Java程序设计复习提纲（下：图形界面）

import javax.swing.JFrame;
import javax.swing.JButton;

public class SimpleGUI {
    public static void main(String[] args) {
        // Create a new frame (a window)
        JFrame frame = new JFrame("My First GUI");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 200);

        // Create a new button
        JButton button = new JButton("Click me!");

        // Add the button to the frame
        frame.getContentPane().add(button);

        // Make the frame visible
        frame.setVisible(true);
    }
}

JFrame frame = new JFrame("Title");  // create a new frame with the title "Title"

JPanel panel = new JPanel();         // create a new panel

JDialog dialog = new JDialog(frame, "Dialog", true); // create a new modal dialog with the title "Dialog"

JScrollPane scrollPane = new JScrollPane(textArea);  // create a new scroll pane that contains a text area

JButton button = new JButton("Click me!");

JLabel label = new JLabel("Hello, World!");

JTextField textField = new JTextField(20); // 20 columns wide

JTextArea textArea = new JTextArea(5, 20); // 5 rows and 20 columns

JCheckBox checkBox = new JCheckBox("Check me");

JRadioButton radioButton = new JRadioButton("Select me");

String[] choices = {"Choice 1", "Choice 2", "Choice 3"};
JComboBox comboBox = new JComboBox(choices);

JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 50, 25); // min: 0, max: 50, initial: 25

JMenuBar menuBar = new JMenuBar();
JMenu menu = new JMenu("Menu");
JMenuItem menuItem = new JMenuItem("Menu Item");
menu.add(menuItem);
menuBar.add(menu);

FlowLayout flowLayout = new FlowLayout();
container.setLayout(flowLayout);

BorderLayout borderLayout = new BorderLayout();
container.setLayout(borderLayout);

GridLayout gridLayout = new GridLayout(3, 2); // 3 rows and 2 columns
container.setLayout(gridLayout);

BoxLayout boxLayout = new BoxLayout(container, BoxLayout.X_AXIS); // horizontal layout
container.setLayout(boxLayout);

GridBagLayout gridBagLayout = new GridBagLayout();
container.setLayout(gridBagLayout);

button.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
        // handle the button click
    }
});

button.addMouseListener(new MouseAdapter() {
    @Override
    public void mouseClicked(MouseEvent e) {
        // handle the mouse click
    }
});

textField.addKeyListener(new KeyAdapter() {
    @Override
    public void keyPressed(KeyEvent e) {
        // handle the key press
    }
});

checkBox.addItemListener(new ItemListener() {
    @Override
    public void itemStateChanged(ItemEvent e) {
        // handle the item state change
    }
});

frame.addWindowListener(new WindowAdapter() {
    @Override
    public void windowClosing(WindowEvent e) {
        // handle the window closing
    }
});

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

public class Calculator {
    public static void main(String[] args) {
        // 创建一个新的JFrame实例作为主窗口
        JFrame frame = new JFrame("Simple Calculator");

        // 创建一个新的JPanel实例作为主面板
        JPanel panel = new JPanel();

        // 设置主面板的布局为GridLayout
        panel.setLayout(new GridLayout(2, 3, 10, 10));

        // 创建组件
        JTextField textField1 = new JTextField(10);
        textField1.setFont(new Font("Arial", Font.PLAIN, 20));
        JTextField textField2 = new JTextField(10);
        textField2.setFont(new Font("Arial", Font.PLAIN, 20));
        JButton addButton = new JButton("+");
        addButton.setFont(new Font("Arial", Font.PLAIN, 30));
        JButton subtractButton = new JButton("-");
        subtractButton.setFont(new Font("Arial", Font.PLAIN, 30));
        JTextField resultField = new JTextField(10);
        resultField.setFont(new Font("Arial", Font.PLAIN, 20));
        resultField.setEditable(false);

        // 添加组件到主面板
        panel.add(textField1);
        panel.add(textField2);
        panel.add(resultField);
        panel.add(addButton);
        panel.add(subtractButton);

        // 添加事件监听器到加号按钮
        addButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    int num1 = Integer.parseInt(textField1.getText());
                    int num2 = Integer.parseInt(textField2.getText());
                    int sum = num1 + num2;
                    resultField.setText(Integer.toString(sum));
                } catch (NumberFormatException ex) {
                    JOptionPane.showMessageDialog(frame, "Invalid input. Please enter only integers.");
                    textField1.setText("");
                    textField2.setText("");
                }
            }
        });

        // 添加事件监听器到减号按钮
        subtractButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    int num1 = Integer.parseInt(textField1.getText());
                    int num2 = Integer.parseInt(textField2.getText());
                    int diff = num1 - num2;
                    resultField.setText(Integer.toString(diff));
                } catch (NumberFormatException ex) {
                    JOptionPane.showMessageDialog(frame, "Invalid input. Please enter only integers.");
                    textField1.setText("");
                    textField2.setText("");
                }
            }
        });

        // 将主面板添加到主窗口
        frame.add(panel);

        // 设置主窗口的大小、位置和关闭操作
        frame.setSize(600, 200);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // 显示主窗口
        frame.setVisible(true);
    }
}