SAP Java Developer Interview Questions and Answers

Q1. Min stack write code with full operation
Ans. 
A min stack is a stack data structure that supports the usual push and pop operations, along with an additional operation to retrieve the minimum element in constant time.
• Create a stack to store the elements and another stack to store the minimum values encountered so far.

• When pushing an element, check if it is smaller than the current minimum. If so, push it onto the minimum stack.

• When popping an element, check if it ...read more
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Q2. Graph and sql ,concept problem
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Q1. Merge Sort based tricky ques
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Q2. Island problem leetcode
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Asked about introduction and then few coding questions

Q1. Given a code, what will be the output of this?
Ans. 
The output of the code will be the sum of the elements in the given array.
• The code likely involves iterating through the array and adding up the elements.

• Make sure to handle edge cases like empty arrays or arrays with negative numbers.

• Example: If the array is [1, 2, 3], the output will be 6.
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Q2. What is a hashMap and difference between HashMap and concurrentHashMap
Ans. 
HashMap is a data structure in Java that stores key-value pairs. ConcurrentHashMap is a thread-safe version of HashMap.
• HashMap is not thread-safe, while ConcurrentHashMap is thread-safe.

• ConcurrentHashMap allows concurrent read and write operations without the need for external synchronization.

• HashMap allows null keys and values, while ConcurrentHashMap does not allow null keys or values.
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BST formation code in java

Q1. Multi Threading consumer producer
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Q2. User Defined Exceptions
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Q1. Scenario based question
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Q2. Work Life Balance
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