Darryl Burke

Regexes are fun!

(So are Streams...)

Thank you Stephan, I see where I went wrong.

Still assuming that only words with all-lowercase (i.e. [a-z]) are to be removed, how about this?public class UppercaseWords {  public static void main(String[] args) {    String sentence = "UPPERCASE some lowercase words WORDS";    System.out.println(sentence.replaceAll("(?:\\b)[a-z]*(?:\\b)", "").replaceAll(" (?= )", ""));  } }

Stephan van Hulst wrote:

Darryl Burke wrote:What's wrong with sentence.replaceAll("(?:\\b)[a-z]*(?:\\b)", "")?  And if the double spaces left behind are an issue, that could be chained to .replace("  ", " ").

That regular expression does not take into account that the sentence could consist of characters other than a-z, A-Z and spaces.

Ah, I see.

Stephan van Hulst wrote:Also, the second replace would have to be performed multiple times until there are no more changes.

Um, no.

String#replace(CharSequence target, CharSequence replacement) wrote:Replaces each substring of this string that matches the literal target sequence with the specified literal replacement sequence.

What's wrong with sentence.replaceAll("(?:\\b)[a-z]*(?:\\b)", "")?  And if the double spaces left behind are an issue, that could be chained to .replace("  ", " ").

Your problem lies in that the DocumentListener updates the slider value and the slider's ChangeListener tries to update the text field.  One way to get around this is to use a boolean flag.  Something likeprivate boolean interactive = true; : :   public void insertUpdate(DocumentEvent de) {      interactive = false;      // code to set the slider value      interactive = true;   } : :   private void sldRedStateChanged(javax.swing.event.ChangeEvent evt) {      if (interactive) {         txtRed.setText(Integer.toString(sldRed.getValue()));      }   } :This limited example assumes both listeners are in the same class and will need to be enhanced to work between classes.  I would probably approach this with a class containing ONE text field and ONE slider, possibly encased in a JPanel, and two anonymous listeners; then add three instances of the class to the GUI.

Campbell Ritchie wrote:I am pretty sure that is what I did.

Sorry, I was confused by this version you posted later.

Campbell Ritchie wrote:myTimer.addActionListener(   evt ->   {      for (Ball b : ballsList)      {         b.paintShape();      }      myPanel.repaint();   } );

Campbell Ritchie wrote:Since paintShape takes a Graphics parameter, can you simply use a method reference?

Probably not.  I plead guilty to not reading the method declaration in earlier posts, but if that method requires a Graphics reference, how would you invoke it from a Timer's ActionListener?  Rather, the Timer would simply repaint() the panel and paintComponent(...) would take care of the rest.

With Java8, why not replace the for-each loop with a Stream?  I guess this would do it:ballsList.stream().forEach(Ball::paintShape);

Hello Penney, and welcome to the Ranch!  You're probably adding the data to an instance of Gui_Main that is different from the one you have displayed.  I say 'probably' because the code snippets you have posted are really not enough to diagnose the problem.  To get better help sooner, post a SSCCE (Short, Self Contained, Correct (Compilable), Example).

Also, to conform to Java conventions, that class could be named GuiMain, not Gui_Main (it would be better still if the class name implied its purpose).  Your package names Parts, Products and Inventory should be lowercase i.e. parts, products, inventory.

Since this is a Swing and not a JavaFX question, I've added it to the correct section of the Ranch.

This question has been asked (and answered) before.

What output do you get for this code?System.out.println(Locale.getDefault()); System.out.println(Locale.getDefault(Locale.Category.DISPLAY));

Pierre-Yves Saumont wrote:I would be interested in knowing he exact version used.

C:\Program Files\Java\jdk1.8.0\bin>javac -version javac 1.8.0

Looks like a bug that was fixed in later updates.

I found that javac (jdk1.8.0) compiles it without reporting an error; NetBeans on the other hand flags the error mentioned by Pierre-Yves.

Use a java.util.Timer or a javax.swing.Timer, depending on your application.

Hi Carlos and welcome to the Ranch!  We have a page about How To Ask Questions On Java Ranch -- follow even half the advice enshrined there and you're gold!