Part 3
Interview questions on inner classes in java for experienced covered in this post:
How many .class files will be created if there are 2 inner classes inside outer class?
-
Total 3 .class files will be generated after successfully
compiled a class which has two inner classes.
Can we access all members of outer class including private in inner class?
-
Yes, we can access all members including private members of
the outer class in the inner class.
 
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Can you declare local inner class as a static class?
-
No, we cannot declare local an inner class as a static
class.
Anonymous class means name without a class then how will you create an object without using name?
-
Please refer to the below example.
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package simplifiedjava.crackedInterview;
public
class
AnonymousClass {
public
void
eat() {
System.out.println("Ear First Time.");
}
}
package
simplifiedjava.crackedInterview; public class AnnonymousInnerClassDemo { public static void main(String[] args) {
AnonymousClass anonymous
= new
AnonymousClass() {
public
void
eat() {
System.out.println("Second Time");
}
};
anonymous.eat();
}
}
Output: Second Time
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Can we declare local inner class with Public, Private and Protected?
-
No. Public, Private and Protected are not applicable to local
inner class.
-
Only final, abstract and strictfp are applicable to local
inner class.
Can you declare class inside class?
-
Without existing one type of object if there is no chance of
existing another type of object then we can declare a class inside a
class.
-
E.g. University can have several departments, without
existing university there is no chance of an existing departments. Hence, we
have to declare department class inside university class.
-
Please refer to the below example.
|
package simplifiedjava.crackedInterview;
public
class
University { public class Department{
}
} |
Can you declare interface inside interface?
-
Yes, we can declare interface inside interface.
-
We can take the example of Map. A map is a group of key/value
pairs.
-
Each key/value pair is called Entry.
-
Without an existing map object, there is no chance to exist
an Entry object. Hence, interface Entry is defined inside Map.
-
Please refer to the below example.
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public interface Map <K,V> { public interface Entry<K,V>{
}
} |
Can you declare interface inside class?
-
Inside a class, if we require multiple implementations of an
interface and all these implementations are related to the class then we can
define an interface inside a class.
-
Please refer to the below Example.
|
package simplifiedjava.crackedInterview; public class InterfaceDefinedInsideClassDemo {
interface
Vehicle{
public
void
getNoOfWheels(); }
class
Bus implements
Vehicle{
public
void
getNoOfWheels() {
System.out.println("Six Wheels");
} }
class
Pulsor implements
Vehicle{
public
void
getNoOfWheels() {
System.out.println("Two Wheeler");
} }
public
static
void
main(String[] args) {
InterfaceDefinedInsideClassDemo demo
= new
InterfaceDefinedInsideClassDemo();
Vehicle v
= demo.new
Bus(); v.getNoOfWheels();
v
= demo.new
Pulsor();
v.getNoOfWheels();
}
}
Output:
Six Wheels
Two Wheeler |
Can you declare class inside interface?
-
If the functionality of the class is closely associated with
the interface then it is highly recommended to declare a class inside the
interface.
-
Please refer to the below example.
|
package simplifiedjava.crackedInterview; public interface EmailService { public void sendEmail(EmailDetails e);
class
EmailDetails{
String toList;
String ccList;
String subject;
String body;
}
} |
- Java interview questions and answers all MNC - Click here
- Basic core java interview questions and answers for freshers - Click here
- Core java interview questions for 3 years experience - Click here
- Core java interview questions and answers for 3-5 years exp - Click here
- Core java interview questions and Answers for 5 - 7 Years exp - Click here
- Basic Java Interview Questions and Answers - Click here
- Java interview questions and answers on oops - Click here
- Java interview questions and answers on Strings - Click here
- Java interview questions on exception handling - Click here
- Interview questions on multithreading in java for experienced - Click here
- Interview questions on serialization in java for experienced - Click here
- Interview questions on inner class in java for experienced - Click here
- Interview questions on Collections in java for experienced - Click here
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Thank you techies for visiting this blog. I hope you enjoyed this blog and got more technical knowledge. I have tried to cover all types of questions and provided examples tested on eclipse as much as I can. Guys, please don’t just mug up the questions and answers. Try to clear your concepts with examples. Try to write a code on eclipse once you read the concepts. It will help you to memorize the concepts for a very long time. Simultaneously you will be prepared for interview programs as well. It will help you to survive in the IT sector for a long time. It may be easy to crack an interview but it's really tough to survive in the IT industry with inadequate knowledge and skills. I have collected all the questions from actual interviews attended by my friends, colleagues, college mate and classmate. I have covered frequently asked questions as well as challenging questions. I have included many programs to understand the concept thoroughly. I will try to explain the concept with the help of a real-time program in eclipse. You can share more questions which are not covered in this blog or post. Always welcome your suggestions and queries. I will definitely try to resolve it. Please comment your queries and new set of questions under the comment sections. I will create a new post for those questions.
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