Shephertz Technologies Senior Android Developer Interview Questions and Answers

I am a software developer with a passion for coding and problem-solving. My family is supportive and has always encouraged my career in tech.

• Experienced software developer

• Passionate about coding and problem-solving

• Supportive family that encourages my career in tech

staticmethod and class method are two types of methods in Python classes.

• staticmethod is a method that belongs to a class but does not have access to the class or instance.

• classmethod is a method that belongs to a class and has access to the class but not the instance.

• staticmethod is used when a method does not need to access the class or instance.

• classmethod is used when a method needs to access the class but not the ...read more

Sorting in a dictionary

• Use sorted() function to sort the dictionary by keys or values

• Use lambda function to sort the dictionary by custom key

• Use OrderedDict() to maintain the order of the sorted dictionary

I have used 'django.db.models' package in my Django models.

• The 'django.db.models' package provides the base classes for defining models in Django.

• It includes classes like 'Model', 'CharField', 'IntegerField', 'ForeignKey', etc.

• These classes are used to define the fields and relationships in a Django model.

• For example, 'class MyModel(models.Model): name = models.CharField(max_length=50)'

• This creates a model with a 'name...read more

Multithreading is the ability of a program to perform multiple tasks concurrently.

• Multithreading allows for better utilization of CPU resources

• It can improve program performance and responsiveness

• Examples include running multiple downloads simultaneously or updating a GUI while performing a background task

• Synchronization is important to prevent race conditions and ensure thread safety

Multithreading in Java allows concurrent execution of multiple threads.

• Java provides built-in support for multithreading through the java.lang.Thread class.

• Threads can be created by extending the Thread class or implementing the Runnable interface.

• The start() method is used to start a new thread, which calls the run() method.

• Synchronization mechanisms like synchronized blocks and locks can be used to control access to ...read more

No, Java does not support multiple inheritance. However, interfaces can inherit multiple interfaces.

• Java does not allow a class to inherit from multiple classes.

• This is because multiple inheritance can lead to ambiguity and conflicts.

• However, a class can implement multiple interfaces in Java.

• An interface can extend multiple interfaces, allowing for inheritance of multiple interfaces.

• This is known as interface inheritan

DO-WHILE loop executes the code block at least once, while WHILE loop executes only if the condition is true.

• DO-WHILE loop checks the condition at the end of the loop

• WHILE loop checks the condition at the beginning of the loop

• DO-WHILE loop executes the code block at least once

• WHILE loop may not execute the code block at all if the condition is false

I would rate myself as an 8 on a scale of 1-10.

• I have a strong understanding of software development principles and practices.

• I have experience working with multiple programming languages and frameworks.

• I am skilled in problem-solving and debugging.

• I have successfully delivered complex software projects in the past.

• I continuously strive to learn and improve my skills.

Display data of two tables by joining them using a common column.

• Use SQL JOIN statement to combine data from two tables based on a common column.

• Choose the appropriate type of JOIN based on the relationship between the tables.

• Specify the columns to be displayed in the SELECT statement.

• Use aliases to differentiate between columns with the same name in both tables.

• Apply any necessary filters or sorting to the result set.

Multithreading is the ability of a program to perform multiple tasks concurrently.

• Multithreading allows for better utilization of CPU resources

• It can improve program performance and responsiveness

• Examples include running multiple downloads simultaneously or updating a GUI while performing a background task

• Synchronization is important to prevent race conditions and ensure thread safety

Java supports multithreading through the java.lang.Thread class and java.util.concurrent package.

• Java threads are created by extending the Thread class or implementing the Runnable interface.

• Threads can be started using the start() method.

• Synchronization can be achieved using synchronized keyword or locks.

• Java provides several classes and interfaces to support concurrent programming such as Executor, ExecutorService, F...read more

Java does not support multiple inheritance, but interfaces can inherit multiple interfaces.

• Java does not allow a class to inherit from multiple classes, but it can implement multiple interfaces.

• Interfaces can inherit from multiple interfaces using the 'extends' keyword.

• For example, interface C can extend interfaces A and B: 'interface C extends A, B {}'

Do-While loop executes the code block once before checking the condition, while loop checks the condition first.

• Do-While loop is used when the code block needs to be executed at least once.

• While loop is used when the code block may not need to be executed at all.

• Do-While loop is less efficient than While loop as it always executes the code block at least once.

• Example of Do-While loop: do { //code block } while (conditi...read more

Join the tables on a common column and display the combined data.

• Identify the common column in both tables

• Use JOIN statement to combine the tables

• Select the columns to display

• Apply any necessary filters or sorting

• Display the data in a table or list format

Primary key uniquely identifies a record in a table, while unique key ensures uniqueness of a column.

• Primary key cannot have null values, while unique key can have one null value.

• A table can have only one primary key, but multiple unique keys.

• Primary key is used as a foreign key in other tables, while unique key is not.

• Example: Employee ID can be a primary key, while email address can be a unique key.

I have a strong background in software development, excellent problem-solving skills, and a passion for learning new technologies.

• Extensive experience in programming languages such as Java, Python, and C++

• Proven track record of delivering high-quality software solutions on time and within budget

• Strong analytical and problem-solving skills, with the ability to quickly adapt to new technologies and frameworks

• Excellent co...read more