QR Solutions Backend Java Developer Interview Questions and Answers

Questions on string and arrays both are moderate level questions on hacherrank type for 20 marks

Q1. Constructor chaining
Add your answer
Q2. Hasmap and treemap
Add your answer

There were 5 questions and we need to solve 4 questions in java. Mostly Array and string based.

Verbal ability
Number series
Coding questions

Q1. Self introduction
Add your answer

Their are 30 questions which one has to done in 30 mins

Q1. Q1) About the project you have done
Add your answer
Q2. Q2) some technical questions related to core Java
Add your answer

Q1. What is the difference between GET AND POST methods in HTTPS?
Ans. 
GET method is used to request data from a server, while POST method is used to submit data to a server in HTTPS.
• GET requests data from a specified resource, while POST submits data to be processed to a specified resource.

• GET requests can be cached and remain in the browser history, while POST requests are not cached and do not remain in the browser history.

• GET requests have length restrictions on the amount of data tha...read more
Answered by AI
Add your answer
Q2. GET is Retrieves and POST is Sends data.
Ans. 
GET is used to retrieve data from a server, while POST is used to send data to a server.
• GET requests are used to retrieve data from a specified resource. For example, fetching a list of products from an online store.

• POST requests are used to submit data to be processed by a server. For example, submitting a form with user information to create a new account.

• GET requests are idempotent, meaning they can be repeated mult...read more
Answered by AI
Add your answer

Q1. Oops Concepts ,Absrtraction,Polymorphism
Add your answer

Q1. What is the difference between ==and .equals() in java?
Ans. 
In Java, == compares memory addresses while .equals() compares the actual content of objects.
• == compares memory addresses of objects, while .equals() compares the actual content of objects.

• == is used to compare primitive data types, while .equals() is used to compare objects.

• Example: String str1 = new String("hello"); String str2 = new String("hello"); str1 == str2 will be false, but str1.equals(str2) will be true.
Answered by AI
Add your answer
Q2. ==compares object references, while .equals() compares object values in java.
Ans. 
In Java, == compares object references, while .equals() compares object values.
• Use == to compare if two object references point to the same memory location.

• Use .equals() to compare if two objects have the same values.

• Example: String str1 = new String("hello"); String str2 = new String("hello"); str1 == str2 will be false, but str1.equals(str2) will be true.
Answered by AI
Add your answer