kotlin 中 lazy{} 与 getter() 初始化之间的区别

Question

In kotlin we can use both of these approach lazy{} and getter()

lazy initializaiton:

internal val connector by lazy {
        serviceConnector
    }

getter():

internal val connector : ServiceConnector
        get() = serviceConnector

When to use which approach and what actually does these two approach under the hood. Which one is best approach?

Answer 1

When you use the lazy delegate, the val is initialized only when you use it the first time. So, in your code, the first time you access connector , the code inside the lambda is run, and the result is assigned to the val .

get() , instead, is used to redefine what happens when you try to access the val .