Queue/Definition: Difference between revisions
Added Kotlin
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ERROR: queue must be non-empty
in pop! at none:2
</pre>
=={{header|Kotlin}}==
<lang scala>// version 1.1.1
import java.util.LinkedList
class Queue<E> {
private val data = LinkedList<E>()
val size get() = data.size
val empty get() = size == 0
fun push(element: E) = data.add(element)
fun pop(): E {
if (empty) throw RuntimeException("Can't pop elements from an empty queue")
return data.removeFirst()
}
val top: E
get() {
if (empty) throw RuntimeException("Empty queue can't have a top element")
return data.first()
}
fun clear() = data.clear()
override fun toString() = data.toString()
}
fun main(args: Array<String>) {
val q = Queue<Int>()
(1..5).forEach { q.push(it) }
println(q)
println("Size of queue = ${q.size}")
print("Popping: ")
(1..3).forEach { print("${q.pop()} ") }
println("\nRemaining in queue: $q")
println("Top element is now ${q.top}")
q.clear()
println("After clearing, queue is ${if(q.empty) "empty" else "not empty"}")
try {
q.pop()
}
catch (e: Exception) {
println(e.message)
}
}</lang>
{{out}}
<pre>
[1, 2, 3, 4, 5]
Size of queue = 5
Popping: 1 2 3
Remaining in queue: [4, 5]
Top element is now 4
After clearing, queue is empty
Can't pop elements from an empty queue
</pre>
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