fx计算器

1/src/Calculator/Calculator.java

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+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class Calculator extends JFrame implements ActionListener {
+    // Display screen
+    JTextField display;
+    // Buttons for digits and operations
+    JButton[] numberButtons;
+    JButton[] functionButtons;
+    JButton add, sub, mul, div, equal, clear, decimal;
+    JPanel panel;
+    double num1 = 0, num2 = 0, result = 0;
+    char operator;
+    boolean start;
+
+    public Calculator() {
+        // Set the title of the frame
+        setTitle("Calculator");
+        // Set the default close operation
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        // Set the size of the frame
+        setSize(400, 500);
+        // Set the layout of the frame
+        setLayout(null);
+
+        // Create display screen
+        display = new JTextField();
+        display.setBounds(30, 50, 320, 50);
+        display.setFont(new Font("Arial", Font.BOLD, 24));
+        display.setEditable(false);
+        add(display);
+
+        // Create buttons
+        numberButtons = new JButton[10];
+        functionButtons = new JButton[5];
+
+        for (int i = 0; i < 10; i++) {
+            numberButtons[i] = new JButton(String.valueOf(i));
+            numberButtons[i].setFont(new Font("Arial", Font.BOLD, 24));
+            numberButtons[i].addActionListener(this);
+        }
+
+        add = new JButton("+");
+        sub = new JButton("-");
+        mul = new JButton("*");
+        div = new JButton("/");
+        equal = new JButton("=");
+        clear = new JButton("C");
+        decimal = new JButton(".");
+
+        add.setFont(new Font("Arial", Font.BOLD, 24));
+        sub.setFont(new Font("Arial", Font.BOLD, 24));
+        mul.setFont(new Font("Arial", Font.BOLD, 24));
+        div.setFont(new Font("Arial", Font.BOLD, 24));
+        equal.setFont(new Font("Arial", Font.BOLD, 24));
+        clear.setFont(new Font("Arial", Font.BOLD, 24));
+        decimal.setFont(new Font("Arial", Font.BOLD, 24));
+
+        functionButtons[0] = add;
+        functionButtons[1] = sub;
+        functionButtons[2] = mul;
+        functionButtons[3] = div;
+        functionButtons[4] = equal;
+
+        for (int i = 0; i < 5; i++) {
+            functionButtons[i].addActionListener(this);
+        }
+
+        clear.addActionListener(this);
+        decimal.addActionListener(this);
+
+        // Set bounds and add buttons to panel
+        panel = new JPanel();
+        panel.setBounds(30, 120, 320, 300);
+        panel.setLayout(new GridLayout(4, 4, 10, 10));
+
+        panel.add(numberButtons[1]);
+        panel.add(numberButtons[2]);
+        panel.add(numberButtons[3]);
+        panel.add(add);
+
+        panel.add(numberButtons[4]);
+        panel.add(numberButtons[5]);
+        panel.add(numberButtons[6]);
+        panel.add(sub);
+
+        panel.add(numberButtons[7]);
+        panel.add(numberButtons[8]);
+        panel.add(numberButtons[9]);
+        panel.add(mul);
+
+        panel.add(decimal);
+        panel.add(numberButtons[0]);
+        panel.add(equal);
+        panel.add(div);
+
+        panel.add(clear);
+
+        add(panel);
+
+        // Set visibility of the frame
+        setVisible(true);
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        for (int i = 0; i < 10; i++) {
+            if (e.getSource() == numberButtons[i]) {
+                display.setText(display.getText() + i);
+            }
+        }
+
+        if (e.getSource() == add) {
+            num1 = Double.parseDouble(display.getText());
+            operator = '+';
+            display.setText("");
+            start = true;
+        }
+
+        if (e.getSource() == sub) {
+            num1 = Double.parseDouble(display.getText());
+            operator = '-';
+            display.setText("");
+            start = true;
+        }
+
+        if (e.getSource() == mul) {
+            num1 = Double.parseDouble(display.getText());
+            operator = '*';
+            display.setText("");
+            start = true;
+        }
+
+        if (e.getSource() == div) {
+            num1 = Double.parseDouble(display.getText());
+            operator = '/';
+            display.setText("");
+            start = true;
+        }
+
+        if (e.getSource() == equal) {
+            num2 = Double.parseDouble(display.getText());
+
+            switch (operator) {
+                case '+':
+                    result = num1 + num2;
+                    break;
+                case '-':
+                    result = num1 - num2;
+                    break;
+                case '*':
+                    result = num1 * num2;
+                    break;
+                case '/':
+                    result = num1 / num2;
+                    break;
+            }
+
+            display.setText(String.valueOf(result));
+            start = false;
+        }
+
+        if (e.getSource() == clear) {
+            display.setText("");
+            num1 = 0;
+            num2 = 0;
+            result = 0;
+            start = false;
+        }
+
+        if (e.getSource() == decimal) {
+            display.setText(display.getText() + ".");
+        }
+    }
+
+    public static void main(String[] args) {
+        new Calculator();
+    }
+}