This post explains the most relevant concepts about the software needed to run and/or compile Java on a device. It also clarifies the differences between concepts like JVM, JRE, JDK, OpenJDK or Java SE. Java Platforms A Java platform is…
When referencing resources in a Java project, as for example photos, sound clips, video, etc., it is important to do it correctly because otherwise we may find errors when executing the application out of the IDE from a JAR file…
This post summarizes the types of software licenses. When comparing software licenses, some are more permissive or restrictive than others, indicating that the limitations of use are more expanded or limited. These licenses are introduced on this post in descending…
This post is about summarizing different ways to check if user is admin in Java Use system calls to check if user is admin A Java application can call system command through the class Runnable You can see this post…
This post explain different methods to call the operating system commands or native code from a Java application. Methods to call a native function Method 1. Use Runtime class Runtime class contains the exec method that allows the application to…
Packaging a Java App for Distribution on Windows There is a discussion about this topic on this link: Packaging a Java App for Distribution on Mac OS X Follow the instructions by Oracle: Packaging a Java App for…
This are the instructions to add an icon the a Java Swing application. Icon is loaded from an image. In order to load this image we make use of File and Buffered Image classes. Icon can be shown in different…
A developer may need to shut down a computer from a Java application. This post explains how it can be done. Ways to identify operating system In all solutions proposed here we are calling the OS directly to shutdown…
Images can be displayed in Java Swing using object JLabel. This is the partial code: JLabel label = new JLabel(); try { BufferedImage img = ImageIO.read(new File(IMG_FILES_PATH + IMG_FILENAME)); ImageIcon icon = new ImageIcon(img); label.setIcon(icon); } catch (IOException ex) {…
I programmed my own function, based on other examples: /** * Method that scale an image (BufferedImage) into the specified dimensions * @param sbi Source image * @param imageType Image type among BufferedImage.TYPE_… constants (example: TYPE_INT_ARGB) * @param dWidth Image…