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| import java.awt.*;
import java.util.HashMap;
import java.util.concurrent.atomic.AtomicReference;
import java.util.regex.Pattern;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import javax.swing.*;
public class Main {
private static final Pattern patternFunc = Pattern.compile("(?<=[^a-zA-Z])([a-z]{3,})(?=[^a-zA-Z])");
public static void main(String[] args) {
AtomicReference<Double> memoryVal = new AtomicReference<>((double) 0);
ScriptEngine engine = new ScriptEngineManager().getEngineByName("js");
JFrame frame = new JFrame("Calculator");
Container container = frame.getContentPane();
container.setLayout(null);
JPanel panelTextField = new JPanel(new FlowLayout());
panelTextField.setBounds(0, 0, 600, 30);
JTextField textField = new JTextField(52);
panelTextField.add(textField);
container.add(panelTextField);
JPanel panelButtonMemory = new JPanel(new GridLayout(1, 5));
panelButtonMemory.setBounds(0, 30, 600, 50);
Buttons.buttonMapMemory
.get("MC")
.addActionListener(e -> {
memoryVal.set(.0);
});
Buttons.buttonMapMemory
.get("MR")
.addActionListener(e -> {
textField.setText(String.valueOf(memoryVal.get()));
});
Buttons.buttonMapMemory
.get("M+")
.addActionListener(e -> {
memoryVal.updateAndGet(v -> v + Double.parseDouble(textField.getText()));
});
Buttons.buttonMapMemory
.get("M-")
.addActionListener(e -> {
memoryVal.updateAndGet(v -> v - Double.parseDouble(textField.getText()));
});
Buttons.buttonMapMemory
.get("MS")
.addActionListener(e -> {
memoryVal.set(Double.parseDouble(textField.getText()));
});
for (String text : Buttons.OPERAND_MEMORY) panelButtonMemory.add(Buttons.buttonMapMemory.get(text));
container.add(panelButtonMemory);
JPanel panelButtonAdvanced = new JPanel(new GridLayout(4, 5));
panelButtonAdvanced.setBounds(0, 100, 600, 300);
for (String text : Buttons.OPERAND_ADVANCED_FRONT) {
Buttons.buttonMapAdvancedFront
.get(text)
.addActionListener(e -> {
textField.setText(text + "(" + textField.getText() + ")");
});
}
for (String text : Buttons.OPERAND_ADVANCED_BACK) {
Buttons.buttonMapAdvancedBack
.get(text)
.addActionListener(e -> {
textField.setText(textField.getText() + text);
});
}
for (String text : Buttons.OPERAND_ADVANCED_BACK) panelButtonAdvanced.add(Buttons.buttonMapAdvancedBack.get(text));
for (String text : Buttons.OPERAND_ADVANCED_FRONT) panelButtonAdvanced.add(Buttons.buttonMapAdvancedFront.get(text));
container.add(panelButtonAdvanced);
JPanel panelButtonBasic = new JPanel(new GridLayout(4, 4));
panelButtonBasic.setBounds(0, 400, 600, 200);
for (String text : Buttons.OPERAND_BASIC) {
Buttons.buttonMapBasic
.get(text)
.addActionListener(
text.equals("=")
? e -> {
try {
String queryText = patternFunc.matcher(" " + proceedPow(textField.getText()) + " ").replaceAll("Math.$1").trim();
System.out.println("Calculating: " + queryText);
textField.setText(engine.eval(queryText).toString());
System.out.println("Finished.");
} catch (ScriptException ex) {
textField.setText(ex.getMessage());
throw new RuntimeException(ex);
}
}
: e -> {
textField.setText(textField.getText() + text);
}
);
}
for (String text : Buttons.OPERAND_BASIC) panelButtonBasic.add(Buttons.buttonMapBasic.get(text));
container.add(panelButtonBasic);
frame.setSize(606, 635);
frame.setResizable(false);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setVisible(true);
}
private static String proceedPow(String str) {
int idx = str.indexOf('^');
while (idx != -1) {
int l = idx - 1, r = idx + 1;
int cnt = 0;
boolean f = false;
while (l > 0) {
char nowChar = str.charAt(l);
--l;
if (nowChar == ')') {
++cnt;
if (!f) f = true;
continue;
}
if (nowChar == '(') {
--cnt;
if (f && cnt == 0) break;
continue;
}
if (Character.isDigit(nowChar) || Character.isAlphabetic(nowChar)) continue;
if (cnt == 0) {
++l;
break;
}
}
cnt = 0;
while (r < str.length() - 1) {
char nowChar = str.charAt(r);
++r;
if (nowChar == '(') {
++cnt;
if (!f) f = true;
continue;
}
if (nowChar == ')') {
--cnt;
if (f && cnt == 0) break;
continue;
}
if (Character.isDigit(nowChar) || Character.isAlphabetic(nowChar)) continue;
if (cnt == 0) {
--r;
break;
}
}
str = str.substring(0, l + 1) + "pow(" + str.substring(l + 1, idx) + "," + str.substring(idx + 1, r) + ")" + str.substring(r);
idx = str.indexOf('^');
}
return str;
}
}
final class Buttons {
public static final String[] OPERAND_MEMORY = { "MC", "MR", "M+", "M-", "MS" };
public static final String[] OPERAND_ADVANCED_FRONT = { "1/", "sqrt", "round", "ceil", "floor", "abs", "exp", "2^", "10^", "log", "sin", "cos", "tan", "asin", "acos", "atan" };
public static final String[] OPERAND_ADVANCED_BACK = { "^", "(", ")", "%" };
public static final String[] OPERAND_BASIC = { "7", "8", "9", "+", "4", "5", "6", "-", "1", "2", "3", "*", ".", "0", "=", "/" };
public static HashMap<String, JButton> buttonMapMemory = new HashMap<>();
public static HashMap<String, JButton> buttonMapAdvancedFront = new HashMap<>();
public static HashMap<String, JButton> buttonMapAdvancedBack = new HashMap<>();
public static HashMap<String, JButton> buttonMapBasic = new HashMap<>();
static {
for (String text : OPERAND_MEMORY) buttonMapMemory.put(text, new JButton(text));
for (String text : OPERAND_ADVANCED_BACK) buttonMapAdvancedBack.put(text, new JButton(text));
for (String text : OPERAND_ADVANCED_FRONT) buttonMapAdvancedFront.put(text, new JButton(text));
for (String text : OPERAND_BASIC) buttonMapBasic.put(text, new JButton(text));
}
}
|
