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Core Java - Interview Questions and Answers for 'Keyword' - 45 question(s) found - Order By Rating

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 Q1. What is the Main Advantage of the native Key Word?Core Java2018-11-14 12:46:51

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 Q2. Can we declare an Interface with abstract keyword ? Core Java2018-07-20 18:20:27

Ans. Yes

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 Q3. Are final methods faster than regular instance methods ?Core Java2018-07-16 06:53:39

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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 Q4. Why Java has final class ?Core Java2018-07-10 12:24:27

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 Q5. How different is it when final applied to variables and object references ? Core Java2017-07-29 13:31:59

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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 Q6. When we say final x = 10, is the reference final or the value ?Core Java2017-07-29 13:27:04

Ans. final keyword have meaning only to referenced and not the value. It means that the specified reference cannot be dereferenced. It doesn't control the value assigned to the memory that's being referenced. This is the reason that final object references doesn't mean that the object is immutable but means that the reference cannot be changed to point to new object.

In case of primitive types too, when we assign a reference to another, values are passed and not the object reference, and hence a new placeholder is created in memory with the same value. That is why final to that context means that you cannot change the assigned memory and there is no way we can have that memory place have another value.

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 Q7. What is the use of final keyword ?Core Java2017-06-08 06:17:54

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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 Q8. Which are the reserved words in Java ?Core Java2017-05-31 16:52:35

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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 Q9. Why is goto not used in Java?Core Java2017-05-05 21:43:16

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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   Like         Discuss         Correct / Improve     goto  keywords


 Q10. What is the difference between keywords, identifiers and literals in java ?Core Java2017-04-30 09:45:27

Ans. Keywords are the reserved words that have a pre defined meaning for the compiler and hence are restricted to be used as identifiers.

Identifiers are the name assigned to different programming constructs like classes, interfaces, methods , variables etc.

Literals are the values that are assigned to Identifiers.

For example

int count = 0;

in the above statement "int" is a keyword, "count" is an identifier and "0" is a literal

  Sample Code for keywords

  Sample Code for identifiers

  Sample Code for literals

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 Q11. Can we use true and false as identifiers in java ? Are they keywords in Java ?Core Java2017-04-30 09:40:17

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

  Sample Code for literal

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 Q12. Can we use java keywords as identifiers ?Core Java2017-04-26 20:02:06

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

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 Q13. What is a difference between Identifier and keyword ?Core Java2017-04-26 20:01:21

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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 Q14. Which of the following applies to "private"?

It is a keyword
It is a modifier
It is an access modifier
Core Java2017-04-26 19:57:30

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

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 Q15. Which of the following applies to Final ?

It is a keyword
It is a modifier
It is an access modifier
Core Java2017-04-26 19:56:51

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

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 Q16. What is the difference between a keyword and a modifier ?Core Java2017-04-26 19:55:30

Ans. Keywords are the reserved words that have a pre defined meaning for a compiler whereas modifiers are the type of keywords that modifies the state or definition of a programming construct.

for, while are keywords but not modifiers.
private , public , final , abstract etc are keywords as well as modifiers.

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 Q17. Is exit a keyword in Java ?Core Java2017-01-12 11:21:28

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

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   Like         Discuss         Correct / Improve     exit  keywords  exit a program     Asked in 1 Companies


 Q18. Is delete a keyword in Java ?Core Java2017-01-12 11:20:42

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

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 Q19. What is the use of static keyword in Java ?Core Java2017-01-09 13:32:24

Ans. static keyword is used to specify that the respective programming construct ( method , variable ) belongs to the class and not to its instance and is supposed to be shared by all instances of the class.

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   Like         Discuss         Correct / Improve     static keyword     Asked in 1 Companies      basic        frequent


 Q20. Name some of the Java Keywords ?Core Java2017-01-07 16:54:09

Ans. Static , Final , Synchronized, private , public , protected, volatile, transient, super, this,import , abstract,native,default (effective java 8), new

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 Q21. Is New Keyword a method Name ?Core Java2016-06-12 20:15:01

Ans. No, Its an Operator.

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 Q22. Does compiler treats it differently if we don't prefix this to the member element and its implicit as its the only variable available with that name ?2016-05-29 10:18:38

Ans. It makes no difference whether we add this to the variable or not. The only use of this is in the cases where there are multiple variables with the same name and we want to distinguish between the member variable and local variable. In case this is not added ,this is automatically added by the compiler in the byte code.

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Frequently asked question for intermediate developers. Frequently asked in HCL Technologies and EPAM.
  Q23. What is Volatile keyword used for ?Core Java
Anonymous
Ans. Volatile is a declaration that a variable can be accessed by multiple threads and hence shouldnt be cached.

  Sample Code for volatile

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  Q24. What is the use of Transient Keyword ?Core Java
Anonymous
Ans. It in Java is used to indicate that a field should not be serialized.

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 Q25. What is a Final Method ?Core Java
Anonymous
Ans. A Method that cannot be overriden in the sub class.

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Very Frequently asked.Favorite question in Walk in drive for many Indian service companies.
 Q26. What is a Final Class ?
Anonymous
Ans. A Class that cannot be sub classed.

  Sample Code for final class

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 Q27. Can we override static methods ? Why ?Core Java
Anonymous
Ans. No.

Static methods belong to the class and not the objects. They belong to the class and hence doesn't fit properly for the polymorphic behavior.

A static method is not associated with any instance of a class so the concept of overriding for runtime polymorphism using static methods is not applicable.

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 Q28. Can we access instance variables within static methods ?Core Java
Anonymous
Ans. Yes.we cannot access them directly but we can access them using object reference.Static methods belong to a class and not objects whereas non static members are tied to an instance. Accessing instance variables without the instance handler would mean an ambiguity regarding which instance the method is referring to and hence its prohibited.

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 Q29. Explain the use of "Native" keyword ?Core Java
Anonymous
Ans. Used in method declarations to specify that the method is not implemented in the same Java source file, but rather in another language

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 Q30. What is "super" used for ?
Anonymous
Ans. Used to access members of the base class.

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