when you specify height for JFrame the title bar consumes a part of this height, is there a method or something to know the amount of this consumed part ?
JFrame has a method called
From the Javadoc:
getInsets public Insets getInsets() Determines the insets of this container, which indicate the size of the container's border. A Frame object, for example, has a top inset that corresponds to the height of the frame's title bar.