OnlineSales.ai Interview Experience for Java Backend Developer

Deutsche Telekom Interview Experience for Java Backend Developer Round 1

Last Updated : 29 Apr, 2024

1. The interview started with an explanation of the current project.
2. Suppose we have 3 micro services A-B-C and they communicate with each other synchronously. Suppose service C is down and it might make other services go down. How can we prevent other services from communicating with service C?

3. DSA PROBLEM: Suppose I am given an array with integer values and i need to check if it is a mountain array or not. Mountain array is that array which have all the elements in increasing order first and then in decreasing order. Example : [1,2,3,4,5,3,2]

4. DSA PROBLEM: I am given an array with 0 and 1 only and a value K. I need to find what is the length of a maximum number of consecutive 1's when maximum K 0s are swapped. Example: [1,1,1,0,0,0,1,1,1,1,0] - output is 6

5. Basic Java Questions - Difference between public, protected, private, and default?

6. What are abstract methods?

7. Can we override private methods in Java and why?

8. Collections Questions - Can we store null or duplicate values in HashSet?

9. Can we store null or duplicate values in the hashmap?

OnlineSales.ai Interview Experience for Java Backend Developer

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