3. Kotlin

  • 3.1. Kotlin tutorial

    Kotlin is a statically typed programming language that runs on the Java virtual machine, known as the Android world...
    2025-10-25 13:34:26 UTC
  • 3.2. Kotlin IntelliJ IDEA environment building

    Free community version of IntelliJ IDEA download address: https://www.jetbrains.com/idea/download/index.html After downl...
    2025-10-25 13:34:26 UTC
  • 3.3. Kotlin Eclipse environment building

    Eclipse through Marketplace to install Kotlin plug-in, open Eclipse, select Help-> Eclipse Marketplace… menus, ...
    2025-10-25 13:34:27 UTC
  • 3.4. Kotlin compiles using the command line

    Kotlin download address of command line compilation tool: JetBrains/kotlin , the latest is 1.1.2-2. You can choose t...
    2025-10-25 13:34:26 UTC
  • 3.5. Kotlin Android environment building

    3.5.1. Install the Kotlin plug-in # Android Studio will be installed built-in starting with version 3.0 (preview) K...
    2025-10-25 13:34:26 UTC
  • 3.6. Kotlin basic syntax

    Kotlin file to .kt is a suffix. 3.6.1. Package declaration # The code file usually begins with the declarat...
    2025-10-25 13:34:27 UTC
  • 3.7. Kotlin basic data type

    Kotlin basic numeric types of Byte , Short , Int , Long , Float , Double . Unlike Java, the char...
    2025-10-25 13:34:28 UTC
  • 3.8. Kotlin conditional control

    3.8.1. IF expression # One if statement contains a Boolean expression and one or more statements. // Tradition...
    2025-10-25 13:34:28 UTC
  • 3.9. Kotlin cycle control

    3.9.1. For cycle # for loop can provide an iterator for any iterator syntax isas follows: for (item in col...
    2025-10-25 13:34:28 UTC
  • 3.10. Kotlin classes and objects

    3.10.1. Class definition # Kotlin classes can contain constructors and initialization code blocks, functions, att...
    2025-10-25 13:34:27 UTC
  • 3.11. Kotlin inheritance

    Kotlin all classes in inherit the Any class, which is the superclass of all classes and the default superclass for c...
    2025-10-25 13:34:28 UTC
  • 3.12. Kotlin interface

    Kotlin interface is similar to Java 8, using the interface keyword defines the interface, allowing the method to hav...
    2025-10-25 13:34:28 UTC
  • 3.13. Kotlin extension

    Kotlin can extend the properties and methods of a class without inheriting or using Decorator mode. Extension is a...
    2025-10-25 13:34:29 UTC
  • 3.14. Kotlin data class and sealed class

    3.14.1. Data class # Kotlin can create a class that contains only data with the keyword data : data class ...
    2025-10-25 13:34:26 UTC
  • 3.15. Kotlin generics

    Generics, or “parameterized types”, parameterize types and can be used on classes, interfaces, and methods. Same as Java ...
    2025-10-25 13:34:28 UTC
  • 3.16. Kotlin enumerated class

    The most basic use of the enumeration class is to implement a type-safe enumeration. Enumeration constants are separated b...
    2025-10-25 13:34:26 UTC

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.