Top 25 Interview Questions For Java – Crack Java Interview

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Earlier, we have discussed part 1 and part 2 of Interview questions for Java. Today, we are discussing advanced Interview Questions for Java. These Java Interview questions and answers will help you to boost up your confidence for upcoming Java Interview. Here, we are providing interview questions for Java freshers and experienced.

So, let’s start Interview Questions for Java Programming.

Mostly Asked Interview Questions for Java

Below, we are discussing some frequently asked Interview Questions for Java Programming Language:

Q.1 What’s the difference between Inner category and Nested classes?

A class becomes an inner class when a class is defined within the scope of another class and if the access modifier of the inner class is static, then it becomes a nested class.

Q.2 Can an abstract class be final?

An abstract class may not be declared as final.

Q.3 What’s Numeric promotion?

It is the conversion of a smaller numeric type to a larger numeric type, so integer and floating-point operations may happen. In this type, byte, char, and short values are converted to int values. The int values are converted to long values, if necessary. The long and float values are converted to double values, as needed.

Q.4 What’s the distinction between a public and a non-public class?

A public and non-public class in Java differ from one another by how accessible they are to other classes and programmes. A public class can be used, extended, or created by code from outside its own package since it is available from any other class or package.

On the other hand, a non-public class, sometimes referred to as a package-private or default class, may only be accessed or used by classes that are part of the same package. A class is automatically a non-public class when it is declared without any access modifiers.

The visibility and accessibility of classes, methods, and fields are governed by access modifiers like public, private, protected, and default. This enables Java to impose encapsulation and regulate access to different components.

Q.5 To what value could be a variable of the Boolean type automatically initialized?

The default value of the Boolean type is false.

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These are the best Java Interview Question, which can surely help you with your upcoming interviews.

Q.6 What’s the difference between the prefix and postfix forms of the ++ operator?

The prefix kind performs the increment operation and returns the worth of the increment operation. The affix kind returns this worth all of the expression then performs the increment operation thereon worth.

Q.7 What restrictions are placed on method Overriding?

Overridden methods should have a similar name, argument list, and return type. The overriding method might not limit the access of the method it overrides. The overriding method might not throw any exceptions which will not be thrown by the overridden methodology.

Q.8 What’s a Java package and the way is it used?

A Java package is a naming context for categories and interfaces. A package is employed to create a separate name space for groups of classes and interfaces.

Q.9 What modifiers could also be used with a top-level class?

A top-level class could also be public, abstract, or final.

Q.10 What’s the distinction between an if statement and a switch statement?

The if statement is employed to select among 2 alternatives. It uses a boolean expression to decide that variable should be executed. On the other hand, the switch statement is employed to select among multiple alternatives, it makes use of an int expression to determine that alternative should be executed.

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Q.11 Will a method be overloaded based on totally different return type but same argument type?

No, because the methods can be referred to as without using their return type in which case there’s ambiguity for the compiler.

Q.12 What Happens to a Static var that’s defined within a method of a class?

Can’t do it. You will get a compilation error

Q.13 How many Static Init can you have?

As many as you would like, however the static initializers {and class|and sophistication} variable initializers are executed in textual order and should not refer to class variables declared in the class whose declarations seem textually once the use, despite the fact that these class variables are in scope.

Q.14 What’s the distinction between method overriding And Overloading?

Overriding could be a method with the same name and arguments as in a parent, whereas overloading is that the same method name however different arguments.

Q.15 What’s constructor chaining and how is it achieved in Java?

Constructor chaining is achieved when a child object constructor always first must construct its parent (which successively calls its parent constructor.). In Java it’s done via an implicit call to the no-args.

Interview Questions for Java Freshers

Q.16 What’s the distinction between the Boolean & Operator and also the && Operator?

The & operator is applied to the operand when both the boolean and && operator is evaluated. Once an expression involving the && operator is evaluated, the first operand is evaluated. If the first operand returns a value of true then the second operand is evaluated. The && operator in Java is then applied to the first and second operands. If the first operand evaluates to false, the analysis of the second operand is skipped.

Q.17 Which Java Operator is correct associative?

The = operator is correct associative.

Q.18 Will a double value be cast to a byte?

Yes, a double value is often cast to a byte.

Q.19 What’s the distinction between a break statement and a continue statement?

A break statement results in the termination of the statement to that it applies (switch, for, do, or while) while on the other hand continue statement is used to end the current loop iteration and return control to the loop statement.

Q.20 Can a for statement loop indefinitely?

Yes, a for statement will loop indefinitely

Interview Questions for Java Experienced

Q.21 To what value is a variable of the string type automatically initialized?

The default value of a String type is null.

Q.22 What’s the distinction between a field variable and a local variable?

A field variable could be a variable that’s declared as a member of a class. a {local|an area|a neighborhood} variable could be a variable that’s declared local to a method.

Q.23 How are this() And super() Used with constructors?

this() is employed to invoke a constructor of a similar class. super() is used to invoke a superclass constructor.

Q.24 What will It mean that a class or member is final?

A final class can’t be inherited. A final method can’t be overridden in a subclass. The final field can’t be modified once it’s initialized, and it should include an initializer statement wherever it’s declared.

Q.25 What will it mean that a method or class is abstract?

An abstract class can’t be instantiated. Abstract methods could solely be included in abstract classes. However, an abstract class isn’t needed to have any abstract methods, although most of them do. Every subclass of an abstract class should override the abstract methods of its superclasses or it also ought to be declared abstract.

So, this is all best Interview Questions for Java. Hope you liked it.


Hence, you completed interview Questions for Java. Hope these interview questions for Java helped you to clear your Java concepts and prepare yourself for Java Interview. Still, if any doubt regarding Java interview Questions, ask in the comment tab.

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2 Responses

  1. Kranti says:

    Thanks for sharing the important and valuable java interview questions. This article will help me for the interviews preparation & many thanks for this list of questions. keep up the great work.

    • DataFlair Team says:

      Hi Kranti,
      We are happy that you like our Article on Interview Questions on Java, but it doesn’t end here you can refer our sidebar for more Java questions. Moreover, you can play our Java Quizzes for more Interview practice.

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