The document is an agenda for Java and JEE training review sessions, covering typical interview preparation, Java access modifiers, and collections concepts like lists and sets. It details various coding scenarios, including autoboxing, method overriding vs. overloading, and common Java errors. The topics to be covered in the next session include maps and their functionalities.

1. Java & JEE Training
Review Sessions

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Agenda
• How to prepare for a typical Java interview?
• Typical interview questions…

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Explain the different access modifiers..
• Public
• Private
• Default
• Protected

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Code output?

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Code output?
c. Autoboxing will convert a short to a Short, but not to an Integer.

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Code output?

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Code output?
a. "j" will be converted to an Integer automatically when it is
passed to compareTo().

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Code output?

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Code output?
d. "i" will not be converted to an Integer automatically
because there is no assignment nor casting there.

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What is the output?

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What is the output?
It will print “a”. The g() in Bar is not overriding the g() in Foo. It is just overloading the name
"g". When determining which method to call, autoboxing is not considered first so only the
g() in Foo is applicable and thus is used.

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True or False
“X extends Y” is correct if and only if X is a class and Y is an interface.

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True or False
“X extends Y” is correct if and only if X is a class and Y is an interface.
False

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Question

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Question
B and D

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What is the output?

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What is the output?
Compilation error on lines that print f.a and f.b

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Which of these is not correct?

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Which of these is not correct?
All are correct

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What is the output?

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What is the output?
Compilation error… cannot invoke countGold from
static context

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What is the difference between a List and a
Set?
Set:
HashSet: Default Set …must implement equals and hashCode
LinkedHashSet: Maintains the elements in the order in which they were
entered
TreeSet: Maintains in ascending order/sorted
TreeSet<Student> ts = new TreeSet<Student>();
Comparable: Default comparison logic…. Student implements Comparable…
override compareTo()
Comparator: Multiple Comparator classes by implementing Comparator and
overriding compare()

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What is the difference between a List and a
Set?
• List, by default characteristic maintains order; a set does not.
• A set does not entertain duplicate members; whereas a List does

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Topics to be covered in next session
• Collections – Maps
• Map Interface
• Map methods
• Map views
• Map.Entry
• HashMap and TreeMap
• HashMap
• HashMap Constructors
• HashMap Methods
• Utilities

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Thank you!