CatalystOne Solutions Software Engineer Trainee Interview Questions and Answers

Q1. About company values
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Q1. UML class diagram
Ans. 
UML class diagram is a visual representation of classes, attributes, methods, and relationships in a system.
• Classes are represented as boxes with three compartments for class name, attributes, and methods.

• Attributes are listed in the second compartment with their data types.

• Methods are listed in the third compartment with their parameters and return types.

• Relationships between classes are shown using lines with arrows ...read more
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Competency based questions

Know your resume and your basics

Know class diagrams. Very Huge for workday.

The level of test was mixture of easy and tough questions

Q1. Some analytics questions related to problem solving
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Q1. To describe about any recently watched movie
Ans. 
I recently watched the movie 'Inception'.
• Directed by Christopher Nolan

• Genre: Science fiction, Action, Thriller

• Starring Leonardo DiCaprio, Joseph Gordon-Levitt, Ellen Page

• The movie explores the concept of shared dreaming and subconscious manipulation

• It has mind-bending visuals and a complex plot
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Q1. What is a pointer to pointer
Ans. 
A pointer to pointer is a variable that stores the memory address of another pointer variable.
• It is used to create dynamic data structures like linked lists and trees.

• It allows multiple levels of indirection.

• It is denoted by ** in C and C++.

• Example: int **ptr;

• Example: ptr = &p; where p is a pointer variable.
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Q2. Class, object, inheritance, polymorphism,dbms
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Q1. What are the main principles of the Java
Ans. 
Main principles of Java include object-oriented programming, platform independence, and automatic memory management.
• Object-oriented programming: Java is based on classes and objects, allowing for encapsulation, inheritance, and polymorphism.

• Platform independence: Java code can run on any platform that has a Java Virtual Machine (JVM) installed.

• Automatic memory management: Java uses garbage collection to automatically m
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Q2. What is the different between == and equals method
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The == operator compares the memory addresses of two objects, while the equals method compares the content of two objects.
• The == operator is used to compare the memory addresses of two objects in Java.

• The equals method is used to compare the content of two objects in Java.

• Example: String str1 = new String("hello"); String str2 = new String("hello"); str1 == str2 will return false, but str1.equals(str2) will return true
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Q1. What is jdk, string related questions, basic java oops questions?
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Q1. Java : Find all most occuring characters in given string only using arrays
Ans. 
Use arrays to find all most occurring characters in a given string in Java.
• Create an array to store the frequency of each character in the string.

• Iterate through the string and update the frequency array.

• Find the maximum frequency and then iterate through the frequency array to find all characters with that frequency.
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