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Making a program with a menu bar containing colors which can be selected to change the color of the window. With java 15, the performance was improved with the addition of the javautilconcurrent package, including lock free implementations of the concurrentmaps and other multi-core collections, and it was improved further with java 16. Eclipse and java: using the debugger this tutorial is designed to teach java programmers how to use the eclipse java debugger if you have completed the total beginners tutorial or have some basic familiarity with eclipse and java, then this tutorial is for you. Java swing gui tutorial these notes are based on the excellent book, core java, vol 1 by horstmann and cornell, chapter 7, graphics programming.