Java Interview questions

• What is oops in Java?
• What is encapsulation?
• What is polymorphism?
• write a program to check prime number
• write a program to reverse a number
• what is inheritance
• what is the difference between arraylist and linkedlist
• what is final keyword in java
• What is immutable object?
• What is the difference between StringBuffer and StringBuilder in Java
• What is the difference between ArrayList and Vector ?
• What is Singleton ?
• What is the difference between a synchronized method and a synchronized block ?
• what is a deadlock
• What is the importance of hashCode() and equals() methods ?
• what is the purpose of garbage collection in java and when is it used
• what are the different types of exceptions in java
• what is the difference between throw and throws and throwable in java
• When to use ArrayList and when to use LinkedList in application?