---
title: "Dhiraj Sardar (@Dhiraj567) | Hashnode"
description: "Java Developer. Read the latest articles by Dhiraj Sardar on Hashnode."
url: "https://hashnode.com/@Dhiraj567"
---

@Dhiraj567

# Dhiraj Sardar

@Dhiraj567 · Bangalore · Joined November 2022

Java Developer

### [Exploring Java Wildcards: When to Use Unbounded, Upper or Lower Bounded](https://tech@withdhiraj.com/exploring-java-wildcards-when-to-use-unbounded-upper-or-lower-bounded?utm_source=hashnode&utm_medium=feed)

In Java, a wildcard is a special syntax that allows you to specify a type parameter as "unknown" or "unspecified". It is denoted by the question mark character ? and can be used in a few different ways. The three main types of wildcards in Java are: ...

2 min read · [withdhiraj.com](https://tech@withdhiraj.com/exploring-java-wildcards-when-to-use-unbounded-upper-or-lower-bounded?utm_source=hashnode&utm_medium=feed)

[May 2, 2023](https://hashnode.com/posts/exploring-java-wildcards-when-to-use-unbounded-upper-or-lower-bounded/64508029a0f35c6c06495b6c)

### [Generic in Java : A Comprehensive Guide](https://tech@withdhiraj.com/generic-in-java-a-comprehensive-guide?utm_source=hashnode&utm_medium=feed)

Generic in Java

3 min read · [withdhiraj.com](https://tech@withdhiraj.com/generic-in-java-a-comprehensive-guide?utm_source=hashnode&utm_medium=feed)

[Apr 30, 2023](https://hashnode.com/posts/generic-in-java-a-comprehensive-guide/644ddbf8cdcfa81ad66c1351)

### [Introduction to Java](https://tech@withdhiraj.com/introduction-to-java?utm_source=hashnode&utm_medium=feed)

What is Java ? Java is a high-level programing language which is used in for doing multiple tasks like app development ,software development and so on. In java all the code and stuff are categorized in the form of classes. How to make a java class...

1 min read · [withdhiraj.com](https://tech@withdhiraj.com/introduction-to-java?utm_source=hashnode&utm_medium=feed)

[Nov 30, 2022](https://hashnode.com/posts/introduction-to-java/6386b065ce34d53afa545b65)