kotlin 覆蓋屬性

方法重載 (Method Overriding)

• Method overriding allows derived class has the same function name and signature as the base class

  方法重寫允許派生類具有與基類相同的函數名稱和簽名

• By method overriding we can provide different implementation into the derived class of base class methods.

  通過方法重寫，我們可以為基類方法的派生類提供不同的實現。

• By default method is final in Kotlin class, to make them overridable declare the method with 'open'

  默認情況下，方法在Kotlin類中是final，要使其可重寫，請使用“ open”聲明該方法

• The open modifier does not affect when added on members of a final class (i.e.. a class with no open modifier).

  當將open修飾符添加到最終類的成員(即沒有open修飾符的類)的成員上時，則不受影響。

• Marked function with 'override' into derived class while overriding the base class method.

  在覆蓋基類方法的同時，將具有“覆蓋”功能的標記為派生類。

• Use 'super' to call the base class implementation of the method from child class

  使用“ super”從子類中調用方法的基類實現

Kotlin中的方法重寫程序 (Program for method overriding in Kotlin)

package com.includehelp//Declare Base class, //marked with 'open' to make inheritable open class Person{//marked function with 'open' to make//overridableopen fun printMessage(){println("Message for Person")} }//Derived class extends Person class class Child: Person() {//Override base class methodsoverride fun printMessage(){println("Message for Child")} }//marked derived class with 'open' //to make further inheritable by its //child class open class Boy : Person(){//A member marked override is itself open, //i.e. it may be overridden in subclasses.//If you want to prohibit re-overriding, use finalfinal override fun printMessage(){println("Message for Boys")} }//Derived class class Hero : Boy() {//Declare member functionfun printData(){//calling , Boy Class Implementation //of printMessage() functionsuper.printMessage()println("Hello Hero")} }fun main(args:Array<String>){//Create Person class Instance and Called Methods, //it will invoke Base class version of methodsPerson().printMessage()//Create class Instance and Called Methods,//it will invoke Child class version of methodsChild().printMessage()//Create class Instance and Called MethodsHero().printData() }

Output:

輸出：

Message for Person Message for Child Message for Boys Hello Hero

翻譯自: https://www.includehelp.com/kotlin/example-of-method-overriding.aspx

kotlin 覆蓋屬性

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