[Kotlin] companion object == static method
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In Kotlin, there is no static methods, but we can use companion object which works the same as static methods.
For example, a class:
package
com.rsk
import
java.security.Provider
import
java.security.Security
class
Providers {
//
similar as static
companion object {
fun getProviders(): List<Provider> {
val providers = Security.getProviders();
val listOfProviders: List<Provider> = providers.asList()
return listOfProviders
}
}
fun getProviders(): List<Provider> {
val providers = Security.getProviders();
val listOfProviders: List<Provider> = providers.asList()
return listOfProviders
}
}
You notice there are two functions called ‘getProviders‘, the first one is inside companion object.
The companion is singelton.
Usage:
val providers = Security.getProviders();
For the second ‘getProviders‘, usage:
val providers = Providers()
val allProviders = providers.getAllProviders()
As you can see, using companion object is musch cleaner way to write the code
原文：https://www.cnblogs.com/Answer1215/p/13822202.html
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