kotlin實現繼承

遺產 (Inheritance)

• Inheritance is a mechanism wherein a new class is derived from an existing class.

  繼承是一種機制，其中新類是從現有類派生的。

• All Kotlin Classes have a common Superclass 'Any', it is the Default Superclass with no Super Type declared.

  所有Kotlin類都有一個通用的超類“ Any”，它是沒有聲明任何超類型的默認超類。

  class Student // implicitly inherits from Any

• 'Any' Class has three methods

  “任何”課程有三種方法

• equals()
• hashCode()
• toString()

• By Default All class is Final in Kotlin, They can't be inherited.

  默認情況下，所有類在Kotlin中都是Final，不能繼承。

• Use 'open' keyword, to make class inheritable,

  使用“ open”關鍵字，使類可繼承，

  open class <class name> // make class inheritable

• To declare explicit supertype, placer base class name after colon into the class header.

  要聲明顯式超類，在冒號之后將放置器基類名稱放入類標題中。

  open class Base{} class Derived : Base{}

Kotlin繼承計劃 (Program for Inheritance in Kotlin)

package com.includehelp//Declare class, use 'open' keyword //to make class inheritable //Class without declare primary constructor open class Company{//member functionfun getCompany(){println("Base Methods : Company Info")} } //Declare class using inheritance class Department : Company() {//member functionfun getDept(){println("Derived Method : Dept Info")} }//Declare class, use 'open' keyword //to make class inheritable open class Shape(val a:Int){fun getBaseValue(){println("Base value : $a")} } //if derived class has primary constructor //then base class can initialized there //using primary constructor parameters class Circle(val b:Int): Shape(b) {fun getChildValue(){println("Child value : $b")} }//Main Function, Entry point of program fun main(args:Array<String>){//create derived class objectval company = Department()//access base class functioncompany.getCompany()//access derived class functioncompany.getDept()//create derived class object and passed parameterval shape = Circle(20)//access base class functionshape.getBaseValue()//access derived class functionshape.getChildValue() }

Output:

輸出：

Base Methods : Company Info Derived Method : Dept Info Base value : 20 Child value : 20

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

kotlin實現繼承

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