In this tutorial you will learn about HashMap via simple step by step examples.
Example 1: HashMap
Let us look at a simple HashMap example written in Kotlin Programming Language. Follow the following steps:
Step 1: Create Project
- Open your favorite Kotlin IDE.
- In the menu go to
File --> Create New Project
.
Step 2: Add Dependencies
No dependencies are needed for this project.
Step 3: Write Code
Our code will comprise the following Kotlin files:
HashMap.kt
- In your editor or IDE, create a file known as
HashMap.kt
. - Then add the following code:
(a). HashMap.kt
package Collections.HashMaps
fun main(args : Array<String>) {
val dict = hashMapOf (
"adam" to "Illionis",
"bryan" to "Alabama",
"cain" to "Oklahoma"
)
println("Current location ${dict["adam"]}")
//this is called multi declaration where you assign the each pair key and value to separate variables
for ((k, v) in dict)
println("Key in $k has value $v")
for (k in dict.keys)
println("Key in '$k' with value '${dict[k]}'")
println("Looping using entrySet")
for (n in dict.entries)
println("Key ${n.key} with value ${n.value}")
}
Step 4: Run
Copy the code, build and run.
Reference
Here are the reference links:
Number | Link |
---|---|
1. | Download Example |
2. | Follow code author |
3. | Code: Apache 2.0 License |