Core Java - Interview Questions and Answers for 'Keyword' | Search Interview Question

Interview Questions and Answers - Order By Newest

Q31. Is delete a keyword in Java ?

Core Java

Ans. No, delete is not a keyword in Java. Destruction of objects is taken care by Java Garbage Collection mechanism.

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Q32. Is exit a keyword in Java ?

Core Java

Ans. No exit is a method to exit execution of a program.

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Q33. Which of the following applies to Final ?

It is a keyword
It is a modifier
It is an access modifier

Core Java

Ans. It is a keyword and a modifier but not an access modifier.

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Q34. Which of the following applies to "private"?

It is a keyword
It is a modifier
It is an access modifier

Core Java

Ans. Yes, all of them applies to private keyword. It is an access modifier.

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Q35. What is a difference between Identifier and keyword ?

Core Java

Ans. Keyword is a reserved word that has a pre defined meaning for the compiler and hence cannot be used as an identifier, for example - final, private , for etc.

Identifier is the name given by the programmer to a programming construct, for example - class and method names etc.

java Keywords cannot be used as an identifier in java.

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Q36. Can we use java keywords as identifiers ?

Core Java

Ans. No, keyword has pre defined meaning for compiler and hence cannot be used as identifiers.

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Q37. Can we use true and false as identifiers in java ? Are they keywords in Java ?

Core Java

Ans. true and false are literals in java. No we cannot use them as identifiers.

Sample Code for literal

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Q38. Why is goto not used in Java?

Core Java

Ans. Goto statement results in unstructured jumps in control from one code location to another and hence makes the code very difficult
to read , maintain and debug. Moreover Goto can always be replaced using other statements like break / continue and hence results in structured movement of programming control.

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Q39. Which are the reserved words in Java ?

Core Java

Ans. All Keywords , modifiers ( public , static , final etc ) as well as non modifier keywords ( for, if,switch etc ) are reserved words in java and hence cannot be used as identifiers. Along with keywords , there are few literals that have predefined meaning and hence cannot be used as identifiers, these are true , false and null.

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Q40. What is the use of final keyword ?

Core Java

Ans. final keyword is a modifier that means differently when applied to variables, methods and classes.

1. Final variable cannot be changed once initialized
2. Final method cannot be overridden
3. Final class cannot be sub classed

Sample Code for final variable

Sample Code for final method

Sample Code for final class

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Q41. How different is it when final applied to variables and object references ?

Core Java

Ans. final when assigned to object references doesn't make them immutable. It means that the references cannot be de-referenced.

final when applied to variables means that the value cannot be changed.

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Q42. Why Java has final class ?

Core Java

^{This question was recently asked at 'Avis'.This question is still unanswered. Can you please provide an answer.}

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Q43. Are final methods faster than regular instance methods ?

Core Java

Ans. Yes. As they cannot be overridden , there is no use of virtual table concept which is used for dynamic binding resolution.

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Q44. Can we declare an Interface with abstract keyword ?

Core Java

Ans. Yes

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Q45. What is the Main Advantage of the native Key Word?

Core Java

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Q46. What will be the output of following code ?

public class BuggyBread {

   private int x;

   private BuggyBread(int x){
      x = x;
   };

   public static void main(String[] args){
      BuggyBread buggybread = new BuggyBread(5);
      System.out.println(buggybread.x);
   }
}

Core Java

a. compilation error