Greenstone Senior Developer Interview Questions and Answers

Q1. HashMap internal working
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Q1. Java 8 questions
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Q1. Salary discussion
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Q1. Sliding Window find the subarray with sum equal to k
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Using sliding window technique to find subarray with sum equal to k.
• Initialize two pointers at the start of the array.

• Move the right pointer to expand the window until the sum is greater than or equal to k.

• Move the left pointer to shrink the window if the sum exceeds k.

• Repeat until the end of the array is reached.

• Example: Input array [1, 4, 20, 3, 10, 5], k=33. Output: [20, 3, 10].
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Q1. Java8 stream API, functional interfaces
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Q2. Collections, spring boot
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Q1. Why you wanto to join tcs?
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I want to join TCS because of its reputation for innovation and growth opportunities.
• TCS is known for its cutting-edge technology solutions

• Opportunities for career advancement and skill development

• Global presence and diverse client base
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Q1. Salary discussion
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Q1. Difference between custom setting and custom metadata
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Custom settings are org-specific, while custom metadata can be deployed across orgs.
• Custom settings are hierarchical and can be accessed using a hierarchy custom setting type

• Custom metadata is deployable and can be used in managed packages

• Custom settings are stored in the application cache, while custom metadata is stored in the metadata cache
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Q2. Difference between profile and role
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Profile is a summary of a person's skills and experience, while role is the specific job or position they hold within an organization.
• Profile is a broader overview of a person's qualifications and background.

• Role is a specific set of responsibilities and tasks assigned to an individual within a company.

• Profiles can include education, work experience, skills, and achievements.

• Roles can be defined by job titles such as S...read more
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Q1. What is singleton class
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A singleton class is a class that can only have one instance created throughout the application.
• Singleton classes are often used for logging, caching, database connections, and thread pools.

• They have a private constructor to prevent multiple instances from being created.

• The class typically provides a static method to access the single instance.
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Q2. What is Method reference
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Method reference is a shorthand syntax for lambda expressions to call a method.
• Method reference is used to refer to a method without invoking it.

• It can be used to make code more concise and readable.

• There are four types of method references: static, instance, constructor, and array constructor.
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Sample code round to implement the weather API

Q1. Discussion about salary package
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Q1. Android basics question to threads
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Q1. Explain oops concepts
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Object-oriented programming concepts like inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and showing only the ne
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Q2. Explain solid principles
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SOLID principles are a set of five design principles that help developers create more maintainable and scalable software.
• Single Responsibility Principle (SRP) - A class should have only one reason to change.

• Open/Closed Principle (OCP) - Software entities should be open for extension but closed for modification.

• Liskov Substitution Principle (LSP) - Objects of a superclass should be replaceable with objects of its subcla...read more
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