Intellect Design Arena Java Developer Interview Questions, Process, and Tips

Q1. Difference between hashset and hashtable
Ans. 
HashSet is an unordered collection of unique elements, while Hashtable is a synchronized collection of key/value pairs.
• HashSet does not allow duplicate elements, while Hashtable does not allow duplicate keys.

• HashSet does not maintain insertion order, while Hashtable does not guarantee any order.

• HashSet allows null values, while Hashtable does not allow null keys or values.
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Q2. Collection vs Collections
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Collection is an interface in Java that represents a group of objects, while Collections is a utility class that contains static methods for operating on collections.
• Collection is an interface in Java that represents a group of objects.

• Collections is a utility class in Java that contains static methods for operating on collections.

• Example: List list = new ArrayList<>(); Collection collection = list;

• Example: Collections
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Q1. SQL query related questions
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Q2. Write a Java program to find the duplicate in Array
Ans. 
Java program to find duplicates in an array of strings
• Create a HashSet to store unique elements

• Iterate through the array and check if element is already in the HashSet

• If element is already in the HashSet, it is a duplicate
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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. 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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Basic CS aptitude question

2 questions from Java and 2 questions from SQL, Easy to Medium Level

They let us choose our topic , We have to speak on that topic for few minutes , they will be checking the english fluency and presentation

Q1. Technical Round I got lucky; they asked me basic java questions and Basic SQL theory
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Q2. Create an array and sort them in descending order
Ans. 
Create and sort an array of strings in descending order
• Create an array of strings

• Use Arrays.sort() method with Collections.reverseOrder() comparator to sort in descending order
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Q3. Create an array and add the array
Ans. 
Create an array of strings and add the array
• Declare an array of strings

• Initialize the array with values

• Use a loop to add the values to the array
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Occurance of every elements in string

Q1. All basic question core java
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