Entrata Senior Software Engineer Interview Questions and Answers

Q1. 1) OOP Concepts
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Q2. Difference between Abstract class and interface
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Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, fields, and methods, while interface cannot have any of these.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Abstract classes are used to provide a common base for multiple classes, while interfaces are used to define a contract for ...read more
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Q3. Mysql Concepts and Mysql queries
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Q4. Logical questions on Array and String Functions in PHP
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Q5. File handling functions such as fread, fopen, fclose etc and logical string function questions on file data.
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Q1. All Scenario based questions
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Q2. OOP Concepts in deep
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OOP Concepts refer to the principles of Object-Oriented Programming, including encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (object).

• Inheritance: Allowing a class to inherit properties and behavior from another class.

• Polymorphism: The ability for objects of different classes to respond to the same message in different ways...read more
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Q3. Software design pattern related questions
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Q4. Small Logical programs
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Q5. Database queries in deep
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Database queries involve retrieving, updating, and manipulating data stored in a database.
• Database queries are used to retrieve specific data from a database based on certain criteria.

• Queries can also be used to update existing data or insert new data into the database.

• SQL (Structured Query Language) is commonly used to write database queries.

• Examples of database queries include SELECT, INSERT, UPDATE, and DELETE state...read more
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Q1. What final class and method
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The final class and method are used to prevent inheritance and method overriding respectively.
• Final class: A final class cannot be subclassed. It is often used for utility classes or classes that should not be extended.

• Final method: A final method cannot be overridden by subclasses. It is used to prevent modification of a method's behavior in subclasses.
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Q2. PHP reference variable
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PHP reference variables allow multiple variables to point to the same data, enabling efficient memory usage and data manipulation.
• Reference variables are created using the '&' operator. Example: $a = 10; $b = &$a; // $b now references $a.

• Changes to a reference variable affect the original variable. Example: $b = 20; // Now $a is also 20.

• References can be used with functions to modify arguments directly. Example...read more
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Q3. Find duplicate numbers
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Find duplicate numbers in an array of strings.
• Iterate through the array and keep track of the count of each number using a hash map.

• If the count of a number is greater than 1, it is a duplicate.

• Return the list of duplicate numbers.
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Q4. Echo variable in single quote what will be output
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The output will be the literal string of the variable, without any variable interpolation.
• When a variable is echoed in single quotes, it is treated as a literal string.

• No variable interpolation or special characters are interpreted.

• The output will include the variable name itself, not its value.
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Q5. What is oops concept
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Object-oriented programming (OOP) is a programming paradigm that uses objects to represent and manipulate data.
• OOP is based on the concept of classes and objects.

• It focuses on encapsulation, inheritance, and polymorphism.

• Encapsulation hides the internal details of an object and provides a public interface.

• Inheritance allows classes to inherit properties and methods from other classes.

• Polymorphism allows objects of diff...read more
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Q6. Having clause in MySQL
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The HAVING clause is used in MySQL to filter the results of a GROUP BY query based on a condition.
• The HAVING clause is similar to the WHERE clause, but it operates on grouped rows rather than individual rows.

• It is used in conjunction with the GROUP BY clause.

• The HAVING clause is used to filter the results of a GROUP BY query based on a condition that applies to the grouped rows.

• It is typically used to specify condition...read more
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A company designed the test basically to understand the nature of the interviewee. Simple test.

Q1. OOP Questions like inheritance, polymorphism, etc.
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