带有HTML的JLabel包含“<”和“>”。人物 [英] JLabel with HTML containing "<" and ">" characters
问题描述
我的代码：
public static void main（String [] args）{
JFrame frame = new JFrame（）;
BoxLayout layout = new BoxLayout（frame.getContentPane（），BoxLayout.PAGE_AXIS）;
frame.getContentPane（）。setLayout（layout）;
JLabel lbl1 = new JLabel（< html>标签1：300> 100和90< 200< / html>）;
JLabel lbl2 = new JLabel（< html> Label 2：300& gt; 100 and 90& lt; 200< / html>）;
JLabel lbl3 = new JLabel（< html> Label 3：300 \\\> 100 and 90 \\\< 200< / html>）;
frame.add（lbl1）;
frame.add（lbl2）;
frame.add（lbl3）;
frame.pack（）;
frame.setVisible（true）;
}
任何人都可以解释我为什么在标签1和3中看到>字符，而<不可见？我假设<和u003C的解释方式完全一样， HTML字符不能被正确解释，但是如果是，为什么显示>，这也是HTML中的特殊字符？
& gt 只有正确的选项？
JLabel实现假定原始< 是html元素的无效开始标记的一部分，并将其删除。您可以使用& lt; 或&＃34; 。
From time to time I use HTML in JLabels in Java Swing. Lastly I've came across something a little bit, for me, confusing...
My code:
public static void main(String[] args) {
JFrame frame = new JFrame();
BoxLayout layout = new BoxLayout(frame.getContentPane(), BoxLayout.PAGE_AXIS);
frame.getContentPane().setLayout(layout);
JLabel lbl1 = new JLabel("<html>Label 1: 300 > 100 and 90 < 200 </html>");
JLabel lbl2 = new JLabel("<html>Label 2: 300 > 100 and 90 < 200 </html>");
JLabel lbl3 = new JLabel("<html>Label 3: 300 \u003E 100 and 90 \u003C 200 </html>");
frame.add(lbl1);
frame.add(lbl2);
frame.add(lbl3);
frame.pack();
frame.setVisible(true);
}
Could anyone explain me why in labels 1 and 3 I see ">" character, while "<" is not visible? I assume, that "<" and "u003C" are interpreted in exactly the same way, and as a special HTML character cannot be correctly interpreted, but if yes, why ">", which is also a special character in HTML, is displayed?
Are < and > the only correct options?
The JLabel implementation assumes a raw < was part of an invalid opening tag for an html element, and it drops it. You can use < or ".
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