soudmaijer

val orderOrElse: Order = orderById?.apply {
    // do stuff with order
} ?: Order() // orElse with default

val orderOrElseThrow: Order = orderById?.apply {
    // do stuff with order
} ?: throw RuntimeException("orElseThrow") // orElseThrow

val orderId: Long? = orderById?.let {
    // do stuff with order

soudmaijer

fun doStuffWithOrder(id: Long) {
    val orderById: Order? = orderRepository.findOrderById(id)

    orderById?.run {
        // do stuff with order
    }

    orderById.id // Compiler error: Only safe ?. or non-null asserted calls are allowed on a nullable receiver of type Order?
}

soudmaijer

public void doStuffWithOrder(Long id) {
    Optional<Order> orderById = orderRepository.findOrderById(id);

    orderById.ifPresent( order -> {
        // do stuff with order
    });
}

soudmaijer

import org.springframework.jdbc.core.JdbcTemplate
import org.springframework.jdbc.core.RowMapper
import org.springframework.stereotype.Repository

@Repository
class OrderRepository(private val jdbcTemplate: JdbcTemplate) {
    private val rowMapper: RowMapper<Order> = RowMapper { rs, i -> Order(rs.getLong("id")) }

    fun findOrderById(id: Long): Order? {
        val result = jdbcTemplate.query<Order>("select * from orders where id=:id", rowMapper, id)

soudmaijer

import org.springframework.jdbc.core.JdbcTemplate
import org.springframework.jdbc.core.RowMapper
import org.springframework.stereotype.Repository
import java.util.*

@Repository
class OrderRepository(private val jdbcTemplate: JdbcTemplate) {
    private val rowMapper: RowMapper<Order> = RowMapper { rs, i -> Order(rs.getLong("id")) }

    fun findOrderById(id: Long): Optional<Order> {

soudmaijer

import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Repository;

import java.util.List;
import java.util.Optional;

@Repository
public class OrderRepository {
    private static final RowMapper<Order> rowMapper = (rs, i) -> new Order(rs.getLong("id"));

soudmaijer

@RunWith(JMockit::class)
class AddressBookTestKt {

    @Injectable
    private lateinit var addressBookRepository: AddressBookRepository
    @Tested
    private lateinit var addressBook: AddressBook

    @Test
    fun retrieveAddressByIdTest() {

soudmaijer

inline fun expectations(crossinline block: KExpectations.() -> Unit) {
    object : KExpectations() {
        init {
            block()
        }
    }
}

inline fun verifications(crossinline block: KVerifications.() -> Unit) {
    object : KVerifications() {

soudmaijer

expectations {
   // Instruct mocks
}

soudmaijer

object : Expectations() {
    init {
        // Instruct mocks
    }
}