Prasanna Technologies Java Developer Interview Questions and Answers

Q1. Basic dsa questions predict output
Ans. 
Understanding basic data structures and algorithms is crucial for predicting outputs in coding challenges.
• Data structures like arrays, linked lists, and trees are fundamental.

• Algorithms such as sorting and searching are commonly tested.

• Example: Predicting output of a sorting algorithm on an array.

• Example: Understanding how recursion works in a binary tree traversal.
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Medium level problem,

Q1. Based on resume
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45 min apps and technical question

45 min coding round you can refer net for first 15 min

Q1. What is the difference between == and .equals() in Java?
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Q2. What is a constructor in Java?
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Q1. Explain how the HashMap works internally- what happens when two keys hash to the same bucket, and how does java 8 optimize this?
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Q2. What is the difference between callable and runnable, and when would you choose one over the other in a multithreaded application?
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Q1. What do you enjoy most about working in software development and Northcorp software
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Q2. What challenges have you faced in your software development work, and how did you handle them?
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Q1. What is multithreading
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Q2. What is Spring boot
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Q1. What is Multi threading?
Ans. 
Multithreading is a programming technique that allows concurrent execution of two or more threads for improved performance.
• Multithreading enables parallel execution, improving application responsiveness.

• Java provides built-in support for multithreading through the Thread class and Runnable interface.

• Example: A web server can handle multiple client requests simultaneously using threads.

• Synchronization is crucial to prev...read more
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Q2. What is Java Mail ?
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JavaMail is an API for sending and receiving emails in Java applications, supporting various protocols like SMTP, IMAP, and POP3.
• JavaMail API allows developers to send and receive emails programmatically.

• It supports multiple protocols: SMTP for sending, IMAP and POP3 for receiving.

• Example of sending an email using JavaMail: Properties props = new Properties(); props.put('mail.smtp.host', 'smtp.example.com'); ...read more
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Q1. What is the size of an int in Java?
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Q2. The size of an int in Java is 4 bytes (32bits).
Ans. 
Yes, the size of an int in Java is indeed 4 bytes (32 bits).
• An int in Java can hold values ranging from -2,147,483,648 to 2,147,483,647.

• The size of an int can be confirmed using the 'Integer.SIZE' constant in Java.

• Using 'Integer.BYTES' will give the size of an int in bytes.
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