Java Basics

Java Basics

• Java Basics
• POJO
• Bean

• String Immutability
• String Pool
• dynamic method dispatch
• abstract class
• Can static, private, final methods be overridden?
• difference between interface and abstract class?
• achieve Multiple Inheritance in JAVA?
• What is the difference between inner class and nested class?
• final class, final method
• What is final field, static field
• What is singleton class
• When can you override clone method of Object class
• What is an extensible framework?
• why JAVA is platform independent?
• Can we have multiple constructors in a class
• super and this?
• What is the difference between String Builder and String Buffer?
• What is the difference between == and .equals()?
• The internal working of Hash-map in java?

POJO

Bean

Ref: https://stackoverflow.com/questions/3295496/what-is-a-javabean-exactly Spec: https://www.oracle.com/java/technologies/javase/javabeans-spec.html