- 使用HashSet执行操作
是密封类。它扩展了不可变的Set和AbstractSet特征。哈希码用于存储元素。它既不对元素排序也不维护插入顺序。由HashSet类实现的Set接口, 由哈希表支持。在Scala中, 已知的HashSet是Set语义的具体实现。
语法如下：
var HashsetName = HashSet(element1, element2, element3, ....)使用HashSet执行操作初始化HashSet：
下面是创建或初始化HashSet的示例。
【数据结构（在Scala中的HashSet用法指南）】范例：
// Scala program of Initializing HashSet
import scala.collection.immutable.HashSet// Creating object
object GFG
{
// Main method
def main(args : Array[String])
{
println( "Initialize a HashSet" )// Creating HashSet
val hashSet : HashSet[String] = HashSet( "Geeks" , "lsbin" , "Author" )
println(s "Elements are = $hashSet" )
}
}输出如下：
Initialize a HashSet
Elements are = Set(Geeks, Author, lsbin)检查HashSet中的特定元素：
范例：
// Scala program of Check specific elements in HashSet
import scala.collection.immutable.HashSet// Creating object
object GFG
{
// Main method
def main(args : Array[String])
{
println( "Initialize a HashSet" )// Creating HashSet
val hashSet : HashSet[String] = HashSet( "Geeks" , "lsbin" , "Author" )
println(s "Elements are = $hashSet" )// Checking
println(s "Element Geeks = ${hashSet(" Geeks ")}" )
println(s "Element Student = ${hashSet(" Student ")}" )
}
}输出如下：
Initialize a HashSet
Elements are = Set(Geeks, Author, lsbin)
Element Geeks = true
Element Student = false在HashSet中添加元素：
我们可以使用+符号在HashSet中添加元素。以下是在HashSet中添加元素的示例。
范例：
// Scala program of adding an element in HashSet
import scala.collection.immutable.HashSet// Creating object
object GFG
{
// Main method
def main(args : Array[String])
{
println( "Initialize a HashSet" )// Creating HashSet
val hs : HashSet[String] = HashSet( "Geeks" , "lsbin" , "Author" )
println(s "Elements are = $hs" )// Adding an element in HashSet
val hs 1 : HashSet[String] = hs + "GeeksClasses"
println(s "Adding elements to HashSet = $hs1" )
}
}输出如下：
Initialize a HashSet
Elements are = Set(Geeks, Author, lsbin)
Adding elements to HashSet = Set(GeeksClasses, Geeks, Author, lsbin)在HashSet中添加多个元素：
我们可以使用++符号在HashSet中添加多个元素。以下是在HashSet中添加多个元素的示例。
范例：
// Scala program of adding more elements in HashSet
import scala.collection.immutable.HashSet// Creating object
object GFG
{
// Main method
def main(args : Array[String])
{
println( "Initialize a HashSet" )// Creating HashSet
val hs : HashSet[String] = HashSet( "Geeks" , "lsbin" , "Author" )
println(s "Elements are = $hs" )// Adding elements in HashSet
val hs 1 : HashSet[String] = hs ++ HashSet[String]( "Java" , "Scala" )
println(s "Add more than one HashSets = $hs1" )
}
}输出如下：
Initialize a HashSet
Elements are = Set(Geeks, Author, lsbin)
Add more than one HashSets = Set(Scala, Geeks, Author, Java, lsbin)删除HashSet中的元素：
我们可以使用–符号删除HashSet中的元素。以下是在HashSet中删除元素的示例。
范例：
// Scala program of removing element in HashSet
import scala.collection.immutable.HashSet// Creating object
object GFG
{
// Main method
def main(args : Array[String])
{
println( "Initialize a HashSet" )// Creating HashSet
val hs : HashSet[String] = HashSet( "Geeks" , "lsbin" , "Author" )
println(s "Elements are = $hs" )// removing elements in HashSet
val hs 1 : HashSet[String] = hs - "Geeks"
println(s "remove element from hashset = $hs1" )
}
}输出如下：
Initialize a HashSet
Elements are = Set(Geeks, Author, lsbin)
remove element from hashset = Set(Author, lsbin)找到两个HashSets之间的交集：
我们可以使用＆符号找到两个HashSet之间的交集。下面是查找两个HashSet之间的交集的示例。
范例：
// Scala program of finding the intersection between two HashSets
import scala.collection.immutable.HashSet// Creating object
object GFG
{
// Main method
def main(args : Array[String])
{
println( "Initialize two HashSets" )// Creating two HashSet
val hs : HashSet[String] = HashSet( "Geeks" , "lsbin" , "Author" )
println(s "Elements of hashset1 are = $hs" )val hs 1 : HashSet[String] = HashSet( "Java" , "Geeks" , "Scala" )
println(s "Elements of hashset2 are = $hs1" )// finding the intersection between two HashSets
println(s "Intersection of hashSet1 and hashSet2 = ${hs &
hs1}" )
}
}输出如下：
Initialize two HashSets
Elements of hashset1are = Set(Geeks, Author, lsbin)
Elements of hashset2 are = Set(Scala, Geeks, Java)
Intersection of hashSet1 and hashSet2 = Set(Geeks)初始化一个空的HashSet：
范例：
// Scala program ofInitializing an empty HashSet
import scala.collection.immutable.HashSet// Creating object
object GFG
{
// Main method
def main(args : Array[String])
{
// Initializing an empty HashSet
val emptyHashSet : HashSet[String] = HashSet.empty[String]
println(s "Empty HashSet = $emptyHashSet" )
}
}输出如下：
Empty HashSet = Set()推荐阅读
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