Use the [isSelected][1] method.

You can also use an [ItemListener][2] so you&#39;ll be notified when it&#39;s checked or unchecked.


  [1]: http://docs.oracle.com/javase/7/docs/api/javax/swing/AbstractButton.html#isSelected%28%29
  [2]: http://docs.oracle.com/javase/7/docs/api/java/awt/event/ItemListener.html

By using `itemStateChanged(ItemListener)` you can track selecting and deselecting checkbox (and do whatever you want based on it):

    myCheckBox.addItemListener(new ItemListener() {
	    @Override
    	public void itemStateChanged(ItemEvent e) {
	    	if(e.getStateChange() == ItemEvent.SELECTED) {//checkbox has been selected
		    	//do something...
    		} else {//checkbox has been deselected
	    		//do something...
		    };
    	}
    });

Java Swing [itemStateChanged docu][1] should help too. By using `isSelected()` method you can just test if actual is checkbox selected:

    if(myCheckBox.isSelected()){_do_something_if_selected_}

  [1]: https://docs.oracle.com/javase/tutorial/uiswing/events/itemlistener.html

I am using idea 9.0.3 which is the latest release. When I write some scala source code in Idea, it takes several seconds to compile and run. This shouldn&#39;t be that slow, Is this normal?

Why does IntelliJ IDEA compile Scala so slowly?

The standard way would be the following:

    if (ptrace(PTRACE_TRACEME, 0, NULL, 0) == -1)
      printf(&quot;traced!\n&quot;);

In this case, ptrace returns an error if the current process is traced (e.g., running it with GDB or attaching to it).

But there is a serious problem with this: if the call returns successfully, GDB may not attach to it later. Which is a problem since I&#39;m not trying to implement anti-debug stuff. My purpose is to emit an &#39;int 3&#39; when a condition is met (e.g., an assert fails) and GDB is running (otherwise I get a SIGTRAP which stops the application).

Disabling SIGTRAP and emitting an &#39;int 3&#39; every time is not a good solution because the application I&#39;m testing might be using SIGTRAP for some other purpose (in which case I&#39;m still screwed, so it wouldn&#39;t matter, but it&#39;s the principle of the thing :))





How to detect if the current process is being run by GDB

How can I check if a `JCheckBox` is checked?

How to check that a JCheckBox is checked?

<p>How can I check if a <code>JCheckBox</code> is checked?</p>


What is the difference between `CharSequence[]` and `String[]`?

What is the difference between CharSequence[] and a String[]?

If I have a `Map` like this:

    HashMap&lt;Integer, ComparableObject&gt; map;

and I want to obtain a collection of values sorted using natural ordering, which method is fastest?
  
## (A) ##
Create an instance of a sortable collection like `ArrayList`, add the values, then sort it:

    List&lt;ComparableObject&gt; sortedCollection = new ArrayList&lt;ComparableObject&gt;(map.values());
    Collections.sort(sortedCollection);

## (B) ##
Create an instance of an ordered collection like `TreeSet`, then add the values:

    Set&lt;ComparableObject&gt; sortedCollection = new TreeSet&lt;ComparableObject&gt;(map.values());

  
Note that the resulting collection is never modified, so the sorting only needs to take place once.

Is it faster to add to a collection then sort it, or add to a sorted collection?

In my Java application, I was able to get the `Color` of a `JButton` in terms of red, green and blue; I have stored these values in three `int`s.

How do I convert those RGB values into a `String` containing the equivalent hexadecimal representation? Such as `#0033fA`

Convert a RGB Color Value to a Hexadecimal String

Is it possible to merge iterators in Java? I have two iterators and I want to combine/merge them so that I could iterate though their elements in one go (in same loop) rather than two steps. Is that possible? 

Note that the number of elements in the two lists can be different therefore one loop over both lists is not the solution. 

    Iterator&lt;User&gt; pUsers = userService.getPrimaryUsersInGroup(group.getId());
    Iterator&lt;User&gt; sUsers = userService.getSecondaryUsersInGroup(group.getId());
    
    while(pUsers.hasNext()) {
      User user = pUsers.next();
      .....
    }

    while(sUsers.hasNext()) {
      User user = sUsers.next();
      .....
    }



Is it possible to merge iterators in Java?

Should I check in my .project and .classpath files?

My friend told me that I should only check in .java files and the build.xml to guarantee portability. He said &quot;.classpath will cause you much less portability on different environment. .project is entirely your local eclipse setting&quot;

I agree with him, but partially. 

-- Not checking in .project file will make my development less efficient (I can&#39;t simply &quot;import&quot; a project code from a directory)

-- Not checking in .classpath file seems OK to me (?) if my build.xml is written carefully.

Anyone wants to share their experience here?

Java project: should .classpath .project file be committed into repository?

How can one get the screen resolution (width x height) in pixels?

I am using a JFrame and the java swing methods.

How can I get screen resolution in java?

I want the message box to appear immediately after the user changes the value in the textfield. Currently, I need to hit the enter key to get the message box to pop out. Is there anything wrong with my code?

    textField.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent e) {

            if (Integer.parseInt(textField.getText())&lt;=0){
                JOptionPane.showMessageDialog(null,
                        &quot;Error: Please enter number bigger than 0&quot;, &quot;Error Message&quot;,
                        JOptionPane.ERROR_MESSAGE);
            }       
        }
    }

Any help would be appreciated!

Value Change Listener to JTextField

I am developing a desktop application with Java Swing for my personal use.I am in need of some beautiful Look and Feel for my application. How can I do it using Java or a 3rd party API?

Java Look and Feel (L&amp;F) 

I want to know how can we perform action when mouse is double clicked in a component.

identifying double click in java


Both ActionListener and ItemListener are used to fire an event with JCheckBox? 

So, what&#39;s the difference between them and in which case one of them is preferred to the other?

Content Type	Original Author	Original Content on Stackoverflow
Question	oneat	View Question on Stackoverflow
Solution 1 - Java	Matthew Flaschen	View Answer on Stackoverflow
Solution 2 - Java	1ac0	View Answer on Stackoverflow

How to check that a JCheckBox is checked?

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

How to detect if the current process is being run by GDB

Why does IntelliJ IDEA compile Scala so slowly?

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