CashLink Global Systems Java Developer Interview Questions and Answers

Logic based multiple mcq type questions

Q1. Opps concepts, multi threaded
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Reverse of string code

Q1. What is DBMS structure
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Q2. What is API and MQTT
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Q1. Core java - collection framework
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Q1. Advance java - spring boot
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Q1. Code singleton design pattern in java
Ans. 
Singleton design pattern ensures a class has only one instance and provides a global point of access to it.
• Create a private static instance of the class

• Provide a public static method to access the instance

• Ensure the constructor is private to prevent instantiation of multiple objects
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Q2. 2 sum in java
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2 sum problem in Java involves finding two numbers in an array that add up to a specific target value.
• Use a HashMap to store the difference between the target value and each element in the array.

• Iterate through the array and check if the current element's complement exists in the HashMap.

• Return the indices of the two numbers that add up to the target value.
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Q3. How to make a class immutable
Ans. 
To make a class immutable, ensure that its state cannot be changed after instantiation.
• Make all fields private and final

• Do not provide setter methods

• Ensure that any mutable objects within the class are also made immutable
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Q4. Async annotation
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Q5. Spring-starter dependencies
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Q1. What is cyclomacic complexity
Ans. 
Cyclomatic complexity is a software metric used to measure the complexity of a program.
• It measures the number of linearly independent paths through a program's source code.

• It helps in identifying complex code that may be difficult to maintain or test.

• A higher cyclomatic complexity indicates a higher risk of errors and bugs in the code.

• It is calculated using the formula: E - N + 2P, where E is the number of edges, N is ...read more
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Q2. Simple output questions based on inheritance
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Q3. OWASP top 10 security vulnerabilities
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Q1. Data Structure and algorithm
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Q2. System design question
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2 Questions - One Easy and One Medium

Q1. Some Basics of DBMS and one DSA related question
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Q1. There were 3 dsa questions which were of topic arrays and strings
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Q1. It was more like a managerial round where they asked questions about resume projects and past experience
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Basic quant questions and logical reasoning, c++ and java

Q1. Find the palindrome in the string?
Ans. 
To find palindromes in a string, compare characters from both ends towards the middle.
• Iterate through each string in the array

• Check if the string is equal to its reverse to determine if it's a palindrome

• Examples: 'level', 'radar', 'madam'
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Q2. Difference between linked list and array?
Ans. 
Arrays store elements in contiguous memory locations, while linked lists store elements in nodes with pointers to the next node.
• Arrays have fixed size, while linked lists can dynamically grow or shrink.

• Accessing elements in arrays is faster (O(1)), while in linked lists it is slower (O(n)).

• Inserting or deleting elements in arrays can be inefficient, while in linked lists it is efficient.

• Example: Array - [1, 2, 3, 4], L
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Q1. Are you comfortable with relocating?
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Q2. Tell us about your family members?
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