用java实现一个能够进行各种进位计数制的转换应用程序事件处理

好的，以下是Java实现进制转换的示例代码：

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

public class NumberSystemConverter extends JFrame implements ActionListener {

    private JTextField inputField;
    private JTextField outputField;
    private JComboBox<String> fromComboBox;
    private JComboBox<String> toComboBox;
    private JButton convertButton;

    public NumberSystemConverter() {
        setTitle("Number System Converter");
        setSize(400, 150);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);

        JPanel panel = new JPanel(new GridBagLayout());
        GridBagConstraints constraints = new GridBagConstraints();
        constraints.fill = GridBagConstraints.HORIZONTAL;
        constraints.weightx = 1;

        inputField = new JTextField(10);
        outputField = new JTextField(10);
        outputField.setEditable(false);
        fromComboBox = new JComboBox<String>(new String[]{"Decimal", "Binary", "Octal", "Hexadecimal"});
        toComboBox = new JComboBox<String>(new String[]{"Decimal", "Binary", "Octal", "Hexadecimal"});
        convertButton = new JButton("Convert");
        convertButton.addActionListener(this);

        constraints.gridx = 0;
        constraints.gridy = 0;
        panel.add(inputField, constraints);

        constraints.gridx = 1;
        panel.add(fromComboBox, constraints);

        constraints.gridx = 2;
        panel.add(toComboBox, constraints);

        constraints.gridx = 3;
        panel.add(convertButton, constraints);

        constraints.gridx = 0;
        constraints.gridy = 1;
        panel.add(outputField, constraints);

        add(panel);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        try {
            String input = inputField.getText();
            int from = fromComboBox.getSelectedIndex();
            int to = toComboBox.getSelectedIndex();
            String output = "";

            switch (from) {
                case 0: // Decimal
                    switch (to) {
                        case 0: output = input; break;
                        case 1: output = Integer.toBinaryString(Integer.parseInt(input)); break;
                        case 2: output = Integer.toOctalString(Integer.parseInt(input)); break;
                        case 3: output = Integer.toHexString(Integer.parseInt(input)); break;
                    }
                    break;

                case 1: // Binary
                    switch (to) {
                        case 0: output = Integer.toString(Integer.parseInt(input, 2)); break;
                        case 1: output = input; break;
                        case 2: output = Integer.toOctalString(Integer.parseInt(input, 2)); break;
                        case 3: output = Integer.toHexString(Integer.parseInt(input, 2)); break;
                    }
                    break;

                case 2: // Octal
                    switch (to) {
                        case 0: output = Integer.toString(Integer.parseInt(input, 8)); break;
                        case 1: output = Integer.toBinaryString(Integer.parseInt(input, 8)); break;
                        case 2: output = input; break;
                        case 3: output = Integer.toHexString(Integer.parseInt(input, 8)); break;
                    }
                    break;

                case 3: // Hexadecimal
                    switch (to) {
                        case 0: output = Integer.toString(Integer.parseInt(input, 16)); break;
                        case 1: output = Integer.toBinaryString(Integer.parseInt(input, 16)); break;
                        case 2: output = Integer.toOctalString(Integer.parseInt(input, 16)); break;
                        case 3: output = input; break;
                    }
                    break;
            }

            outputField.setText(output);
        } catch (NumberFormatException ex) {
            outputField.setText("Invalid input");
        }
    }

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

该应用程序界面包含两个文本框，分别用于输入和输出转换的数字，以及两个下拉框，用于选择输入和输出的进制类型。当用户单击“Convert”按钮时，程序将根据选择的进制类型将输入的数字转换为所需的进制，并在输出文本框中显示结果。此示例支持四种进制类型：十进制、二进制、八进制和十六进制。