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

class HelloWorld {
    public static void main( String args[] ) {
         //Defining all variables
         int int_number = 1000;
         char char_name = 'N';
         float float_number = 10.292f;
         double double_number = 0.00000000000512365123;
         boolean bool_accept = true;

         // Printing values of variables
         System.out.println("Value of Int is: ");
         System.out.println(String.valueOf(int_number));

         System.out.println("Value of Float is: ");
         System.out.println(String.valueOf(float_number));

         System.out.println("Value of Double is: ");
         System.out.println(String.valueOf(double_number));

         System.out.println("Value of Char is: ");
         System.out.println(String.valueOf(char_name));

         System.out.println("Value of Bool is: ");
         System.out.println(String.valueOf(bool_accept));   
    }
}

# Explanation
From lines `4` to `8`, all the variables were declared with their respective data types and values.

Then after every variable was printed using the `System.out.println` command.

In this review, the solution of the challenge 'Declaring Variables' is provided.

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

Solution Review: Declaring Variables

Given solution