JLabel 对象可以显示文本、图像或同时显示二者。可以通过设置垂直和水平对齐方式,指定标签显示区中标签内容在何处对齐。默认情况下,标签在其显示区内垂直居中对齐。默认情况下,只显示文本的标签是开始边对齐;而只显示图像的标签则水平居中对齐。 还可以指定文本相对于图像的位置。默认情况下,文本位于图像的结尾边上,文本和图像都垂直对齐。 构造方法介绍:
常用方法:
在JLabel中增加图片和文本import java.awt.FlowLayout; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.SwingConstants; public class MixingIconLabel { public static void main(String[] args) { JFrame.setDefaultLookAndFeelDecorated(true); JFrame frame = new JFrame(); frame.setTitle("JLabel Test"); frame.setLayout(new FlowLayout()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); ImageIcon imageIcon = new ImageIcon("yourFile.gif"); JLabel label = new JLabel("Mixed", imageIcon, SwingConstants.RIGHT); frame.add(label); frame.pack(); frame.setVisible(true); } } JLabel中增加HTML文本import javax.swing.JFrame; import javax.swing.JLabel; public class HTMLLabel { public static void main(String[] a) { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JLabel label = new JLabel("<html>bold <br> plain</html>"); frame.add(label); frame.setSize(300, 200); frame.setVisible(true); } } 重写JLabelimport java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.io.Serializable; import javax.swing.JLabel; public class Colors extends JLabel implements Serializable { transient private Color color; // not persistent private boolean rectangular; // is persistent public Colors() { addMouseListener(new MouseAdapter() { public void mousePressed(MouseEvent me) { change(); } }); rectangular = false; setSize(200, 100); change(); } public boolean getRectangular() { return rectangular; } public void setRectangular(boolean flag) { this.rectangular = flag; repaint(); } public void change() { color = randomColor(); repaint(); } private Color randomColor() { int r = (int) (255 * Math.random()); int g = (int) (255 * Math.random()); int b = (int) (255 * Math.random()); return new Color(r, g, b); } public void paint(Graphics g) { Dimension d = getSize(); int h = d.height; int w = d.width; g.setColor(color); if (rectangular) { g.fillRect(0, 0, w - 1, h - 1); } else { g.fillOval(0, 0, w - 1, h - 1); } } } 将JLabel增加到JScrollPane中便于显示大图片import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JScrollPane; public class ScrollPaneFrame { public static void main(String[] args) { JFrame frame = new JFrame(); JLabel image = new JLabel(new ImageIcon("A.jpg")); frame.getContentPane().add(new JScrollPane(image)); frame.setSize(300, 300); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } } JLabel中增加unicode编码import java.awt.GridLayout; import javax.swing.JFrame; import javax.swing.JLabel; public class Unicode { public static void main(String args[]) { UnicodeJFrame unicodeJFrame = new UnicodeJFrame(); unicodeJFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); unicodeJFrame.setSize(350, 250); unicodeJFrame.setVisible(true); } } class UnicodeJFrame extends JFrame { public UnicodeJFrame() { super("Demonstrating Unicode"); setLayout(new GridLayout(8, 1)); JLabel englishJLabel = new JLabel("/u0057/u0065/u006C/u0063" + "/u006F/u006D/u0065/u0020/u0074/u006F/u0020Unicode/u0021"); englishJLabel.setToolTipText("This is English"); add(englishJLabel); JLabel chineseJLabel = new JLabel("/u6B22/u8FCE/u4F7F/u7528" + "/u0020/u0020Unicode/u0021"); chineseJLabel.setToolTipText("This is Traditional Chinese"); add(chineseJLabel); JLabel cyrillicJLabel = new JLabel("/u0414/u043E/u0431/u0440" + "/u043E/u0020/u043F/u043E/u0436/u0430/u043B/u043E/u0432" + "/u0430/u0422/u044A/u0020/u0432/u0020Unicode/u0021"); cyrillicJLabel.setToolTipText("This is Russian"); add(cyrillicJLabel); JLabel frenchJLabel = new JLabel("/u0042/u0069/u0065/u006E/u0076" + "/u0065/u006E/u0075/u0065/u0020/u0061/u0075/u0020Unicode/u0021"); frenchJLabel.setToolTipText("This is French"); add(frenchJLabel); JLabel germanJLabel = new JLabel("/u0057/u0069/u006C/u006B/u006F" + "/u006D/u006D/u0065/u006E/u0020/u007A/u0075/u0020Unicode/u0021"); germanJLabel.setToolTipText("This is German"); add(germanJLabel); JLabel japaneseJLabel = new JLabel("Unicode/u3078/u3087/u3045" + "/u3053/u305D/u0021"); japaneseJLabel.setToolTipText("This is Japanese"); add(japaneseJLabel); JLabel portugueseJLabel = new JLabel("/u0053/u00E9/u006A/u0061" + "/u0020/u0042/u0065/u006D/u0076/u0069/u006E/u0064/u006F/u0020" + "Unicode/u0021"); portugueseJLabel.setToolTipText("This is Portuguese"); add(portugueseJLabel); JLabel spanishJLabel = new JLabel("/u0042/u0069/u0065/u006E" + "/u0076/u0065/u006E/u0069/u0064/u0061/u0020/u0061/u0020" + "Unicode/u0021"); spanishJLabel.setToolTipText("This is Spanish"); add(spanishJLabel); } } |
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