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Java

Java is a high-level, object-oriented language known for its portability and reliability. Mastering Java is key for developers to build scalable, secure software efficiently.

In this course, you will start by mastering the art of problem-solving with simple Java programs, such as the Bottle Filling example. You will learn how to structure your solutions, create execution sheets, and enhance your problem-solving abilities through practical exercises and quizzes. Progressing further, you will learn decision-making and branching in Java, understanding flowcharts, conditional expressions, and their application. You will also learn about Java basics, including the first Java program, fundamentals, conditional statements, and error categories, followed by in-depth lessons on working with Java strings and arrays. 

By the end of this course, you will have a solid understanding of Java programming fundamentals and the ability to solve real-world problems using Java.

Learn to Code: Java for Absolute Beginners

# Task
This task requires you to find the index of the first outlier in a given array. All numbers in an array are in an arithmetic sequence, except one number. 


Write a program that uses an array and finds the index of the first outlier and stores it to the variable `idx`. The array is guaranteed to have at least $5$ elements and the first two elements will be in the required arithmetic sequence. The value of the `idx` should be $−1$ if the array has no outlier, and should be $0$ if the array length is less than $5$.


 
---

## Sample input 1
```t
array1 = {5,8,11,13,17}
```
## The resulting value 1
```t
idx = 3
```
## Expected output 1
```t
The outlier value is at the index: 3
```
---
## Sample input 2
```t
array1 = {1,6,11,16,20}
```
## The resulting value 2
```t
idx = 4
```
## Expected output 2
```t
The outlier value is at the index: 4
```
---
## Sample input 3
```t
array1 = {1,6,11}
```
## The resulting value 3
```t
idx = 0
```
## Expected output 3
```t
The array contains less than 5 elements
```
---
## Sample input 4
```t
array1 = {2,4,6,8,10}
```
## The resulting value 4
```t
idx = -1
```
## Expected output 4
```t
There is no outlier in the array
```
---
## How to test your program

When you click the "Test" button of the code widget, you get two options, as explained below:

* **Show Results:** It shows the sample inputs and their respective results in comparison with the expected output. The actual output is the outlier index calculated to display the results. The word "Succeeded" in the last column indicates that the calculated output matches the expected output. For example, if `array1` is `{5,8,11,13,17}` and the `idx` is `3`, then the last column shows "Succeeded". Similarly, if `array1` is `{2,4,6,8,10}` and the `idx` is `-1`, then the last column shows "Succeeded".

* **Show Console:** It shows the output from the `System.out.println()` statements used in your code. You may use this to verify your calculations on the basis of sample test inputs. For example, if `array1` is `{5,8,11,13,17}`, then the output on the console should be `The outlier value is at the index: 3.`. Similarly, if `array1` is `{2,4,6,8,10}`, then the output on the console should be `There is no outlier in the array`.






> **Note:** You don't have to worry about the `static` keyword. For testing purposes, we have removed the word `static` from the `public void main (String[] args)`. The lines in the solution are added because we have to declare variables using `UserValues`.

Find the index of an outlier in an arithmetic sequence.

About the Course

Problem Solving with Simple Programs

Decisions and Branching

Java Basics

Repetition with Loops

Strings and Arrays

Methods

Appendix - Complex Programs

Wrap Up

Challenge: Arithmetic Sequence

Task