使用 set action command，我们在这里展示了单击按钮时在控制台中显示的消息。首先设置按钮：JButton btn = new JButton("Demo Button");现在，设置 Action Listener 以在单击按钮时触发：ActionListener actionListener = new ActionListener() {    public void actionPerformed(ActionEvent event) {       String str = event.getActionCommand();       System.out.println("Clicked = " + str);    } };以下是如何在 JButton 中设置操作命令的示例：示例import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JOptionPane; public class SwingDemo {    public static void main(final String args[]) {       JButton btn ... 阅读更多

对于按钮边框，在 Java 中使用 createLineBorder() 方法，该方法允许您设置边框的颜色：JButton button = new JButton("Demo Button!"); Border border = BorderFactory.createLineBorder(Color.BLUE);以下是如何在 Java 中更改按钮边框的示例：示例import java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.border.Border; public class SwingDemo {    public static void main(String args[]) {       JFrame frame = new JFrame("Button Border");       Container container = frame.getContentPane();       JButton button = new JButton("Demo Button!");       Border border = BorderFactory.createLineBorder(Color.BLUE);       button.setBorder(border);   ... 阅读更多

以下是为按钮添加动作监听器的示例：示例package my; import java.awt.*; import java.awt.event.*; import javax.swing.*; public class SwingDemo {    private JFrame frame;    private JLabel headerLabel;    private JLabel statusLabel;    private JPanel controlPanel;    public SwingDemo(){       prepareGUI();    }    public static void main(String[] args){       SwingDemo swingControlDemo = new SwingDemo();       swingControlDemo.showButtonDemo();    }    private void prepareGUI(){       frame = new JFrame("Java Swing");       frame.setSize(500, 500);       frame.setLayout(new GridLayout(3, 1));       frame.addWindowListener(new WindowAdapter() {         ... 阅读更多

是的，我们可以使用 Java 中的 ImageIO 类获取支持的图像类型。以下是获取 Java 中支持的图像类型的示例：示例package my; import javax.imageio.ImageIO; public class SwingDemo {    public static void main(String[] args) throws Exception {       String[] imgTypes = ImageIO.getReaderFileSuffixes();       System.out.print("Supported Image Types = ");       for (String type : imgTypes) {          System.out.print("" + type);       }    } }输出Supported Image Types = jpg tif tiff bmp gif png wbmp jpeg

在这里，我们在 JComboBox 上创建柔和斜面边框：JComboBox comboBox = new JComboBox(list);现在，设置斜面边框：comboBox.setBorder(new SoftBevelBorder(BevelBorder.LOWERED));以下是在 Swing 中使用柔和斜面边框的示例：示例import java.awt.Font; import java.awt.GridBagLayout; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.border.BevelBorder; import javax.swing.border.SoftBevelBorder; public class SwingDemo {    static final String list[] = { "One", "Two", "Three", "Four", "Five", "Six" };    public static void main(String[] args) {       JFrame window = new JFrame("ComboBox Example");       JPanel panel = new JPanel();       panel.setLayout(new GridBagLayout());       JComboBox comboBox = new JComboBox(list);       comboBox.setBorder(new ... 阅读更多

让我们首先创建一个 JPanel 并设置标题边框：JPanel panel = new JPanel(); panel.setBorder(BorderFactory.createTitledBorder("Demo Panel"));现在创建 Empty Border：JPanel panel2 = new JPanel(new BorderLayout()); panel2.add(panel, BorderLayout.CENTER); panel2.setBorder(BorderFactory.createEmptyBorder(100, 100, 100, 100));以下是如何在 Java Swing 中使用 EmptyBorder 留出空间的示例：示例import java.awt.BorderLayout; import java.awt.Dimension; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JPanel; public class SwingDemo {    public static void main(String[] args) {       JPanel panel = new JPanel();       panel.setBorder(BorderFactory.createTitledBorder("Demo Panel"));       JPanel panel2 = new JPanel(new BorderLayout());       panel2.add(panel, BorderLayout.CENTER);       panel2.setBorder(BorderFactory.createEmptyBorder(100, 100, 100, 100));       ... 阅读更多

让我们首先创建一个框架：JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setUndecorated(true);现在，创建圆角边框：double x = 50; double y = 50; frame.setShape(new RoundRectangle2D.Double(x, y, 100, 100, 50, 50));以下是在 Swing 中创建圆角边框的示例：示例import java.awt.geom.RoundRectangle2D; import javax.swing.JFrame; import javax.swing.JPanel; public class SwingDemo extends JPanel {    public static void main(String[] args) {       JFrame frame = new JFrame();       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);       frame.setUndecorated(true);       double x = 50;       double y = 50;       frame.setShape(new RoundRectangle2D.Double(x, y, 100, 100, 50, 50));     ... 阅读更多

要将标题边框设置为面板，让我们首先为 Java Swing 应用程序创建一个面板：JPanel panel = new Jpanel(new BorderLayout());现在，设置标题边框：panel.setBorder(new TitledBorder("Displaying Titled Border"));以下是在 Swing 中向面板添加标题边框的示例：示例import java.awt.BorderLayout; import javax.swing.JButton; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.border.TitledBorder; public class SwingDemo {    public static void main(String[] args) {       JPanel panel = new JPanel(new BorderLayout());       panel.setBorder(new TitledBorder("Displaying Titled Border"));       panel.add(new JButton("Demo Button"), BorderLayout.SOUTH);       JOptionPane.showMessageDialog(null, panel);    } }输出阅读更多

要为您的 Java Swing 应用程序设置全屏模式，请使用 setFullScreenWindow() 方法：GraphicsDevice device = graphics.getDefaultScreenDevice(); JFrame frame = new JFrame("Fullscreen"); device.setFullScreenWindow(frame);以下是如何为 Java Swing 应用程序设置全屏模式的示例：示例import java.awt.Color; import java.awt.GraphicsDevice; import java.awt.GraphicsEnvironment; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; public class SwingDemo {    public static void main(String[] args) {       GraphicsEnvironment graphics =       GraphicsEnvironment.getLocalGraphicsEnvironment();       GraphicsDevice device = graphics.getDefaultScreenDevice();       JFrame frame = new JFrame("Fullscreen");       JPanel panel = new JPanel();       JLabel label = new JLabel("", JLabel.CENTER);     ... 阅读更多

首先，设置要在其上显示自定义光标的标签：JLabel label = new JLabel("Demo text! Hand cursor is visible on hover...");现在，将光标设置为显示为手形光标，而不是默认光标：label.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));以下是如何在用户将鼠标移到某些文本上时显示自定义光标的示例：示例import java.awt.Cursor; import javax.swing.JDialog; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; public class SwingDemo extends JFrame {    private void ShowDialog() {       JLabel label = new JLabel("Demo text! Hand cursor is visible on hover...");       label.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));   ... 阅读更多