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What are system classes?

 
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What do we exactly mean by "java system classes"? Are the classes in java.lang, java.util, java.io considered to be system classes? what about classes in the packages under javax directory?

[ Context : -esa and -dsa options of java ]
 
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I found a reference to the System classes being those comprising the Java Runtime Environment: those like Object, String, List et c.

ref: The Java Programming Language 4th Edition by Arnold, Gosling, Holmes.
 
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