Checkpoint Systems Senior Android Developer Interview Questions and Answers

Simple leetcode easy problems like- merge two sorted array with duplicate numbers,valid parentheses, two sum,three sum.

Q1. Hr round simple behaviour questions. Tell me something about you self.
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Q2. Salary negotiation there.etc
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Q1. EXPERIENCE BASED QUESTIONS
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Q2. BASICS 0F MECHANICAL ENGINEERING
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Q1. GENERAL INTRODUCTION
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Q2. STRENGTH AND WEAKNESS
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Q1. Basic oops concept
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OOP is a programming paradigm based on objects, encapsulating data and behavior for better code organization and reuse.
• Encapsulation: Bundling data and methods that operate on the data within one unit (e.g., a class).

• Inheritance: Mechanism to create a new class using properties and methods of an existing class (e.g., a 'Dog' class inheriting from an 'Animal' class).

• Polymorphism: Ability to present the same interface fo...read more
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Q1. NodeJS event loop
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Q2. What isClosure explain with example
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A closure is a function that has access to its own scope, as well as the outer function's scope.
• Closure allows a function to access variables from its outer function even after the outer function has finished executing.

• Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log(outerVar); }; }

• When innerFunction is called, it can still access outerVar even though outerF...read more
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Q1. What is retain , weak, strong, atomic etc in Objective C
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Retain, weak, strong, atomic are property attributes in Objective-C for memory management and thread safety.
• Retain: Increases the reference count of an object.

• Weak: Does not increase the reference count, used to avoid retain cycles.

• Strong: Increases the reference count and keeps the object in memory until all references are removed.

• Atomic: Guarantees that the value is always fully retrieved or set in a multi-threaded e...read more
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Q2. ARC in Objective C
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ARC (Automatic Reference Counting) is a memory management feature in Objective-C that automatically manages memory for objects.
• ARC automatically inserts retain, release, and autorelease calls at compile time to manage memory.

• It helps prevent memory leaks and makes memory management easier for developers.

• Example: 'NSString *name = [[NSString alloc] initWithString:@"John"];' - ARC will automatically handle memory managem...read more
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Q1. DSA question on Array
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Q2. Calender based DSA question
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Basic questions on maths related parts and analysis skills

Coding questions from various Data Structure parts like linkedList stack queue