Interview questions for Java, Angular, SQL and Unix

Java Versions, Features(Java 8, 7, 6, 5 and 1.4

Java 8 new features

Java 11 features

Java 17 features

Java 21 features

Java 8 Lambda Expressions

Java 1.8 Interview Questions

How to avoid add elements to an ArrayList in Java once a specified limit is reached?

How to close database connections/file connections with out using close() method in java

Java Interview Questions:

Core Java Interview Questions

Difference between Abstract Class and Interface in Java

OOPS Concepts: Association, Aggregation and Composition

Difference between ClassNotFoundException Vs NoClassDefFoundError In Java

WhenTo Use “==”, equals () and hashCode () On Strings

Why string is immutable in java

How The Strings Are Stored in The Memory?

Difference Between Shallow Copy Vs Deep Copy in Java

What are Marker Interfaces in Java?

Serialization and Deserialization in Java

Static Blocks in Java

Enumerations or Enums

serialization-and-externalization-in-java

Internal-working-of-hashmap-java

Java Collections Topics:

Java Collections Interview Questions

Collection Framework – Class Hierarchy

Difference between ArrayList and LinkedList

Difference between ArrayList and Vector Class

Hash MapInterview Questions in java

How ConcurrentHashMap Internally Works in Java.

Difference between ConcurrentHashMap and HashMap

How HashSet Works Internally in Java?

FailFast v/s Fail Safe Iterators in Collections

Difference between HashMap and HashTable in Java

Java Memory management Topics:

Memory Management in Java

Monitoring and detecting memory leaks in java application

Why does my Java process consume more memory than Xmx?

Java Multithreading Topics:

Java multithreading Interview Questions

What is Thread?

Lifecycle of a Thread

Different Ways to Create Thread in Java

Interthread Communication Using wait(), notify() and notifyAll()

Synchronization in Thread indepth

Thread interruption in java

Producer Consumer Problem in Java

What is a deadlock and how to avoid it in Java?

Angular Interview Questions

SQL Interview Questions

Unix - Useful Commands

JSON tutorial