ScoreMe Solutions Junior Java Developer Interview Questions and Answers

The mainly questions asked on String, pattern programming, Oops ( Interface, Abstraction , Inheritence, Overloading, Overriding) etc.

Q1. Why we need Oops concepts? What is Constructor? Need of Constructor? StringBuilder? etc.
Ans. 
OOPs concepts are important for code reusability, maintainability, and scalability. Constructors are special methods used to initialize objects.
• OOPs concepts help in creating modular, reusable, and maintainable code.

• Inheritance, polymorphism, encapsulation, and abstraction are the four pillars of OOPs.

• Constructors are special methods used to initialize objects with default or user-defined values.

• StringBuilder is a clas...read more
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Q1. What are 4 pillars of OOPs diffrence between String,String Buffer,String Builder Some questions on Collection framework
Ans. 
4 pillars of OOPs, difference between String, StringBuffer, StringBuilder, and Collection framework
• 4 pillars of OOPs: Abstraction, Encapsulation, Inheritance, Polymorphism

• String is immutable, StringBuffer and StringBuilder are mutable

• StringBuffer is synchronized, StringBuilder is not

• Collection framework includes interfaces like List, Set, Map and their implementations

• Commonly used classes in Collection framework: Array
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Q1. Coding question Explain OOPs concept given 5-6 codes and asked what will be output
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