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 Java Questions

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Q:

Can you give few examples of final classes defined in Java API?

Answer

java.lang.String,  java.lang.Math are final classes.

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Subject: Java - Technology

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Q:

Should a main() method be compulsorily declared in all java classes?

Answer No not required. main() method should be defined only if the source class is a java application.
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Q:

I want to print "Hello" even before main() is executed. How will you acheive that?

Answer Print the statement inside a static block of code. Static blocks get executed when the class gets loaded into the memory and even before the creation of an object. Hence it will be executed before the main() method. And it will be executed only once.
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Q:

Exception handling is targeted at

A) Compile time error B) Logical error
C) Run time error D) All of the above
 
Answer & Explanation Answer: C) Run time error

Explanation:
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Q:

Which of the following are incorrect form of StringBuffer class constructor  ?

A) StringBuffer(int size , String str) B) StringBuffer(int size)
C) StringBuffer(String str) D) StringBuffer()
 
Answer & Explanation Answer: A) StringBuffer(int size , String str)

Explanation:
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Q:

What are the restriction imposed on a static method or a static block of code?

Answer A static method should not refer to instance variables without creating an instance and cannot use "this" operator to refer the instance.
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Subject: Java - Technology

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Q:

Which of the following statements about inheritance is false?

A) Inheritance allows you to minimize the amount of duplicate code in an application by sharing common code among several subclasses. B) A subclass inherits all the members (fields, methods, and nested classes) from its superclass.
C) Through inheritance, a parent class is a more specialized form of the child class. D) Inheritance allows you to reuse the fields and methods of the super class without having to write them yourself.
 
Answer & Explanation Answer: C) Through inheritance, a parent class is a more specialized form of the child class.

Explanation:
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Q:

Which is true?

A) "X extends Y" is correct if and only if X is a class and Y is an interface B) "X extends Y" is correct if and only if X is a class and Y is an interface
C) "X extends Y" is correct if X and Y are either both classes or both interfaces D) "X extends Y" is correct for all combinations of X and Y being classes and/or interfaces
 
Answer & Explanation Answer: C) "X extends Y" is correct if X and Y are either both classes or both interfaces

Explanation:

A is incorrect because classes implement interfaces, they don't extend them. B is incorrect because interfaces only "inherit from" other interfaces. D is incorrect based on the preceding rules.

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