Fortune4 Technologies 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

Easy

Q1. Tell me about yourself Why you choose IT & developer role OOPs concept, sample Java program
Add your answer

Q1. Personal and salary details.
Add your answer

Q1. How can you create immutable class in Java?
Ans. 
Immutable class in Java cannot be modified after creation, ensuring data integrity.
• Make the class final so it cannot be extended

• Make all fields private and final so they cannot be modified

• Do not provide setter methods, only getter methods to access the fields

• If the class contains mutable objects, make sure to return a deep copy of them in getter methods
Answered by AI
Add your answer
Q2. 1 : Declare the class as final. 2 : Make all fields private and final. 3 : Provide no setter methods.
Ans. 
The question is asking to create a class with certain restrictions like being final, having private and final fields, and no setter methods.
• Declare the class as final to prevent it from being subclassed.

• Make all fields private and final to ensure encapsulation and immutability.

• Provide no setter methods to enforce read-only access to the fields.
Answered by AI
Add your answer

Q1. Oops Concepts ,Absrtraction,Polymorphism
Add your answer

Q1. What is the purpose of static keyword in Java?
Ans. 
The static keyword in Java is used to create class-level variables and methods that can be accessed without creating an instance of the class.
• Static variables are shared among all instances of a class.

• Static methods can be called without creating an instance of the class.

• Static blocks are used to initialize static variables.

• Static keyword can also be used to create static nested classes.
Answered by AI
Add your answer
Q2. The static keyword is used to create class-level variable and methods ............etc.
Add your answer

Q.1 Pattern
1
*2*
**3**
Q. 2
write code to get sub array with max sum from given array.

Q1. Introduction Project Deatails Oops Concept Collection Exception Handling Abstract Class Functional Interface Spring Framework
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

Basic aptitude round

Q1. 1.Java, OOPs concept 2. HTML,CSS,JS 3.DSA
Add your answer
Q2. Explain your project
Add your answer

Q1. Java Coding questions
Add your answer