Synycs Enterprises Java Developer Interview Questions and Answers

Q1. Java Basic question , oops, Puzzle
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Q1. Deep oops question , SQL, DBMS
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Q1. In my case 3 technical round occurred
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Q2. Java , basic CN, Oops , HR oriented
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3 tough coding questions but 1 day to complete them

Q1. No of islands (graph) CS Core Recursively reverse a linked list Projects Internship exp
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Q1. Median of two sorted arrays Core Projects Internship Exp Puzzle
Ans. 
The median of two sorted arrays can be found by merging the arrays and then calculating the median.
• Merge the two sorted arrays into a single sorted array

• Calculate the median of the merged array

• Handle cases where the total number of elements is even or odd
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Q1. Shit questions, no sense
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Code was of leetcode medium level.

Q1. Easy level DS code
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Q2. Question related to database
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Q1. Questions related to SQL
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Q2. Inner join of three tables
Ans. 
Inner join of three tables in SQL
• Use the JOIN keyword to combine three tables based on a common column

• Specify the columns to select from each table

• Use the ON keyword to specify the join condition
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Q3. What is cross join
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Cross join is a type of join operation in SQL that returns the Cartesian product of two tables.
• Cross join does not require any matching condition between the tables.

• It combines each row from the first table with every row from the second table.

• Cross join can result in a large number of rows if the tables are big.

• Example: SELECT * FROM table1 CROSS JOIN table2;
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Q1. Comparable and comparator
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Q2. Instance and local variable
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Q3. Abstract and interface
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Q4. Constructor and Methods
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Q5. Http methods like post,get,put,delete
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Q1. Indepth knowledge on garbage collection
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Q2. Indepth knowledge of memory management in java
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Q3. 2 DSA questions
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Q1. How to optimize the performance if an application
Ans. 
Optimizing performance involves identifying bottlenecks and implementing efficient solutions.
• Identify and address any inefficient algorithms or data structures

• Optimize database queries and indexing

• Implement caching mechanisms to reduce redundant computations

• Use profiling tools to identify performance bottlenecks

• Consider parallel processing or asynchronous operations for resource-intensive tasks
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Q2. How to give security to our application
Ans. 
To give security to our application, we can implement various measures such as encryption, authentication, authorization, input validation, and regular security audits.
• Implement encryption to protect sensitive data, such as using SSL/TLS for secure communication.

• Use authentication mechanisms like OAuth, JWT, or multi-factor authentication to verify the identity of users.

• Implement authorization to control access to reso...read more
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