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I/O preparation for SCJP 2 exam (help)

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I am going to prepare I/o for Java 2 exam. What is need to prepare.
1. Do I need to prepare I/O for exam although it is not in objectives
2. Do I need to remember the hierarcy for streams and character based classes
3. Do i need to remember the constructor for all classes
4. What methods i need to remember if any?
4. What portion of package i need to prepare for the exam.
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Yes, book up on I/O.
Yes, know the hierarchy.
You should have basic knowledge of the methods and thorough knowledge of the constructors.
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