8.27. Scala string

发布时间 :2023-11-16 23:00:02 UTC      

The following example assigns a string to a constant:

8.27.1. Example #

object Test {
   val greeting: String = "Hello,World!"
   def main(args: Array[String]) {
      println( greeting )
   }
}

The above example defines the variable greeting is a string constant oftype String(java.lang.String) .

In Scala, the type of string is actually Java String , it doesn’t have its own String class.

In Scala String is an immutable object, so the object cannot be modified. This means that if you modify the string, a new string object willbe generated.

But other objects, such as arrays, are mutable objects. Next, we will introduce to you the commonly used ones java.lang.String method.

Principles, Technologies, and Methods of Geographic Information Systems  102

In recent years, Geographic Information Systems (GIS) have undergone rapid development in both theoretical and practical dimensions. GIS has been widely applied for modeling and decision-making support across various fields such as urban management, regional planning, and environmental remediation, establishing geographic information as a vital component of the information era. The introduction of the “Digital Earth” concept has further accelerated the advancement of GIS, which serves as its technical foundation. Concurrently, scholars have been dedicated to theoretical research in areas like spatial cognition, spatial data uncertainty, and the formalization of spatial relationships. This reflects the dual nature of GIS as both an applied technology and an academic discipline, with the two aspects forming a mutually reinforcing cycle of progress.