc(val, inText.getText(), opt);
if (Pattern.matches("[-]?[\\d]+[.][0]*", String.valueOf(val))) {
inText.setText(String.valueOf((int) val));
} else {
inText.setText(String.valueOf(val));
}
opt = '*';
go = false;
addWrite = false;
} else {
opt = '*';
}
});
btn4 = initBtn("4", x[0], y[3], event -> {
repaintFont();
if (addWrite) {
if (Pattern.matches("[0]*", inText.getText())) {
inText.setText("4");
} else {
inText.setText(inText.getText() + "4");
}
} else {
inText.setText("4");
addWrite = true;
}
go = true;
});
btn5 = initBtn("5", x[1], y[3], event -> {
repaintFont();
if (addWrite) {
if (Pattern.matches("[0]*", inText.getText())) {
inText.setText("5");
} else {
inText.setText(inText.getText() + "5");
}
} else {
inText.setText("5");
addWrite = true;
}
go = true;
});
btn6 = initBtn("6", x[2], y[3], event -> {
repaintFont();
if (addWrite) {
if (Pattern.matches("[0]*", inText.getText())) {
inText.setText("6");
} else {
inText.setText(inText.getText() + "6");
}
} else {
inText.setText("6");
addWrite = true;
}
go = true;
});
btnSub = initBtn("-", x[3], y[3], event -> {
repaintFont();
if (Pattern.matches("([-]?\\d+[.]\\d*)|(\\d+)", inText.getText()))
if (go) {
val = calc(val, inText.getText(), opt);
if (Pattern.matches("[-]?[\\d]+[.][0]*", String.valueOf(val))) {
inText.setText(String.valueOf((int) val));
} else {
inText.setText(String.valueOf(val));
}
opt = '-';
go = false;
addWrite = false;
} else {
opt = '-';
}
});
btn1 = initBtn("1", x[0], y[4], event -> {
repaintFont();
if (addWrite) {
if (Pattern.matches("[0]*", inText.getText())) {
inText.setText("1");
} else {
inText.setText(inText.getText() + "1");
}
} else {
inText.setText("1");
addWrite = true;
}
go = true;
});
btn2 = initBtn("2", x[1], y[4], event -> {
repaintFont();
if (addWrite) {
if (Pattern.matches("[0]*", inText.getText())) {
inText.setText("2");
} else {
inText.setText(inText.getText() + "2");
}
} else {
inText.setText("2");
addWrite = true;
}
go = true;
});
btn3 = initBtn("3", x[2], y[4], event -> {
repaintFont();
if (addWrite) {
if (Pattern.matches("[0]*", inText.getText())) {
inText.setText("3");
} else {
inText.setText(inText.getText() + "3");
}
} else {
inText.setText("3");
addWrite = true;
}
go = true;
});
btnAdd = initBtn("+", x[3], y[4], event -> {
repaintFont();
if (Pattern.matches("([-]?\\d+[.]\\d*)|(\\d+)", inText.getText()))
if (go) {
val = calc(val, inText.getText(), opt);
if (Pattern.matches("[-]?[\\d]+[.][0]*", String.valueOf(val))) {
inText.setText(String.valueOf((int) val));
} else {
inText.setText(String.valueOf(val));
}
opt = '+';
go = false;
addWrite = false;
} else {
opt = '+';
}
});
btnPoint = initBtn(".", x[0], y[5], event -> {
repaintFont();
if (addWrite) {
if (!inText.getText().contains(".")) {
inText.setText(inText.getText() + ".");
}
} else {
inText.setText("0.");
addWrite = true;
}
go = true;
});
btn0 = initBtn("0", x[1], y[5], event -> {
repaintFont();
if (addWrite) {
if (Pattern.matches("[0]*", inText.getText())) {
inText.setText("0");
} else {
inText.setText(inText.getText() + "0");
}
} else {
inText.setText("0");
addWrite = true;
}
go = true;
});
btnEqual = initBtn("=", x[2], y[5], event -> {
if (Pattern.matches("([-]?\\d+[.]\\d*)|(\\d+)", inText.getText()))
if (go) {
val = calc(val, inText.getText(), opt);
if (Pattern.matches("[-]?[\\d]+[.][0]*", String.valueOf(val))) {
inText.setText(String.valueOf((int) val));
} else {
inText.setText(String.valueOf(val));
}
opt = '=';
addWrite = false;
}
});
btnEqual.setSize(2 * BUTTON_WIDTH + 10, BUTTON_HEIGHT);
btnRoot = initBtn("√", x[4], y[1], event -> {
if (Pattern.matches("([-]?\\d+[.]\\d*)|(\\d+)", inText.getText()))
if (go) {
val = Math.sqrt(Double.parseDouble(inText.getText()));
if (Pattern.matches("[-]?[\\d]+[.][0]*", String.valueOf(val))) {
inText.setText(String.valueOf((int) val));
} else {
inText.setText(String.valueOf(val));
}
opt = '√';
addWrite = false;
}
});
btnRoot.setVisible(false);
btnPower = initBtn("pow", x[4], y[2], event -> {
repaintFont();
if (Pattern.matches("([-]?\\d+[.]\\d*)|(\\d+)", inText.getText()))
if (go) {
val = calc(val, inText.getText(), opt);
if (Pattern.matches("[-]?[\\d]+[.][0]*", String.valueOf(val))) {
inText.setText(String.valueOf((int) val));
} else {
inText.setText(String.valueOf(val));
}
opt = '^';
go = false;
addWrite = false;
} else {
opt = '^';
}
});
btnPower.setFont(new Font("Comic Sans MS", Font.PLAIN, 24));
btnPower.setVisible(false);
btnLog = initBtn("ln", x[4], y[3], event -> {
if (Pattern.matches("([-]?\\d+[.]\\d*)|(\\d+)", inText.getText()))
if (go) {
val = Math.log(Double.parseDouble(inText.getText()));
if (Pattern.matches("[-]?[\\d]+[.][0]*", String.valueOf(val))) {
inText.setText(String.valueOf((int) val));
} else {
inText.setText(String.valueOf(val));
}
opt = 'l';
addWrite = false;
}
});
btnLog.setVisible(false);
window.setLayout(null);
window.setResizable(false);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Close button clicked? = End The process
window.setVisible(true);
}
private JComboBox<String> initCombo(String[] items, int x, int y, String toolTip, Consumer consumerEvent) {
JComboBox<String> combo = new JComboBox<>(items);
combo.setBounds(x, y, 140, 25);
combo.setToolTipText(toolTip);
combo.setCursor(new Cursor(Cursor.HAND_CURSOR));
combo.addItemListener(consumerEvent::accept);
window.add(combo);
return combo;
}
private JButton initBtn(String label, int x, int y, ActionListener event) {
JButton btn = new JButton(label);
btn.setBounds(x, y, BUTTON_WIDTH, BUTTON_HEIGHT);
btn.setFont(new Font("Comic Sans MS", Font.PLAIN, 28));
btn.setCursor(new Cursor(Cursor.HAND_CURSOR));
btn.addActionListener(event);
btn.setFocusable(false);
window.add(btn);
return btn;
}
public double calc(double x, String input, char opt) {
inText.setFont(inText.getFont().deriveFont(Font.PLAIN));
double y = Double.parseDouble(input);
switch (opt) {
case '+':
return x + y;
case '-':
return x - y;
case '*':
return x * y;
case '/':
return x / y;
case '%':
return x % y;
case '^':
return Math.pow(x, y);
default:
inText.setFont(inText.getFont().deriveFont(Font.PLAIN));
return y;
}
}
private void repaintFont() {
inText.setFont(inText.getFont().deriveFont(Font.PLAIN));
}
private Consumer<ItemEvent> calcTypeSwitchEventConsumer = event -> {
if (event.getStateChange() != ItemEvent.SELECTED) return;
String selectedItem = (String) event.getItem();
switch (selectedItem) {
case "Standard":
window.setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
btnRoot.setVisible(false);
btnPower.setVisible(false);
btnLog.setVisible(false);
break;
case "Scientific":
window.setSize(WINDOW_WIDTH + 80, WINDOW_HEIGHT);
btnRoot.setVisible(true);
btnPower.setVisible(true);
btnLog.setVisible(true);
break;
}
};
private Consumer<ItemEvent> themeSwitchEventConsumer = event -> {
if (event.getStateChange() != ItemEvent.SELECTED) return;
String selectedTheme = (String) event.getItem();
switch (selectedTheme) {
case "Simple":
window.getContentPane().setBackground(null);
btnC.setBackground(null);
btnBack.setBackground(null);
btnMod.setBackground(null);
btnDiv.setBackground(null);
btnMul.setBackground(null);
btnSub.setBackground(null);
btnAdd.setBackground(null);
btnRoot.setBackground(null);
btnLog.setBackground(null);
btnPower.setBackground(null);
btnEqual.setBackground(null);
btn0.setBackground(null);
btn1.setBackground(null);
btn2.setBackground(null);
btn3.setBackground(null);
btn4.setBackground(null);
btn5.setBackground(null);
btn6.setBackground(null);
btn7.setBackground(null);
btn8.setBackground(null);
btn9.setBackground(null);
btnPoint.setBackground(null);
btnC.setForeground(Color.BLACK);
btnBack.setForeground(Color.BLACK);
btnMod.setForeground(Color.BLACK);
btnDiv.setForeground(Color.BLACK);
btnMul.setForeground(Color.BLACK);
btnSub.setForeground(Color.BLACK);
btnAdd.setForeground(Color.BLACK);
btnEqual.setForeground(Color.BLACK);
btnLog.setForeground(Color.BLACK);
btnPower.setForeground(Color.BLACK);
btnRoot.setForeground(Color.BLACK);
break;
}
};
public static void main(String[] args) {
new Calculator();
}
}