Sottti

{...}

import android.app.Fragment;
import android.app.FragmentTransaction;
import android.content.Context;
import android.content.Intent;
import android.graphics.PorterDuff;
import android.os.Bundle;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;

Sottti

// OverridenFromAnotherFile.kt

// Error: getAge() is not visible because is protected
val userAge = User().getAge()

// Error: getAge() is not visible because inherits the protected modifier
val moderatorAge = Moderator().getAge()

// getAge() is visible because the modifier is declared explicitly as public
val staffAge = Staff().getAge()

Sottti

// Overridden.kt

public open class User {
    protected open fun getAge() = 16
}

public class Moderator : User() {
  // getAge() inherits the protected modifier as default
    override fun getAge() = 18
}

Sottti

// User is public
// The User primary constructor is private
class User private constructor(id : Int) {
  // ...
}

// Moderator is internal
// The Moderator primary constructor is private
internal Moderator private constructor(id : Int) {
  // ...

Sottti

open class User(val userId: Int, val userName: String)
class Editor(userId: Int, userName: String, val rank: Int) : User(userId, userName)
class Moderator(userId: Int, userName: String, val type: Int) : User(userId, userName)
class Staff(userId: Int, userName: String, val department: String) : User(userId, userName)

Sottti

// Public.kt file

// Visible everywhere
public const val numberThree = 3

// Visible everywhere
public open class User() {
    // Visible to everyone with visibility on the User class
    public val numberEight = numberThree.plus(5)
}

Sottti

// Internal.kt file

// Visible to everyone in the same module
internal const val numberThree = 3

// Visible to everyone in the same module
internal open class User() {
    // Visible to everyone in the same module that has visibility on User
    internal val numberEight = numberThree.plus(5)
}

Sottti

// AnotherFile.kt file

// numberThree is visible to any other file because it's public
// numberEight is visible to any other file because User and numberEight are public
// numberEleven is visible to any other file because Moderator and numberEleven are public
private const val numberTwentyTwo = numberThree + User().numberEight + Moderator().numberEleven

Sottti

// Protected.kt file

// Visible inside this file
private const val numberThree = 3

// Visible inside this file
private open class User() {
    // Visible inside the User class and subclasses
    protected val numberEight = numberThree.plus(5)
}

Sottti

// SameModule.kt file

// numberThree is visible because this file is in the same module than Internal.kt
// numberEight is visible because this file is in the same module than User
private const val numberEleven = numberThree.plus(User().numberEight)