Oracle Senior Application Engineer Interview Questions, Process, and Tips

Q1. Explain internal working of HashMap,Stream operations
Ans. 
HashMap is a key-value data structure. Stream operations are used for processing collections of objects.
• HashMap uses hashing to store and retrieve key-value pairs. It has constant time complexity for basic operations like get and put.

• Stream operations are used for filtering, mapping, and reducing collections of objects. They are lazy and can be parallelized for better performance.

• Examples of stream operations include f
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Q2. DSA problem longest subarray with given sum k
Ans. 
Find the longest subarray with sum k in an array.
• Use a hashmap to store the prefix sum and its index.

• Iterate through the array and check if the current prefix sum - k exists in the hashmap.

• If it exists, update the maximum length of subarray.

• Return the maximum length of subarray.
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DSA problem for longest palindromic substring .

Q1. Core Java Spring boot
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Q2. Why String is immutable
Ans. 
String is immutable in Java to ensure security, thread safety, and optimization.
• Immutable strings are thread-safe as they cannot be modified concurrently by multiple threads.

• Immutable strings prevent security vulnerabilities like SQL injection attacks.

• Immutable strings allow for string interning, reducing memory usage and improving performance.
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Q3. Difference between ArrayList and LinkedList
Ans. 
ArrayList is implemented as a resizable array, LinkedList is implemented as a doubly linked list.
• ArrayList provides fast random access, LinkedList provides fast insertion and deletion.

• ArrayList uses more memory as it needs to allocate a fixed size array, LinkedList uses more memory for storing references to next and previous elements.

• Example: ArrayList is suitable for scenarios where random access is required, LinkedLi...read more
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Q4. Explain internal working of hashmap
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• To retrieve a value, the key is hashed a...read more
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Q1. How to use JAVA code in Oracle BPEL
Ans. 
To use JAVA code in Oracle BPEL, you can create a Java Embedding activity within a BPEL process.
• Create a Java Embedding activity within the BPEL process

• Write the Java code within the Java Embedding activity

• Compile the Java code and deploy the BPEL process
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Q2. Explain Integration BPM human task with SOA
Ans. 
Integration of BPM human task with SOA involves connecting business processes with service-oriented architecture.
• BPM human task defines the steps and actions required for a specific task in a business process.

• SOA is an architectural style that enables the creation of loosely coupled, reusable services.

• Integration involves connecting the human tasks defined in BPM with the services in SOA to automate and streamline busi...read more
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Q1. Complex scenario solved during your current job
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Q1. Explain projects done in the past
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Q1. Was asked to design a vending machine
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