Previous-year question practice database
Answer
Exam answer
java.util and java.io. (java.lang and java.awt are equally acceptable.)
Explanation
The four worth knowing, with what each holds: java.lang - String, Math, the wrapper classes; imported automatically java.util - Scanner, Date and the collection classes java.io - the input and output stream classes java.awt - classes for graphics and windowing Naming what a package contains alongside its name costs one line and shows real knowledge rather than recall.
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