kotlin獲取屬性

屬性獲取器和設置器方法 (Properties Getter and Setter Methods)

• Variable having a class-level scope, declared inside the class body but outside the functions called property.

  具有類級別范圍的變量，在類主體內部但在稱為屬性的函數(shù)外部聲明。

• Property can be declared with var(mutable) and val (read-only).

  可以使用var(mutable)和val(只讀)聲明屬性。

  var/val <propertyName>: <PropertyType> = <property_initializer> [<getter>] [<setter>]

• property_initializer, getter, and Setter are optional.

  property_initializer，getter和Setter是可選的。

• Getter and Setter Auto-Generated into the code.

  Getter和Setter自動生成到代碼中。

• Getter is used to get the value of properties and setter is used to set value of properties.

  Getter用于獲取屬性值，而setter用于設置屬性值。

• val(read-only) type property does not allow setter.

  val(只讀)類型屬性不允許使用setter。

• If we don't want public access of setter than declare it private.

  如果我們不希望公開訪問setter，則將其聲明為私有。

  var name:String private set

程序以演示Kotlin中的屬性Getter和Setter方法的示例 (Program to demonstrate the example of Properties Getter and Setter Methods in Kotlin)

package com.includehelp// Declare class, class America{// Declare property with initial valuevar city:String = "NewYork"// Auto Generated getter and setter }// Declare class, class India{// Declare property with initial valuevar city:String = "Delhi"// define optional getter and setterget() = field // Getterset(value) { // Setterfield=value} }// Declare class, define optional getter and setter class China{// Declare property with initial valuevar city:String = "Wuhan"// private setter, cant set value from outside the classprivate set// member function to set propertyfun setCity(city:String){this.city=city}}// declare class, with customized getter and setter class Japan{// Declare property with initial valuevar city:String = "Tokyo"// Getter of propertyget() = field.toUpperCase()//setter of Propertyset(value) {field="Modern City $value"} }// Main function, entry Point of Program fun main(){// create Instanceval america=America()america.city="Alsakaaa" // access setterprintln("America : ${america.city}") // access getter// create Instanceval india=India()india.city="Mumbai" // access setterprintln("India : ${india.city}") // access getter// create Instanceval china=China()// Try to access private setter, leads to compile time error// china.city="Beijing"// Set City by calling member functionchina.setCity("Beijing")println("China : ${china.city}") // access getter// create Instanceval japan=Japan()india.city="Quoto" // access setterprintln("Japan : ${india.city}") // access getter }

Output:

輸出：

America : Alsakaaa India : Mumbai China : Beijing Japan : Quoto

翻譯自: https://www.includehelp.com/kotlin/example-of-properties-getter-and-setter-methods.aspx

kotlin獲取屬性

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