Gain insights into Java essentials, including programming paradigms, objects, data types, and algorithms. Delve into extensive exercises to prepare for a software development career.

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This course is your detailed guide to the fundamentals of the Java programming language. This course will get you on the fast track to becoming a proficient and modern Java developer.

In this course, you will start by covering different programming paradigms like object-oriented and procedural programming. You will then cover the fundamentals of programming in Java such as: objects and data types, variables, arrays, and conditional statements.

In the latter half of the course, you will cover iterative constructs, useful algorithms, and data structures. With over 100 problems, 11 quizzes, and 9 challenges, this course will get you prepared for a career in software development.

A Complete Guide to Java Programming

# Coding solution

Let’s take a look at the solution first.


class ReversingNumber {
    static int reverseNumber(int num){
        int temp = 0, remain = 0;
        while (num > 0){
            remain = num % 10;
            temp = temp * 10 + remain;
            num /= 10;
        }
        return temp;
    }
}

public class ReverseNum {
    public static void main(String[] args) {
        int num = 654321;
        System.out.println("We are going to reverse the number: " + num +
         "\nThe result is: " + ReversingNumber.reverseNumber(num));
    }
}

## Explanation

The core part of the program starts at **line 4**. If the number is greater than `0`, we’ll take the modulus of the number using the value `10` which will give us the rightmost digit of the number. On **line 6**, we’ll save the digit to `temp` variable each time by shifting one place from the right side. On **line 7**, we’ll remove the digit which we have added to the `temp` variable each time.



The solution to the ‘Reverse any Number’ challenge is discussed in this lesson.


Java, a High Level Language with a Purpose

How Java Programming Works

Objects and Data Types

Variables: The Name of a Field

Arrays: The Container Objects

Operators and Conditional Statements

Iterative Constructs, Entry and Exit Controlled Loops

Algorithms

Basic Input and Output

Classes and Objects

Interface and Abstraction

Exception Handling and Data Structures

Conclusion

Appendix

Solution Review: Reverse any Number

Coding solution