Coding Challenges Every Java Developer Should Tackle in 2024

10

Write a Java program to reverse a string without using the reverse method of Java’s String class. Challenge yourself to solve it in at least three different ways.

1. Reverse a String Without Using String's Reverse Method

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2. Rotate Array Elements

Write a Java program that rotates the elements of an array to the right by a given number of positions without using any library methods for rotation.

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Implement a Singleton class in Java with a non-parameterized constructor, a public variable called 'str,' & a static method called 'getSingleInstance' that returns the single instance of the class.

3. Java Singleton Class

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4. MD5 Hash Generator

Create a Java class from scratch that generates an MD5 hash for an alphanumeric string. Research the MD5 algorithm and implement it without using external libraries.

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5. RESTful API Integration

Write a Java application that consumes data from a public RESTful API. Parse the JSON response and display relevant information.

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Implement a Java program with multiple threads accessing a shared resource. Use synchronization techniques to prevent race conditions and ensure data consistency.

6. Thread Synchronization

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Create a method in a Java class that checks if an array of numbers can be rearranged to form consecutive numbers with no duplicates. Return true if possible, false otherwise.

7. Consecutive Numbers Checker

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8. Find Hex Code in a String

Implement a method that searches for a hex-encoded string within another string. Return the index of the occurrence if found, or -1 if not found.

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9. Reverse Only Letters in a String

Write a method in Java that reverses only the letters in a given string while keeping the numbers in order. For example, "ez56d" should become "ed56z".

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10. Spring Boot Microservice

Develop a simple microservice using the Spring Boot framework. Implement REST endpoints, handle data storage, and ensure proper error handling.

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Get a taste of what you might face in the interviews!

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