Ohhpro Technologies Java Developer Interview Questions, Process, and Tips

Q1. Write a Java program to reverse a string.
Ans. 
A Java program to reverse a string.
• Create a char array from the input string

• Use two pointers to swap characters from start and end of the array

• Convert the char array back to a string and return
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Q2. Write a Program to remove duplicate elements from ArrayList.
Ans. 
Program to remove duplicate elements from ArrayList
• Create a new HashSet to store unique elements

• Iterate through the ArrayList and add elements to the HashSet

• Convert the HashSet back to an ArrayList to remove duplicates
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Q3. Write a Program to print Longest non repeating substring.
Ans. 
Program to print Longest non repeating substring
• Use a sliding window approach to iterate through the string

• Keep track of the characters seen so far in a set

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

• Calculate the length of the current substring and update the longest substring found so far
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Q4. Without Using collection and stream , write the solution for 3rd question
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Q5. Create DB schema and Build RESTFul API using SpringBoot,
Ans. 
Design DB schema and create RESTFul API using SpringBoot
• Design the database schema with tables, relationships, and constraints

• Create entity classes in Java corresponding to the database tables

• Use Spring Data JPA to interact with the database

• Implement RESTful endpoints using Spring Boot controllers

• Use annotations like @GetMapping, @PostMapping, @PutMapping, @DeleteMapping for mapping HTTP requests to controller methods

• S...read more
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Q6. Another String question was there.
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Basic java and advanced java

Q1. What is interface
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