Oracle Associate Consultant Interview Questions, Process, and Tips

Very basic programming

Very easy and basic maths, reasoning questions

Q1. Explain the four pillars of OOPS, their significance and how you leveraged them in your projects?
Ans. 
The four pillars of OOPS are encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: Using private variables and public methods in a class.

• Inheritance: Allowing a new class to inherit properties and behavior from an existing class. Example: Creating a subclass that inherits from a superclass.

• Polymorphism: The ability to pre...read more
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Q1. This was HR plus technical man=inly focusing on extra curricular activities but still domain related
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4 levels. English comprehension, aptitude, psychometry and finance

Group of 6 in each GD

Case study solving and presentation

Q1. Random topics one can use
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Q1. General questions
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Q1. 1. Write a program to remove duplicate elements from String and mention the count of duplication.
Ans. 
Program to remove duplicate elements from String and count their occurrences.
• Create a HashSet to store unique characters from the String.

• Iterate through the String and add each character to the HashSet.

• While adding, check if the character already exists in the HashSet and increment its count.

• Print the count of each character that has duplicates.

• Return the modified String with duplicates removed.
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Q2. 2. Write a program to capitalise all the first letter of a word in a sentence.
Ans. 
A program to capitalize the first letter of each word in a sentence.
• Split the sentence into words

• Loop through each word and capitalize the first letter

• Join the words back into a sentence
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Q3. 3. How map works internally in Java
Ans. 
Java Map is an interface that maps unique keys to values. It works internally using hash table data structure.
• Map interface is implemented by HashMap, TreeMap, LinkedHashMap, etc.

• Keys in a map must be unique and values can be duplicated.

• Hash table data structure is used to store key-value pairs internally.

• Hashing is used to convert keys into indices of an array where values are stored.

• Collision resolution techniques li...read more
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Q4. 4. When to use list and when to use linked list.
Ans. 
Lists are used for small collections, linked lists for large or frequently modified collections.
• Use lists for small collections that don't require frequent modifications.

• Use linked lists for large collections or collections that require frequent modifications.

• Linked lists are better for inserting or deleting elements in the middle of the collection.

• Lists are better for accessing elements by index.

• Example: Use a list to...read more
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Q5. 5. Difference between primitives and wrapper class in Java.
Ans. 
Primitives are basic data types in Java while wrapper classes are objects that wrap around primitives.
• Primitives are faster and take less memory than wrapper classes.

• Wrapper classes provide additional functionality like conversion to and from strings.

• Primitives are passed by value while wrapper classes are passed by reference.

• Examples of primitives include int, boolean, and double while examples of wrapper classes incl
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Q6. 6. Explain JVM architecture.
Ans. 
JVM is an abstract machine that executes Java bytecode. It consists of class loader, runtime data area, and execution engine.
• JVM stands for Java Virtual Machine.

• It is responsible for executing Java bytecode.

• JVM architecture consists of class loader, runtime data area, and execution engine.

• Class loader loads the class files into the memory.

• Runtime data area is divided into method area, heap, and stack.

• Execution engine e...read more
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Q7. 7. Why String is immutable
Ans. 
String is immutable because it cannot be changed once created.
• Immutable objects are safer to use in multi-threaded environments.

• String pool in Java is possible because of immutability.

• StringBuffer and StringBuilder are mutable alternatives to String.
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Q8. 8. Different Java 8 features.
Ans. 
Java 8 introduced several new features including lambda expressions, streams, and default methods.
• Lambda expressions allow for functional programming and simplify code.

• Streams provide a way to process collections of data in a functional way.

• Default methods allow for adding new methods to interfaces without breaking existing implementations.

• Other features include the Optional class, Date and Time API, and Nashorn JavaSc...read more
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Q9. 9. Types of functional interface.
Ans. 
Functional interfaces are interfaces with only one abstract method. There are four types of functional interfaces.
• Consumer: accepts a single argument and returns no result. Example: Consumer

• Supplier: takes no argument and returns a result. Example: Supplier

• Predicate: takes a single argument and returns a boolean. Example: Predicate

• Function: takes a single argument and returns a result. Example: Function
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Q10. 10. Write a program to separate even and odd numbers using Java 8.

Ans. 

Program to separate even and odd numbers using Java 8.

• Use Java 8 Stream API to filter even and odd numbers

• Create two separate lists for even and odd numbers

• Use lambda expressions to filter the numbers

• Example: List evenNumbers = numbers.stream().filter(n -> n % 2 == 0).collect(Collectors.toList());

• Example: List oddNumbers = numbers.stream().filter(n -> n % 2 != 0).collect(Collectors.toList());

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