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BAEL-4312: Add Java Stream example (#9559)

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kwoyke 2020-06-27 18:05:37 +02:00 committed by GitHub
parent 6c921b3558
commit ef41e8caa1
2 changed files with 28 additions and 10 deletions
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7
core-java-modules/core-java-lang-2/src/main/java/com/baeldung/inttoenum/PizzaStatus.java
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@ -21,11 +21,10 @@ public enum PizzaStatus {
private static Map<Integer, PizzaStatus> timeToDeliveryToEnumValuesMapping = new HashMap<>();
static {
PizzaStatus[] pizzaStatuses = PizzaStatus.values();
for (int pizzaStatusIndex = 0; pizzaStatusIndex < pizzaStatuses.length; pizzaStatusIndex++) {
for (PizzaStatus pizzaStatus : PizzaStatus.values()) {
timeToDeliveryToEnumValuesMapping.put(
pizzaStatuses[pizzaStatusIndex].getTimeToDelivery(),
pizzaStatuses[pizzaStatusIndex]
pizzaStatus.getTimeToDelivery(),
pizzaStatus
);
}
}

31
core-java-modules/core-java-lang-2/src/test/java/com/baeldung/inttoenum/IntToEnumUnitTest.java
View File

@ -1,7 +1,12 @@
package com.baeldung.inttoenum;
import org.assertj.core.api.Assertions;
import org.junit.Test;
import java.util.Arrays;
import java.util.Optional;
import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.Assert.assertEquals;
public class IntToEnumUnitTest {
@ -9,19 +14,33 @@ public class IntToEnumUnitTest {
@Test
public void whenIntToEnumUsingValuesMethod_thenReturnEnumObject() {
int timeToDeliveryForOrderedPizzaStatus = 5;
PizzaStatus[] pizzaStatuses = PizzaStatus.values();
PizzaStatus pizzaOrderedStatus = null;
for (int pizzaStatusIndex = 0; pizzaStatusIndex < pizzaStatuses.length; pizzaStatusIndex++) {
if (pizzaStatuses[pizzaStatusIndex].getTimeToDelivery() == timeToDeliveryForOrderedPizzaStatus) {
pizzaOrderedStatus = pizzaStatuses[pizzaStatusIndex];
for (PizzaStatus pizzaStatus : PizzaStatus.values()) {
if (pizzaStatus.getTimeToDelivery() == timeToDeliveryForOrderedPizzaStatus) {
pizzaOrderedStatus = pizzaStatus;
}
}
assertEquals(pizzaOrderedStatus, PizzaStatus.ORDERED);
assertThat(pizzaOrderedStatus).isEqualTo(PizzaStatus.ORDERED);
}
@Test
public void whenIntToEnumUsingMap_thenReturnEnumObject() {
int timeToDeliveryForOrderedPizzaStatus = 5;
assertEquals(PizzaStatus.castIntToEnum(timeToDeliveryForOrderedPizzaStatus), PizzaStatus.ORDERED);
assertThat(PizzaStatus.castIntToEnum(timeToDeliveryForOrderedPizzaStatus)).isEqualTo(PizzaStatus.ORDERED);
}
@Test
public void whenIntToEnumUsingStream_thenReturnEnumObject() {
int timeToDeliveryForOrderedPizzaStatus = 5;
Optional<PizzaStatus> pizzaStatus = Arrays.stream(PizzaStatus.values())
.filter(p -> p.getTimeToDelivery() == timeToDeliveryForOrderedPizzaStatus)
.findFirst();
assertThat(pizzaStatus).hasValue(PizzaStatus.ORDERED);
}
}