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.


public class RLVariables {
    private int mySecretNumber = 10;

    public void displaySecret() {
        mySecretNumber = 45;
        RLVariables secret = new RLVariables();
        System.out.println("Reference variable accessing instance variable: " + secret.mySecretNumber);
        System.out.println("Local Variable: " + mySecretNumber);
        secret.mySecretNumber = mySecretNumber;
        System.out.println("Reference variable accessing instance variable that points to the local variable: " + secret.mySecretNumber);
    }

    public static void main(String [] args){
        RLVariables notSoPrivate = new RLVariables();
        notSoPrivate.displaySecret();
    }
}

## Explanation

This output is expected. We can get the local variable’s value separately. Still, we can have instance variable’s values using the reference variable in the first line.

```java
Reference variable accessing instance variable : 10
Local Variable : 45
Reference variable accessing instance variable that points to the local variable : 45
```

You need to be careful about the usage of the local variable. The scope is always inside the curly braces. Whatever method we use, it is visible only inside that method.

The solution to the Reference and Local Variables exercise is explained 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: Reference and Local Variables

Coding solution