Sealed Class Learning

Employee.kt

package com.example.coroutinelearning.entity

sealed class Employee //there is no need of {}, its optional
//if you use {}, u have to call class with use of Employee class, like Employee.Manager from fragment/activity. else u will be
//able to directly call it.
data class Manager(val name: String, val age: Int, val team: List<String>) : Employee()
class SeniorDev(val name: String, val age: Int, val project: String) : Employee()
object JuniorDev : Employee()

sealed_learning.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/btnEmployee"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:layout_marginTop="24dp"
        android:layout_marginEnd="32dp"
        android:text="btnEmployee"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btnManager"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:layout_marginTop="24dp"
        android:layout_marginEnd="32dp"
        android:text="Manager"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnEmployee" />

    <Button
        android:id="@+id/btnJuniorDev"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:layout_marginTop="24dp"
        android:layout_marginEnd="32dp"
        android:text="Junior Dev"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnManager" />
</androidx.constraintlayout.widget.ConstraintLayout>

SealedLearningFrag.kt

package com.example.coroutinelearning.fragments

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Toast
import androidx.fragment.app.Fragment
import com.example.coroutinelearning.databinding.SealedLearningBinding
import com.example.coroutinelearning.entity.Employee
import com.example.coroutinelearning.entity.JuniorDev
import com.example.coroutinelearning.entity.Manager
import com.example.coroutinelearning.entity.SeniorDev

class SealedLearningFrag: Fragment(), View.OnClickListener{

    private val TAG = SealedLearningFrag::class.simpleName

    private lateinit var binding: SealedLearningBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        binding = SealedLearningBinding.inflate(inflater, container, false)
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        binding.btnEmployee.setOnClickListener(this)
        binding.btnManager.setOnClickListener(this)
        binding.btnJuniorDev.setOnClickListener(this)
    }


    override fun onClick(view: View?) {
        when(view){
            binding.btnEmployee ->{
                val employee: Employee = SeniorDev("Amit", 32, "android")
                employeeMessage(employee)
            }
            binding.btnManager ->{
                val employee: Employee = Manager("Sonali", 34, listOf("apple", "android"))
                employeeMessage(employee)
            }
            binding.btnJuniorDev -> {
                val employee: Employee = JuniorDev
                employeeMessage(employee)
            }
            else -> {
                Toast.makeText(requireContext(), "nothing selected", Toast.LENGTH_SHORT).show()
            }
        }
    }

    private fun employeeMessage(employee: Employee) {

        val message = when(employee){
            is Manager -> {
                "Welcome ${employee.name}, your age: ${employee.age} to office"
            }
            is SeniorDev -> {
                "Welcome ${employee.name}, your age: ${employee.age} to office"
            }
            is JuniorDev -> {
                "Welcome onBoard, we wish you an awesome experience"
            }
            //no else is required, as all cases are handled here.
        }
        Toast.makeText(requireContext(), message, Toast.LENGTH_SHORT).show()
    }
}