Scala List contains() 方法和示例

contains()方法用于检查某个元素是否存在于列表中。

Method Definition: def contains(elem: Any): Boolean

Return Type: It returns true if the element present in the contains method as argument is also present in the stated list else it returns false.

示例 #1：

// Scala program of contains()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a list
        val m1 = List(1, 3, 5, 2)
          
        // Applying contains method
        val res = m1.contains(1)
          
        // Displays output
        println(res)
      
    }
}

输出：

true

示例 #2：

// Scala program of contains()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a list
        val m1 = List(1, 3, 5, 2)
          
        // Applying contains method
        val res = m1.contains(7)
          
        // Displays output
        println(res)
      
    }
}

输出：

false