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Q:

Which of the following statements are equal for a variable declared in the interface ?

1. int X=10
2. public int X=10
3. public static final int X=10

A) Only 1 and 2 are equal B) Only 2 and 3 are equal
C) All are unequal D) All are equal

Answer:   D) All are equal



Explanation:

All the statements are equal because inside an interface a variable declared will be public static final by default 

Subject: Java
Job Role: IT Trainer
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If you are using C language to implement the heterogeneous linked list, what pointer type will you use?

Answer

The heterogeneous linked list contains different data types in its nodes and we need a link, pointer to connect them. It is not possible to use ordinary pointers for this. So we go for void pointer. Void pointer is capable of storing pointer to any type as it is a generic pointer type.

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Which of the following modifiers can be used with Local inner class?

A) Final or Abstract B) Final or Transcient
C) Abstract or Transcient D) Final or public
 
Answer & Explanation Answer: A) Final or Abstract

Explanation:

It can either be Final or Abstract

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A lock can be acquired on a class.

The above statement is

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Answer & Explanation Answer: A) True

Explanation:

A lock can be acquired on a class. This lock is acquired on the class's Class object.

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Convert the expression ((A + B) * C – (D – E) ^ (F + G)) to equivalent  Postfix notations.

A) AC + B * DE - FG +^- B) AB + C * DE - FG + ^-
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What are the various elements of OOPS?

Answer

Various elements of OOP are:


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Subject: Java

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Q:

try { int x = Integer.parseInt("two"); }

Which could be used to create an appropriate catch block?

A) ClassCastException B) IllegalStateException
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Answer & Explanation Answer: C) NumberFormatException

Explanation:

C is correct. 'Integer.parseInt' can throw a NumberFormatException, and IllegalArgumentException is its superclass 

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Q:

class Hell {

public static void main(String[] args) {

Integer i = 42;

String s = (i<40)?"life":(i>50)?"base":"ball";

System.out.println(s);

}

}

A) null B) ball
C) base D) None
 
Answer & Explanation Answer: B) ball

Explanation:

D is correct. This is a ternary nested in a ternary with a little unboxing thrown in.Both of the ternary expressions are false.

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1 31908
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Which method names follow the JavaBeans standard?

A) addSize B) putDimensions
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Answer & Explanation Answer: C) getCust

Explanation:

C use the valid prefixes 'get' and 'is

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