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A Swing JLabel automatically interprets any text as HTML content, if it starts with <html>. If the content of this HTML is an image with invalid URL this will cause the whole GUI to hang since the ImageFetche which should load this image will quit by an NPE.
To reproduce this problem simply create a JLabel as follows
new JLabel("<html><img src='http:\\\\invalid\\url'>")
I know there is a client property to prevent the JLabel from interpreting HTML. But JLabel is the default renderer implementation for many Swing components(like JTree, JTable and so on) which makes this a problem for nearly any Swing application which allows user input. So instead of implementing tons of custom renderer I'm searching for a global solution to disable the HTML interpretation.
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We can also disable the cell editing inside a table by calling the editCellAt() method of JTable class and it must return false.
b) JLabel cannot be used as an alternative to JTextField.
JLabel is a component used for displaying a label for some components. It is commonly partnered with a text field or a password field. JTextField is an input component allowing users to add some text.
JLabel is a class of java Swing . JLabel is used to display a short string or an image icon. JLabel can display text, image or both . JLabel is only a display of text or image and it cannot get focus .
There is a way if you create your own look and feel.
I'm not sure how well this performs is this, but it works. Lets assume you will extend the "Classic Windows" L&F.You need at leas 2 classes
One is the Look&Feel itself, lets call it WindowsClassicLookAndFeelExt. You only need to override method initClassDefaults.
package testSwing;
import javax.swing.UIDefaults;
import com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel;
public class WindowsClassicLookAndFeelExt extends WindowsClassicLookAndFeel {
@Override protected void initClassDefaults(UIDefaults table){
super.initClassDefaults(table);
Object[] uiDefaults = { "LabelUI", WindowsLabelExtUI.class.getCanonicalName()};
table.putDefaults(uiDefaults);
}
}
You also need a WindowsLabelExtUI class to manage all JLabels and set the property:
package testSwing;
import javax.swing.JComponent;
import javax.swing.plaf.ComponentUI;
import com.sun.java.swing.plaf.windows.WindowsLabelUI;
public class WindowsLabelExtUI extends WindowsLabelUI{
static WindowsLabelExtUI singleton = new WindowsLabelExtUI();
public static ComponentUI createUI(JComponent c){
c.putClientProperty("html.disable", Boolean.TRUE);
return singleton;
}
}
And finally a test class when you set the theme as WindowsClassicLookAndFeelExt
package testSwing;
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.UIManager;
public class Main{
public static void main(String[] args){
try{ UIManager.setLookAndFeel(WindowsClassicLookAndFeelExt.class.getCanonicalName());
}catch (Exception e){
e.printStackTrace();
}
JFrame frame = new JFrame("JList Test");
frame.setLayout(new FlowLayout());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
String[] selections = {"<html><img src='http:\\\\invalid\\url'>", "<html><H1>Hello</h1></html>", "orange", "dark blue"};
JList list = new JList(selections);
list.setSelectedIndex(1);
System.out.println(list.getSelectedValue());
JLabel jLabel = new JLabel("<html><h2>standard Label</h2></html>");
frame.add(new JScrollPane(list));
frame.add(jLabel);
frame.pack();
frame.setVisible(true);
}
}
And you will see something like
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