Persistent Systems Interview Questions, Process, and Tips for Experienced

Q1. Sql questions were asked
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Q1. Java Coding questions
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Q1. Java coding questions related to Array and strings
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Q1. Find the longest substring without repeating characters
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Find the longest substring without repeating characters in a given string.
• Use a sliding window approach to iterate through the string and keep track of the characters seen so far.

• Update the start index of the window when a repeating character is encountered.

• Keep track of the longest substring length and characters seen in a hashmap.
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Q2. Given a time array, check if the user can attend all meeting. Array had pairs - start time and end time
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Q1. HOW JVM works ?
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JVM is a virtual machine that executes Java bytecode. It manages memory, provides security, and facilitates garbage collection.
• JVM loads the bytecode generated by the Java compiler and interprets it.

• It uses Just-In-Time (JIT) compilation to improve performance by compiling frequently used code into native machine code.

• JVM manages memory through garbage collection, freeing up memory occupied by objects that are no longe...read more
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Q2. Hash Map internal working?
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Hash Map is a data structure that stores key-value pairs and uses a hash function to map keys to their corresponding values.
• Hash Map uses a hash function to determine the index of the key-value pair in the underlying array.

• Collisions can occur when multiple keys hash to the same index, which can be resolved using techniques like chaining or open addressing.

• Hash Map provides constant time complexity O(1) for insertion,
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Q1. What is stereo annotation ?
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Stereo annotation is the process of labeling or tagging images or videos with depth information to create a 3D effect.
• Stereo annotation involves identifying corresponding points in a pair of images or frames to determine depth perception.

• It is commonly used in computer vision tasks such as object detection, tracking, and scene understanding.

• Examples of stereo annotation include creating depth maps for autonomous drivin
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Q2. Muti threading.
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Q1. Questions on java collection sql queries and skillset mentioned.
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