带有示例的 Scala TreeSet count() 方法
在 Scala TreeSet class
中, count()方法用于计算 TreeSet 中满足给定谓词的元素的数量。
Method Definition: def count(p: (A) => Boolean): Int
Return Type: It returns the count the number of elements in the TreeSet that satisfies a given predicate.
示例 #1:
// Scala program of count()
// method
// Import TreeSet
import scala.collection.mutable._
// Creating object
object GfG
{
// Main method
def main(args:Array[String])
{
// Creating TreeSet
val t1 = TreeSet(2, 1, 3, 4, 5)
// Print the TreeSet
println(t1)
// Applying count() method
val result = t1.count(x => {x % 2 == 0})
// Display output
print("Number of even element in the TreeSet: " + result)
}
}
输出:
TreeSet(1, 2, 3, 4, 5)
Number of even element in the TreeSet: 2
示例 #2:
// Scala program of count()
// method
// Import TreeSet
import scala.collection.mutable._
// Creating object
object GfG
{
// Main method
def main(args:Array[String])
{
// Creating TreeSet
val t1 = TreeSet(2, 1, 3, 4, 5)
// Print the TreeSet
println(t1)
// Applying count() method
val result = t1.count(x => {x % 2 != 0})
// Display output
print("Number of odd element in the TreeSet: " + result)
}
}
输出:
TreeSet(1, 2, 3, 4, 5)
Number of odd element in the TreeSet: 3