Developers & Programmers Interview

Interview Question:

Can you explain the difference between an abstract class and an interface in Java?

Candidate's Answer:

First class where abstract class is defined with using abstract keyword and interface is.Defined with.In.Interface keyword and abstract class contains abstract abstract methods and non abstract methods where interface doesn't have.Non abstract methods it won't. It contains only abstract methods, only and.Of circulars does not support multiple interface interface.Multiple inheritance where interface can.Ohh.Accepts.Multiple inheritance.

Evaluation:

Your answer has the basic concepts of abstract class and interface in Java, but it could be improved by providing more clarity and depth to your explanation.

An abstract class in Java is a class that cannot be instantiated on its own and may contain abstract methods, which are methods without a body that must be implemented by any concrete subclass. Abstract classes can also have non-abstract methods with a body, allowing for common functionality to be shared among subclasses.

On the other hand, an interface in Java is like a contract that defines a set of methods that a class must implement. Interfaces cannot have method implementations, only method signatures. A class can implement multiple interfaces, allowing for greater flexibility in reusing code.

To improve your answer, you could mention that a class can extend only one abstract class, while it can implement multiple interfaces. You could also provide examples or scenarios where each concept is commonly used in Java programming.

Overall, your answer is a good starting point but could benefit from more detail and examples to fully explain the differences between abstract classes and interfaces in Java.

Rating: 3/5

Interview Question:

How do you handle exceptions in Java? Can you give an example of a checked and unchecked exception?

Candidate's Answer:

In Java, usually we use try catch blocks to handle exceptions.Check.Exceptions is.A type of exception handling.Which can be handled at compile time and unchecked exceptions are handled at runtime.Exception handling.Such as?Dividing by zero XC and unchecked exceptions are memory out of bound, etc.

Evaluation:

Your answer is somewhat correct but it could be improved with more detail and examples.

In Java, exceptions are used to handle errors that occur during the execution of a program. There are two types of exceptions in Java - checked and unchecked.

Checked exceptions are exceptions that are checked at compile time. This means that the compiler ensures that these exceptions are caught or declared by the programmer. Examples of checked exceptions include IOException, SQLException, and ClassNotFoundException.

Unchecked exceptions, on the other hand, are exceptions that are not checked at compile time. These exceptions occur at runtime and are not required to be caught or declared. Examples of unchecked exceptions include NullPointerException, ArrayIndexOutOfBoundsException, and ArithmeticException (such as dividing by zero).

To handle exceptions in Java, you can use the try-catch blocks. The try block contains the code that may throw an exception, and the catch block handles the exception if it occurs. You can also use the finally block to execute code regardless of whether an exception is thrown.

To improve your answer, you can include more examples of both checked and unchecked exceptions, and provide a more detailed explanation of how try-catch blocks work in exception handling in Java.

Overall, I would rate your answer 3/5. It provides a basic understanding of exception handling in Java but could benefit from more detail and examples.