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Interface and Abstract

 
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this part is one of my weaknesses...anybody can give me tips on how can i improve my understanding of these topics (URLs, study guides, etc...) thanks in advance!
 
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I read Thinking in Java by Bruce Eckel and wrote lots of small pieces of code.
 
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Please check out the following discussions about differences between interface anbd abstract classes:
https://coderanch.com/t/238777/java-programmer-SCJP/certification/difference-between-interface-abstract-classes
 
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