Toast Software Developer Interview Questions and Answers

It was easy basic questions were there and we were asked to write two emails.

Q1. Questions related to projects
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Q2. QBasic SQL questions
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Normal Basic Interview GK, Maths,Average.

Q1. Prepare as per Domain Like Front learn Loop
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Q2. Loop with Continue
Ans. 
Using 'continue' in a loop to skip current iteration and move to the next one.
• Continue statement is used to skip the current iteration of a loop and move to the next one.

• Helps in avoiding unnecessary code execution within a loop.

• Example: for(int i=0; i<5; i++) { if(i == 2) { continue; } System.out.println(i); }
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Q1. Implement readers-writer lock
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There were 50 question out of which if you score 20 you were passed out to next round, No negative markings.

Q1. Explain basics of c#
Ans. 
C# is a programming language developed by Microsoft for building a wide range of applications on the .NET framework.
• C# is an object-oriented language with features like classes, inheritance, and polymorphism.

• It is strongly typed, meaning variables must be declared with a specific data type.

• C# supports modern programming concepts like async/await for asynchronous programming.

• It is commonly used for developing desktop, w...read more
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Q2. C# basics oops sql server
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Q1. Oops? .net core features
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Q1. Linked list (detect loop, reverse, delte a node) tree (height, DFS) graph theory concept C++ basic questions
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Q1. Total 3 round of Technical interviews.
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Round duration - 60 minutes
Round difficulty - Easy

The second round is also written but you need to write programming based on their concept.

Q1. Find prime numbers
You are given a positive integer ‘N’. Your task is to print all prime numbers less than or equal to N.
Note: A prime number is a natural number that is divisible only by 1 and itself. ...read more
Ans. 
The naïve approach for this question is to run a loop from the start to the end number. And for each number, check if it is prime or not. If the number is prime, we print it otherwise skip it.

One optimization to this approach would be to skip all even numbers (except 2 if present in interval) since even numbers are not prime.
Function to check if a number is prime or not :
isPrime(n):
if (n <= 1) return false
for (i=2;
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Q2. Check If The String Is A Palindrome
You are given a string 'S'. Your task is to check whether the string is palindrome or not. For checking palindrome, consider alphabets and numbers only and ignor...read more
Ans. 
The idea is to create a copy of num and recursively pass the copy by reference, and pass num by value. In the recursive calls, divide num by 10 while moving down the recursion tree. While moving up the recursion tree, divide the copy by 10. When they meet in a function for which all child calls are over, the last digit of num will be ith digit from the beginning and the last digit of copy will be ith digit from the end
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Round duration - 60 minutes
Round difficulty - Easy

Technical round with questions mainly on Java and OOPS concepts.

Q1. Java Question
Difference between Static methods and Instance methods
Ans. 
Instance method can access the instance methods and instance variables directly.
Instance method can access static variables and static methods directly.
Static methods can access the static variables and static methods directly.
Static methods can’t access instance methods and instance variables directly. They must use reference to object. And static method can’t use this keyword as there is no instance for ‘this’ to ref
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Q2. Java Question
Difference between Abstract Class and Interface
Ans. 
1) Abstract class can have abstract and non-abstract methods. Interface can have only abstract methods. Since Java 8, it can have default and static methods also.
2) Abstract class doesn't support multiple inheritance. Interface supports multiple inheritance.
3) Abstract class can have final, non-final, static and non-static variables. Interface has only static and final variables.
4) Abstract class can provide the implem...read more
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Q3. Java Question
ClassNotFoundException Vs NoClassDefFoundError in Java
Ans. 
1. As the name suggests, ClassNotFoundException is an exception while NoClassDefFoundError is an error.
2. ClassNotFoundException occurs when classpath does not get updated with required JAR files while error occurs when the required class definition is not present at runtime.
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Q4. Java Question
Difference between Error and Exception
Ans. 
1 Type : 
Error : Classified as an unchecked type 
Exception : Classified as checked and unchecked 
2 Package :
Error : It belongs to java.lang.error 
Exception : It belongs to java.lang.Exception 
3 Recoverable/ Irrecoverable : 
Error : It is irrecoverable
Exception : It is recoverable
4 Error : It can't be occur at compile time 
Exception : It can occur at run time compile time both 
5 Ex...read more
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Q5. Java Question
What is SerialVersionUID?
Ans. 
The serialization at runtime associates with each serializable class a version number called a serialVersionUID, which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization.
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Q6. Java Question
What are the requirement for creating a Immutable Class in Java?
Ans. 
Following are the requirements: 

The class must be declared as final so that child classes can’t be created.
Data members in the class must be declared private so that direct access is not allowed.
Data members in the class must be declared as final so that we can’t change the value of it after object creation.
A parameterized constructor should initialize all the fields performing a deep copy so that data members can...read more
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