What is the difference between “px”, “dip”, “dp” and “sp”?

From the Android Developer Documentation: px> Pixels – corresponds to actual pixels on the screen. in> Inches – based on the physical size of the screen.> 1 Inch = 2.54 centimeters mm> Millimeters – based on the physical size of the screen. pt> Points – 1/72 of an inch based on the physical size of the screen. dp or dip> Density-independent Pixels – an abstract unit that … Read more

How do you add an ActionListener onto a JButton in Java

Two ways: 1. Implement ActionListener in your class, then use jBtnSelection.addActionListener(this); Later, you’ll have to define a menthod, public void actionPerformed(ActionEvent e). However, doing this for multiple buttons can be confusing, because the actionPerformed method will have to check the source of each event (e.getSource()) to see which button it came from. 2. Use anonymous inner classes: Later, you’ll have to define selectionButtonPressed(). … Read more

How to easily print ascii-art text?

pyfiglet – pure Python implementation of http://www.figlet.org pip install pyfiglet termcolor – helper functions for ANSI color formatting pip install termcolor colorama – multiplatform support (Windows) pip install colorama Example $ python print-warning.py | cat .___ ___. __ _______. _______. __ __ _______ __ | \/ | | | / | / || | | … Read more

SVN admin management GUI tool

Look at visualsvn: VisualSVN Server is a package that contains everything you need to install, configure and manage Subversion server for your team on Windows platform. It includes Subversion, Apache and a management console. User-friendly Management Console Create, import and remove repositories Create and delete folders in repository Dashboard showing overview status of Subversion server Manage … Read more

trying to fix java Exception in thread “JavaFX Application Thread” java.lang.NullPointerException

If you look at the stacktrace the error is at RScene:107 and the caller is javafx. So the problem is not in the beginRace method and its caller raceStartScene. My guess is at this line (seems to be an attribute): you call implicitly calcRisk(td) when creating this object, you have no guarantee that td is … Read more