Wunderman Thompson Commerce Java Developer Interview Questions, Process, and Tips

Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round with questions around Java.

Q1. What is the difference between @RestController and @Controller in Spring?
Ans. 
The main difference is that @RestController is a specialized version of @Controller that is used for RESTful web services.
• RestController is used for creating RESTful web services, while Controller is used for handling web requests in a traditional MVC application

• RestController eliminates the need for annotating each method with @ResponseBody as it is done automatically

• RestController returns data directly in the respons...read more
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Q2. 
Swap Two Numbers Without Using a Third Variable
Your task is to swap two given numbers without utilizing an additional variable and print the swapped values.
Input:
The first line contains an integer 't...read more
Ans. 
Swapping two numbers without using a third variable in Java.
• Use bitwise XOR operation to swap the numbers without using a third variable.

• a = a XOR b; b = a XOR b; a = a XOR b; will swap the values of a and b.

• Ensure to handle edge cases like when a and b are the same number.
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Q3. What is the Singleton Design Pattern?
Ans. 
Singleton Design Pattern ensures a class has only one instance and provides a global point of access to it.
• Ensures a class has only one instance by providing a global access point to it.

• Uses a private constructor to restrict instantiation of the class from other classes.

• Provides a static method to access the single instance of the class.

• Commonly used in scenarios where only one instance of a class is needed, such as da
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Round duration - 30 minutes
Round difficulty - Easy

HR round with typical behavioral problems.