Girmiti Software Junior Java Developer Interview Questions and Answers

Write a program for string reverse

Q1. Difference betweeen string, stringbuffer and string builder
Ans. 
String is immutable, StringBuffer is synchronized and mutable, StringBuilder is not synchronized and mutable.
• String is immutable, meaning its value cannot be changed once it is created.

• StringBuffer is synchronized, making it thread-safe, but slower than StringBuilder.

• StringBuilder is not synchronized, making it faster than StringBuffer but not thread-safe.
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Q2. Question on OOps concept
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Q3. Abstract and interface difference
Ans. 
Abstract classes can have both abstract and non-abstract methods, while interfaces can only have abstract methods.
• Abstract classes can have constructors, interfaces cannot.

• A class can implement multiple interfaces, but can only extend one abstract class.

• Interfaces are used to achieve multiple inheritance in Java.

• Abstract classes are used to provide a common base for subclasses to extend.
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Q4. Questions on collections
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