Core java interview Questions You'll Most Likely Be Asked (Second Edition)

Scenario Based Ques ons
Suppose you create a new thread by extending the Thread
class and you invoke the start method multiple times. What do
you think will happen?
Suppose you have a method that returns an integer value. The
code is present within a try/catch/finally. There is a return
statement in the try, catch and finally blocks. The return
statement in the try block returns 1, the return statement in the
catch block returns–1 and the return statement in the finally

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block returns 0. If an exception occurs, which value will be
returned?
Suppose you have a static method in the Base class. And
suppose you have a method with the same name in the sub–
class. And suppose you create a Base class object and assign
it a reference of the sub–class object and invoke the static
method. Is this valid? If so, which version of the static method
gets invoked?
Suppose you have a method in a base class that throws an
ArrayIndexOutOfBoundsException. And suppose this method
is overridden in the sub–class and declares that it throws a
RuntimeException. What do you think will happen?
Suppose you have a List of objects. You want to send it as a
parameter to a client application but want to ensure that the
client application does not make changes to it. How can you
achieve this?
Suppose you are reading 10000 String values from the
database. You need to create a concatenated String with
these values. Which is the most efficient way to achieve this?
Suppose you are developing an application that performs a lot
of mathematical calculations involving very large decimal
numbers. Which data type will you use for your variables given
that precision is important?
Suppose you are working on a multi–threaded application. A
new requirement comes in where you need to store key–value
pairs. Which is the most appropriate Collection to be used in
such a scenario?
Suppose you need to create some utility methods in your
application. What is the best practice for creating such
methods? Where would you place them?
Suppose you have developed an interface called FileWriter as