Kotlin ArrayList: arrayListOf()

An arrayListOf() is a function of ArrayList class. ArrayList is mutable which means it provides both read am write functionalities. The arrayListOf() function returns an ArrayList type.

Syntax of arrayListOf() function

Function of Kotlin ArrayList

Kotlin arrayListOf() Example 1

Let's create a simple example of arrayListOf() function.

Output:

4
7
12

Kotlin arrayListOf() Example 2

For more specific we can define the generic types of arrayListOf() function such as arrayListOf<Int>(), arrqayListOf<String>(),arrayListOf<Any>(). Let's see the example.

Output:

print int ArrayList
1
2
3

print string ArrayList
Ajay
Vijay
Prakash

print any ArrayList
1
2
3
Ajay
Vijay
Prakash

Kotlin arrayListOf() Example 3- iterator() function

The elements of ArrayList class is also be traverse using inbuilt iterator() function. For example:

Output:

.......print ArrayList.......
Ajay
Vijay
Prakash

Kotlin arrayListOf() Example 4 - get()

The get() function of arrayListOf() is used to retrieve the element present at specified index. For example:

Output:

.......print list.......
Ajay
Vijay
Prakash
Rohan
Vijay
.......list.get(2).......
Prakash

Kotlin arrayListOf() Example 5 - set()

The set() function of arrayListOf() is used to set the given element at specified index and replace if any element already present at that index. For example:

Output:

.......print list.......
Ajay
Vijay
Prakash
.......list.set(2,"Rohan").......
.......print list.......
Ajay
Vijay
Rohan

Kotlin arrayListOf() Example - add and print Employee data

Let's create an another example of arrayListOf() function of ArrayList class. In this example we are adding and traversing Employee class data. Here Employee class is bean class which defines the property of Employee.

Output:

101 Ajay 55555 Delhi
102 Rahul 44443 Mumbai
103 Sanjay 45422 Noida