java二、八、十进制计算器

下面是一个简单的Java二、八、十进制计算器，可以实现加、减、乘、除四则运算，同时支持二、八、十进制之间的相互转换：

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Stack;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Calculator {

    private JFrame frame;
    private JTextField inputField;
    private JLabel resultLabel;
    private JButton btnBin, btnOct, btnDec;
    private Stack<String> stack;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Calculator window = new Calculator();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public Calculator() {
        stack = new Stack<String>();
        initialize();
    }

    private void initialize() {
        frame = new JFrame();
        frame.setBounds(100, 100, 450, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);

        inputField = new JTextField();
        inputField.setBounds(10, 10, 414, 30);
        frame.getContentPane().add(inputField);
        inputField.setColumns(10);

        resultLabel = new JLabel("");
        resultLabel.setBounds(10, 50, 414, 30);
        frame.getContentPane().add(resultLabel);

        JButton btn0 = new JButton("0");
        btn0.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                inputField.setText(inputField.getText() + "0");
            }
        });
        btn0.setBounds(10, 90, 50, 30);
        frame.getContentPane().add(btn0);

        JButton btn1 = new JButton("1");
        btn1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                inputField.setText(inputField.getText() + "1");
            }
        });
        btn1.setBounds(70, 90, 50, 30);
        frame.getContentPane().add(btn1);

        JButton btn2 = new JButton("2");
        btn2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                inputField.setText(inputField.getText() + "2");
            }
        });
        btn2.setBounds(130, 90, 50, 30);
        frame.getContentPane().add(btn2);

        JButton btn3 = new JButton("3");
        btn3.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                inputField.setText(inputField.getText() + "3");
            }
        });
        btn3.setBounds(190, 90, 50, 30);
        frame.getContentPane().add(btn3);

        JButton btn4 = new JButton("4");
        btn4.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                inputField.setText(inputField.getText() + "4");
            }
        });
        btn4.setBounds(250, 90, 50, 30);
        frame.getContentPane().add(btn4);

        JButton btn5 = new JButton("5");
        btn5.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                inputField.setText(inputField.getText() + "5");
            }
        });
        btn5.setBounds(310, 90, 50, 30);
        frame.getContentPane().add(btn5);

        JButton btn6 = new JButton("6");
        btn6.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                inputField.setText(inputField.getText() + "6");
            }
        });
        btn6.setBounds(370, 90, 50, 30);
        frame.getContentPane().add(btn6);

        JButton btn7 = new JButton("7");
        btn7.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                inputField.setText(inputField.getText() + "7");
            }
        });
        btn7.setBounds(10, 130, 50, 30);
        frame.getContentPane().add(btn7);

        JButton btn8 = new JButton("8");
        btn8.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                inputField.setText(inputField.getText() + "8");
            }
        });
        btn8.setBounds(70, 130, 50, 30);
        frame.getContentPane().add(btn8);

        JButton btn9 = new JButton("9");
        btn9.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                inputField.setText(inputField.getText() + "9");
            }
        });
        btn9.setBounds(130, 130, 50, 30);
        frame.getContentPane().add(btn9);

        JButton btnAdd = new JButton("+");
        btnAdd.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                stack.push(inputField.getText());
                stack.push("+");
                inputField.setText("");
            }
        });
        btnAdd.setBounds(190, 130, 50, 30);
        frame.getContentPane().add(btnAdd);

        JButton btnSub = new JButton("-");
        btnSub.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                stack.push(inputField.getText());
                stack.push("-");
                inputField.setText("");
            }
        });
        btnSub.setBounds(250, 130, 50, 30);
        frame.getContentPane().add(btnSub);

        JButton btnMul = new JButton("*");
        btnMul.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                stack.push(inputField.getText());
                stack.push("*");
                inputField.setText("");
            }
        });
        btnMul.setBounds(310, 130, 50, 30);
        frame.getContentPane().add(btnMul);

        JButton btnDiv = new JButton("/");
        btnDiv.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                stack.push(inputField.getText());
                stack.push("/");
                inputField.setText("");
            }
        });
        btnDiv.setBounds(370, 130, 50, 30);
        frame.getContentPane().add(btnDiv);

        JButton btnEq = new JButton("=");
        btnEq.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                stack.push(inputField.getText());
                int result = calculate();
                resultLabel.setText(String.valueOf(result));
            }
        });
        btnEq.setBounds(310, 170, 110, 30);
        frame.getContentPane().add(btnEq);

        btnBin = new JButton("2进制");
        btnBin.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String text = inputField.getText();
                if (text.length() > 0) {
                    int value = Integer.parseInt(text);
                    inputField.setText(Integer.toBinaryString(value));
                }
            }
        });
        btnBin.setBounds(10, 170, 80, 30);
        frame.getContentPane().add(btnBin);

        btnOct = new JButton("8进制");
        btnOct.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String text = inputField.getText();
                if (text.length() > 0) {
                    int value = Integer.parseInt(text);
                    inputField.setText(Integer.toOctalString(value));
                }
            }
        });
        btnOct.setBounds(100, 170, 80, 30);
        frame.getContentPane().add(btnOct);

        btnDec = new JButton("10进制");
        btnDec.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String text = inputField.getText();
                if (text.length() > 0) {
                    int value = Integer.parseInt(text, 8); // 以8进制解析整数
                    inputField.setText(Integer.toString(value));
                }
            }
        });
        btnDec.setBounds(190, 170, 80, 30);
        frame.getContentPane().add(btnDec);
    }

    // 计算表达式的值
    private int calculate() {
        int result = 0;
        while (!stack.isEmpty()) {
            String op = stack.pop();
            if (op.equals("+")) {
                result += Integer.parseInt(stack.pop());
            } else if (op.equals("-")) {
                result -= Integer.parseInt(stack.pop());
            } else if (op.equals("*")) {
                result *= Integer.parseInt(stack.pop());
            } else if (op.equals("/")) {
                result /= Integer.parseInt(stack.pop());
            }
        }
        return result;
    }

}

注意：由于本程序采用了堆栈来实现运算，因此只支持单次运算，不能连续输入多个运算符进行复合运算。