This week's giveaway is in the Java/Jakarta EE forum. We're giving away four copies of Java EE 8 High Performance and have Romain Manni-Bucau on-line! See java commands get width and get height elsewhere in my application so that the window I create in a project automatically adjusts to fill the operator's screen but that has a 'window' to adjust and I do not want my splash screen to have a visible window.
Is this splash screen displayed on application startup, if so you may want to look at the java SplashScreen class java.awt.SplashScreen. The splash screen displays at application startup before the JVM loads so it is displayed with virtually no time lag. You specify the image to display in it which can later be changed by your application to an image sized to the screen size. The API docs for the class tell you how to use it.
Alternatively you can have your application display the image in an undecorated window ie no borders or title area so it will fill the screen.