Ezeiatech Systems Interview Questions and Answers

Q1. Tell me about yourself?
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Q2. Number of projects done, recent projects and what was the part developed by you?
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Q3. HashMap vs Linked HashMap
Ans. 
HashMap is unordered while LinkedHashMap maintains insertion order.
• HashMap provides faster access and retrieval of elements while LinkedHashMap maintains the order of insertion.

• LinkedHashMap is useful when we need to maintain the order of insertion of elements.

• HashMap is preferred when order is not important and faster access is required.

• Example: HashMap is used in caching while LinkedHashMap is used in LRU cache imple...read more
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Q4. What is ForeGround services, how to implement them
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Foreground services are services that have a higher priority and are visible to the user.
• Foreground services are used to perform tasks that are noticeable to the user, such as playing music or downloading files.

• They require a notification to be displayed to the user, indicating that the service is running.

• To implement a foreground service, you need to create a service class and call startForeground() method in it.

• You a...read more
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Q5. DS question input string : "I love coding, coding is life" output : [I = 1, love = 1, coding = 2, is = 1, life = 1]
Ans. 
Count the frequency of each word in a given string and return the result as a key-value pair.
• Split the string into words using space as a delimiter.

• Use a HashMap or dictionary to store the word counts.

• Iterate through the list of words and update their counts.

• Example: For 'I love coding', the output would be {I: 1, love: 1, coding: 1}.
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Q6. What is intent services? Intent service vs service
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Intent Service is a subclass of Service that performs a single operation on a separate thread.
• Intent Service is used for long-running operations that do not require user interaction.

• It is started with an Intent and runs on a separate thread.

• It stops itself automatically when the operation is complete.

• It can be used for tasks like downloading a file or uploading data to a server.

• Intent Service is useful for performing b...read more
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Q7. Can a final class in java be inherited
Ans. 
No, a final class in Java cannot be inherited.
• Final classes are those classes which cannot be extended or inherited.

• If a class is declared as final, it means that it cannot be subclassed.

• Final classes are used to prevent modification of a class's implementation.

• Final classes are also used to improve performance and security.

• For example, the String class in Java is a final class and cannot be inherited.
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Q8. Differences between MVP and MVVM
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MVP and MVVM are architectural patterns used in software development for separating concerns and improving maintainability.
• MVP stands for Model-View-Presenter and is a pattern where the presenter acts as a mediator between the view and the model.

• MVVM stands for Model-View-ViewModel and is a pattern where the view model acts as a mediator between the view and the model.

• In MVP, the view is responsible for updating the pr...read more
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Q9. Activity lifecycle, Fragment lifecycle, sequence of override method called when back button is pressed on a fragment.
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Q10. How to set bitrate in ExoPlayer
Ans. 
Bitrate can be set using DefaultTrackSelector in ExoPlayer
• Create a DefaultTrackSelector instance

• Create a TrackSelection.Factory instance

• Set the bitrate using the factory

• Set the track selector to the player
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Q1. Reverse string but keep the whitespaces seen on the original string.
Ans. 
Reverse a string while preserving the original whitespaces.
• Iterate through the string character by character.

• If the character is a whitespace, add it to the result string.

• If the character is not a whitespace, prepend it to the result string.

• Return the reversed string with preserved whitespaces.
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1 sql question was given , interviewer has bad internet , he was leaving and joining multiple times.

Q1. Difference between wait() , notify() and notifyAll()
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Q2. Bean life cycle
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