java实现简易计算器 设计和编写一个简易的计算器：实现计算器的界面；实现计算按钮不同的计算功能；显示计算器按钮运算后的结果。

以下是一个简易计算器的Java代码示例：

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

public class SimpleCalculator implements ActionListener {

    JFrame frame;
    JTextField textField;
    JButton[] numberButtons = new JButton[10];
    JButton[] functionButtons = new JButton[8];
    JButton addButton, subButton, mulButton, divButton;
    JButton decButton, equButton, delButton, clrButton;

    JPanel panel;

    double num1 = 0, num2 = 0, result = 0;
    char operator;

    SimpleCalculator() {

        frame = new JFrame("Simple Calculator");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(420, 550);
        frame.setLayout(null);

        textField = new JTextField();
        textField.setBounds(50, 25, 300, 50);
        textField.setFont(new Font("Arial", Font.BOLD, 30));
        textField.setEditable(false);

        addButton = new JButton("+");
        subButton = new JButton("-");
        mulButton = new JButton("*");
        divButton = new JButton("/");
        decButton = new JButton(".");
        equButton = new JButton("=");
        delButton = new JButton("Delete");
        clrButton = new JButton("Clear");

        functionButtons[0] = addButton;
        functionButtons[1] = subButton;
        functionButtons[2] = mulButton;
        functionButtons[3] = divButton;
        functionButtons[4] = decButton;
        functionButtons[5] = equButton;
        functionButtons[6] = delButton;
        functionButtons[7] = clrButton;

        for (int i = 0; i < 8; i++) {
            functionButtons[i].addActionListener(this);
            functionButtons[i].setFont(new Font("Arial", Font.PLAIN, 18));
            functionButtons[i].setFocusable(false);
        }

        for (int i = 0; i < 10; i++) {
            numberButtons[i] = new JButton(String.valueOf(i));
            numberButtons[i].addActionListener(this);
            numberButtons[i].setFont(new Font("Arial", Font.PLAIN, 18));
            numberButtons[i].setFocusable(false);
        }

        delButton.setBounds(50, 430, 145, 50);
        clrButton.setBounds(205, 430, 145, 50);

        panel = new JPanel();
        panel.setBounds(50, 100, 300, 300);
        panel.setLayout(new GridLayout(4, 4, 10, 10));

        panel.add(numberButtons[1]);
        panel.add(numberButtons[2]);
        panel.add(numberButtons[3]);
        panel.add(addButton);

        panel.add(numberButtons[4]);
        panel.add(numberButtons[5]);
        panel.add(numberButtons[6]);
        panel.add(subButton);

        panel.add(numberButtons[7]);
        panel.add(numberButtons[8]);
        panel.add(numberButtons[9]);
        panel.add(mulButton);

        panel.add(decButton);
        panel.add(numberButtons[0]);
        panel.add(equButton);
        panel.add(divButton);

        frame.add(panel);
        frame.add(delButton);
        frame.add(clrButton);
        frame.add(textField);
        frame.setVisible(true);

    }

    public static void main(String[] args) {

        SimpleCalculator calculator = new SimpleCalculator();

    }

    @Override
    public void actionPerformed(ActionEvent e) {

        for (int i = 0; i < 10; i++) {
            if (e.getSource() == numberButtons[i]) {
                textField.setText(textField.getText().concat(String.valueOf(i)));
            }
        }

        if (e.getSource() == decButton) {
            textField.setText(textField.getText().concat("."));
        }

        if (e.getSource() == addButton) {
            num1 = Double.parseDouble(textField.getText());
            operator = '+';
            textField.setText("");
        }

        if (e.getSource() == subButton) {
            num1 = Double.parseDouble(textField.getText());
            operator = '-';
            textField.setText("");
        }

        if (e.getSource() == mulButton) {
            num1 = Double.parseDouble(textField.getText());
            operator = '*';
            textField.setText("");
        }

        if (e.getSource() == divButton) {
            num1 = Double.parseDouble(textField.getText());
            operator = '/';
            textField.setText("");
        }

        if (e.getSource() == equButton) {
            num2 = Double.parseDouble(textField.getText());

            switch (operator) {
                case '+':
                    result = num1 + num2;
                    break;
                case '-':
                    result = num1 - num2;
                    break;
                case '*':
                    result = num1 * num2;
                    break;
                case '/':
                    result = num1 / num2;
                    break;
            }

            textField.setText(String.valueOf(result));
            num1 = result;
        }

        if (e.getSource() == clrButton) {
            textField.setText("");
        }

        if (e.getSource() == delButton) {
            String string = textField.getText();
            textField.setText("");
            for (int i = 0; i < string.length() - 1; i++) {
                textField.setText(textField.getText() + string.charAt(i));
            }
        }

    }
}

这个计算器使用了Java Swing库来创建UI界面，包括文本框和按钮。按钮被分为数字按钮和功能按钮，数字按钮是 0-9 的数字，而功能按钮则执行不同的操作，如加、减、乘、除、小数点、等于号、清除和删除。在 `actionPerformed()` 方法中，我们检查哪个按钮被按下，然后根据不同的情况执行相应的操作。最后，我们将结果显示在文本框中。