kotlin中既繼承又實現

繼承中的主要沖突 (Overriding Conflicts in Inheritance)

• It may appear, we inherit more than one implementation of the same method.

  看來，我們繼承了同一方法的多個實現。

• Need to implement all the methods which we have inherited from multiple interfaces.

  需要實現我們從多個接口繼承的所有方法。

解決Kotlin中繼承中的主要沖突 (Resolving Overriding Conflicts in Inheritance in Kotlin)

package com.includehelp
// declare interface
interface One{
// abstract function
fun myName()
// function with implementation
fun sayHello(){
println("Hello, 'From Interface One' ")
}
}
interface Two{
// function with implementation
fun sayHello(){
println("Hello, 'From Interface Two' ")
}
// function with implementation
fun myName(){
println("My Name is  Interface 'Two'")
}
}
// class implementing interface
class Three:One{
// override interface abstract method
override fun myName() {
println("My Name is Class Three")
}
}
// class implementing more then one interfaces
class Four:One,Two{
// need to implement all the methods 
// which we have inherited from multiple interfaces
override fun sayHello() {
// Both interface have sayHello implementation in interfaces,
// so explicitly define Interface name in super to call, 
// specific implementation from class
super<One>.sayHello()
super<Two>.sayHello()
println("Hello, From Class 'Four' ")
}
// need to implement all the methods 
// which we have inherited from multiple interfaces
override fun myName() {
// called super type implementation of method,
// only interface two have implementation of this method, 
// so need to explicitly define interface name
super.myName()
println("My Name is Class Four")
}
}
// Main function, Entry point of program
fun main(){
// create class instance
val four = Four()
// call methods
four.myName()
// call methods
four.sayHello()
}

Output:

輸出：

My Name is  Interface 'Two'
My Name is Class Four
Hello, 'From Interface One' 
Hello, 'From Interface Two' 
Hello, From Class 'Four'

翻譯自: https://www.includehelp.com/kotlin/example-of-resolving-overriding-conflicts-in-inheritance.aspx

kotlin中既繼承又實現