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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.

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class HelloWorld {
    public static void main( String args[] ) {
        int x =3;
        String answer = "";
        switch (x) {
            case 1:
                answer = "Monday";
                break;
            case 2:
                answer = "Tuesday";
                break;
            case 3:
                answer = "Wednesday";
                break;
            case 4:
                answer = "Thursday";
                break;
            case 5:
                answer = "Friday";
                break;
            case 6:
                answer = "Saturday";
                break;
            case 7:
                answer = "Sunday";
                break;
            default:
                answer = "invalid input";
        }
        System.out.println(answer);
    }
}

# Understanding the code

**1. Line 5:** <br>
 * The `switch` statement is used. This switch statement will take the variable `x` in its input. 

**2. Line 6-8:**<br>
* The first `case` is written. 
* This states that if the **value of x** is **1**, then set `answer` to the String, **Monday**. 
* We used the `break` statement to come out of the `switch` block immediately.

**3. Line 9-26:**<br>

* Similarly, we have written the cases to the set value of `answer` for the rest of the values of x (2 to 7).

**4. Line 27-28:**<br>
* We have to cater the case when the value of the day number is invalid.

* This is the **default case** in which we have simply set the `answer` to **invalid input**, as is specified in the problem statement.

In this review, the solution of the challenge What Day Is It? from the previous lesson is provided.

Getting Started with Java!

Variables & User Input

Simple Maths & Logic

Strings and String Processing

Conditional Statements

Loops

Methods

Arrays

Classes and Inheritance

Generics

ArrayLists

Java Exam

Solution Review: What Day Is It?

Solution: