<PLEASE USE THE FOLLOWING TEMPLATE TO HELP YOU CREATE A GREAT POST!>
<Below this line, add a link to the EXACT exercise that you are stuck at.>
<In what way does your code behave incorrectly? Include ALL error messages.>
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With a google search you find several discussions
== discussions / opinions ==
java what is an instance site:stackoverflow.com
Or you can read the official Book
== the Book ==
java what is an instance site:oracle.com
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