Become an intermediate level Java developer, ready to take on your own projects.

Become a Spring Boot Developer

Learn Java for free with this interactive module, and get a handle on one of the most popular programming languages in the world.

You'll start with a simple hello world program and proceed to cover common concepts such as conditional statements, loop statements, math, and logic in Java, before moving on to more advanced concepts like inheritance, generics, and ArrayLists, along with much more.

Core Java Concepts

The legal indexes of the character array  ```arr={'a','r','b','e'} ``` are:

The legal indexes of the character array <code>arr={'a','r','b','e'} </code> are:

What is the output of the following code fragment?
 
````java
 boolean[] arr =new boolean[3];
			arr[0]= (arr.length==2);
 arr[1]= (arr.length==3);
 System.out.print(arr[0]+" "+arr[1]+" "+arr[2]);

What is the output of the following code fragment?
 
<pre><code class="language-java"> boolean[] arr =new boolean[3];
			arr[0]= (arr.length==2);
 arr[1]= (arr.length==3);
 System.out.print(arr[0]+&quot; &quot;+arr[1]+&quot; &quot;+arr[2]);
</code></pre>

A two-dimensional array can be thought of as a

A two-dimensional array can be thought of as a

In the instantiation of a two-dimensional array:
```java
int[][] twoDimArr= new int[m][n];
```
what does m and n represent respectively?

In the instantiation of a two-dimensional array:
<pre><code class="language-java">int[][] twoDimArr= new int[m][n];
</code></pre>
what does m and n represent respectively?

Let's test your understanding by solving a quiz in this lesson.

Before We Begin

Getting Started with Java!

Variable and User Input

Simple Maths & Logic

Strings and String Processing

Conditional Statements

Loops

Methods

Arrays

Classes and Inheritance

Generics

ArrayLists

Java Exam

Conclusion

Quick Quiz!