Google Trainee Interview Questions and Answers for Experienced

Five rounds of coding assignments.

Create a simple project in Eclipse using a database and either Maven or Gradle.

Q1. What are your salary expectations?
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Q1. Core java questions
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Q2. Sql basics question
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Q3. Two java coding question
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Q1. Agile/scrum questions
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Q2. Experience related questions
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Q1. Salary expectations
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Q1. How can a Spring Boot project be created to develop an API that returns specified data?
Ans. 
A Spring Boot project can be created to develop an API by setting up a new Spring Boot project, defining API endpoints, and implementing the necessary logic.
• Create a new Spring Boot project using Spring Initializr

• Define API endpoints using @RestController annotation

• Implement the logic to return specified data in the API endpoints

• Use @GetMapping, @PostMapping, @PutMapping, @DeleteMapping annotations to map HTTP methods
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Q2. What is the code to print a right-angled triangle of numbers based on a given input number?
Ans. 
Use nested loops to print a right-angled triangle of numbers based on input.
• Use two nested loops to control the rows and columns of the triangle.

• Increment the number to be printed in each row.

• Example: If input is 5, the output would be: 1, 12, 123, 1234, 12345
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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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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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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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Q1. Collections framework, Explain why you chose a particular collection instead of other with example scenario based
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Q2. Explain your project
Ans. 
Developed a web application for online shopping with features like user authentication, product search, and order management.
• Implemented user authentication using Spring Security

• Utilized Hibernate for database operations

• Designed front-end using AngularJS for dynamic user interface
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