The **```kotlin.collections``` package** contains all collection types, such as ```Map```, ```List```, ```Set```, etc., and is part of Kotlin's standard library.

The package provides the **```ArrayList``` class** which is a mutable list and uses a dynamic resizable array as the backing storage.

#    
## The `add()` method
The `ArrayList` class contains the **`add(E)` method** which adds the specified input element to the end of the list.

## Syntax
```
fun add(element: E): Boolean
```

## Arguments 
- This method takes an element of type `E` as input and adds it to the end of the list.

## Return value
- It returns `true` as the list is modified as the result of the add operation.

## Things to note
- `ArrayList` follows the sequence of insertion of the elements.

- It is allowed to contain duplicate elements.

## Code
The ```ArrayList``` class is present in the ```kotlin.collection``` package and is imported by default in every Kotlin program.

fun main(args : Array<String>) {
    val companyList = ArrayList<String>()
    
    companyList.add("Facebook")
    companyList.add("Amazon")  
    companyList.add("Apple")  
    companyList.add("Netflix")  
    companyList.add("Google")

    println("Printing ArrayList elements--")  
    print(companyList)  
}

## Explanation
- First, we create an empty ```ArrayList``` to store strings.

- Next, we add a few company names to the ```ArrayList``` object, ```"Facebook"```, ```"Amazon"```, ```"Apple"```,  ```"Netflix"```, and ```"Google"``` using the ```add()``` method.
- All the elements added above are displayed using the ```print()``` function of the ```kotlin.io``` package.



What is the ArrayList.add() method in Kotlin?

The `add()` method in Kotlin's `ArrayList` appends an element to the list, returns true, and allows duplicates.

What is the ArrayList.add() method in Kotlin?

The add() method

Syntax

Arguments

Return value

Things to note

Code

Explanation

The `add()` method