Gain insights into Java programming by exploring conditional statements, loops, math, logic, inheritance, generics, and arraylists, to become an intermediate Java developer.

Learn Java for free with this interactive course, 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.

By the time you're done, you'll be an intermediate level Java developer, ready to take on your own projects.

Learn Intermediate Java

# Solution: To be upper case or not to be?

class challenge_four {
    public static String test(String x) {

        if (x.length() % 2 == 0) {
            return x.toUpperCase();
        }

        return x.toLowerCase();
    }
    public static void main( String args[] ) {
        String odd = "Hello";
        String even = "John";
        System.out.println( "Hello:" + test(odd));
        System.out.println( "John:" + test(even));
    }
}

# Understanding the code
$$$$

* **Line 4:** The **if condition** first finds the length of the input String. This is done by using the method, `x.length()`. Then it checks whether the length, when **divided by 2** gives a zero remainder or not. Given that the **remainder** is `0`, the input variable, `x` is **even** so *line 5* will be executed. If not, then jump to *line 8*. 

* **Line 5:** `returns` the `upper case` String `x`. 
* **Line 8:** Provided this **if** condition is not met, on **line 4** the `lower case` version of String `x` is **returned**.

In this review, solution of the challenge 'Playing With Strings' 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: Playing With Strings

Solution: