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public interface OnClickListener {
    void onClick(View v);
}

button.setOnClickListener(new OnClickListener() {
  public void onClick(View v) {
    //handle click
  }
 });

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protocol Grinder {
    func grind(_ coffee: Coffee)
}
class GrinderMock: Grinder {
    private(set) var timesUsed: Int = 0
    func grind(_ coffee: Coffee) {
        timesUsed += 1
    }
}
class CoffeeMakerTest: XCTestCase {

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protocol Shakeable {
    func shake()
}

extension Shakeable where Self: UIView {
    func shake() {
        UIView.animate(...
    }
}

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interface ToastShowable {
    fun showToast(context: Context, text: String) = ...
}
class MainActivity : ComponentActivity(), ToastShowable {

    override fun onCreate(savedInstanceState: Bundle?) {
        //...
        showToast(this, "Le toast")
    }
}

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interface Message {
    val timestamp: DateTime
}

class TextMessage(
    val text: String,
    override val timestamp: DateTime
) : Message

class ImgMessage(

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import android.text.Annotation
import android.text.SpannedString
import androidx.annotation.StringRes
import androidx.compose.runtime.Composable
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.text.AnnotatedString
import androidx.compose.ui.text.SpanStyle
import androidx.core.text.getSpans

@Composable

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/**
 * Sets the result to be obtained by [NavResultCallback] attached to [targetBackStackEntry]
 */
abstract class NavResultPusher<T>(
    private val targetBackStackEntry: NavBackStackEntry,
    private val key: String
) {
    open fun setResult(result: T) = targetBackStackEntry.savedStateHandle.set(key, result)
}

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/*
 * Copyright 2020 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software

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private data class Border(val strokeWidth: Dp, val cornerRadius: Dp, val color: Color)

fun Modifier.bookCardBackground(
    itemIndex: Int,
    allItemsSize: Int
): Modifier {

    val border = Border(
        strokeWidth = 1.dp,
        cornerRadius = 16.dp,

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createPublisher(wrapper: observeUsersUseCase.observeUsers(usersCount: 5))
    .zip(createPublisher(wrapper: observeUsersUseCase.observeUsers(usersCount: 5)))
    .sink(
        receiveCompletion: { _ in },
        receiveValue: { user in
            let user1 = user.0!.name
            let user2 = user.1!.name
            print("Date between \(user1) and \(user2)")
        }
    )