Java做出简单的计算器带有自定义布局，swing按钮

好的，下面是一个简单的Java计算器的代码，使用了Swing布局和按钮：

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Calculator extends JFrame implements ActionListener {
    private JTextField textField;
    private JPanel buttonPanel;

    public Calculator() {
        super("Calculator");

        // 创建文本框和按钮面板
        textField = new JTextField();
        buttonPanel = new JPanel(new GridLayout(4, 4));

        // 添加按钮
        addButton("7");
        addButton("8");
        addButton("9");
        addButton("/");
        addButton("4");
        addButton("5");
        addButton("6");
        addButton("*");
        addButton("1");
        addButton("2");
        addButton("3");
        addButton("-");
        addButton("0");
        addButton(".");
        addButton("C");
        addButton("+");

        // 设置布局
        setLayout(new BorderLayout());
        add(textField, BorderLayout.NORTH);
        add(buttonPanel, BorderLayout.CENTER);

        // 设置窗口属性
        setSize(300, 300);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    // 添加按钮的方法
    private void addButton(String label) {
        JButton button = new JButton(label);
        button.addActionListener(this);
        buttonPanel.add(button);
    }

    // 处理按钮点击事件的方法
    public void actionPerformed(ActionEvent e) {
        String command = e.getActionCommand();

        if (command.equals("C")) {
            textField.setText("");
        } else if (command.equals("=")) {
            String expression = textField.getText();
            try {
                double result = evaluate(expression);
                textField.setText(Double.toString(result));
            } catch (Exception ex) {
                textField.setText("Error");
            }
        } else {
            textField.setText(textField.getText() + command);
        }
    }

    // 计算表达式的方法
    private double evaluate(String expression) throws Exception {
        return new Object() {
            int pos = -1, ch;

            void nextChar() {
                ch = (++pos < expression.length()) ? expression.charAt(pos) : -1;
            }

            boolean skip(char c) {
                while (ch == ' ') nextChar();
                if (ch == c) {
                    nextChar();
                    return true;
                }
                return false;
            }

            double parse() throws Exception {
                nextChar();
                double x = parseExpression();
                if (pos < expression.length()) throw new Exception("Unexpected: " + (char)ch);
                return x;
            }

            double parseExpression() throws Exception {
                double x = parseTerm();
                for (;;) {
                    if      (skip('+')) x += parseTerm(); // addition
                    else if (skip('-')) x -= parseTerm(); // subtraction
                    else return x;
                }
            }

            double parseTerm() throws Exception {
                double x = parseFactor();
                for (;;) {
                    if      (skip('*')) x *= parseFactor(); // multiplication
                    else if (skip('/')) x /= parseFactor(); // division
                    else return x;
                }
            }

            double parseFactor() throws Exception {
                if (skip('+')) return parseFactor(); // unary plus
                if (skip('-')) return -parseFactor(); // unary minus

                double x;
                int startPos = this.pos;
                if (skip('(')) { // parentheses
                    x = parseExpression();
                    skip(')');
                } else if ((ch >= '0' && ch <= '9') || ch == '.') { // numbers
                    while ((ch >= '0' && ch <= '9') || ch == '.') nextChar();
                    x = Double.parseDouble(expression.substring(startPos, this.pos));
                } else if (ch >= 'a' && ch <= 'z') { // functions
                    while (ch >= 'a' && ch <= 'z') nextChar();
                    String func = expression.substring(startPos, this.pos);
                    x = parseFactor();
                    if (func.equals("sqrt")) x = Math.sqrt(x);
                    else if (func.equals("sin")) x = Math.sin(Math.toRadians(x));
                    else if (func.equals("cos")) x = Math.cos(Math.toRadians(x));
                    else if (func.equals("tan")) x = Math.tan(Math.toRadians(x));
                    else throw new Exception("Unknown function: " + func);
                } else {
                    throw new Exception("Unexpected: " + (char)ch);
                }

                if (skip('^')) x = Math.pow(x, parseFactor()); // exponentiation

                return x;
            }
        }.parse();
    }

    public static void main(String[] args) {
        new Calculator();
    }
}

这个计算器使用了一个中缀表达式求值算法来计算表达式的值。你可以根据自己的需要修改它的布局和按钮。