AkshayChordiya

// Using R.layout.activity_main
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
         // Instead of findView(R.id.toolbar) as Toolbar
        setSupportActionBar(toolbar)

AkshayChordiya

public class ViewModelStore {
    private final HashMap<String, ViewModel> mMap = new HashMap();

    public ViewModelStore() {}

    final void put(String key, ViewModel viewModel) {
        ViewModel oldViewModel = (ViewModel)this.mMap.get(key);
        if(oldViewModel != null) {
            oldViewModel.onCleared();
        }

AkshayChordiya

class SimpleViewModel() : ViewModel() {

    /**
     * The data
     */
    private var data: List<Data>

    init {
        // Load the data over here
        // data = ....

AkshayChordiya

class ContextViewModel(application: Application) : AndroidViewModel(application) {

    /**
     * The data
     */
    private var data: List<Data>

    init {
        // Load the data over here
        // data = ....

AkshayChordiya

class MainActivity : LifecycleActivity() {
    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // Get the ViewModel instance
        val simpleViewModel = ViewModelProviders.of(this).get(SimpleViewModel::class.java)       
        val data = simpleViewModel.getDataList()
    }

AkshayChordiya

 val executionTime = measureTimeMillis {
    // Do your task
}
println("Execution Time = $executionTime ms")

AkshayChordiya

Person person = new Person();
person.setName("Tony Stark");
person.setAge(52);
// More such stuff

AkshayChordiya

FileReader("input.txt").use {
        // Read the file
}
// Automatically closed

AkshayChordiya

try (FileReader reader = new FileReader("input.txt")) {
    // Read the file
} catch (IOException e) {
    e.printStackTrace();
}
// Automatically closed

AkshayChordiya

val person = Person().also {
  it.name = "Tony Stark"
  it.age = 52
  // More such stuff
}