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[fix]枚举那篇文章的EnumMap的groupPizzaByStatus方法有问题

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guide 2020-08-23 11:10:05 +08:00
parent df3cbb65dc
commit 733193324f
1 changed files with 10 additions and 15 deletions
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13
docs/java/basic/用好Java中的枚举真的没有那么简单.md
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@ -257,23 +257,18 @@ EnumMap<Pizza.PizzaStatus, Pizza> map;
让我们快速看一个真实的示例，该示例演示如何在实践中使用它：
```java
public static EnumMap<PizzaStatus, List<Pizza>>
groupPizzaByStatus(List<Pizza> pizzaList) {
EnumMap<PizzaStatus, List<Pizza>> pzByStatus =
new EnumMap<PizzaStatus, List<Pizza>>(PizzaStatus.class);
for (Pizza pz : pizzaList) {
Iterator<Pizza> iterator = pizzaList.iterator();
while (iterator.hasNext()) {
Pizza pz = iterator.next();
PizzaStatus status = pz.getStatus();
if (pzByStatus.containsKey(status)) {
pzByStatus.get(status).add(pz);
} else {
List<Pizza> newPzList = new ArrayList<Pizza>();
List<Pizza> newPzList = new ArrayList<>();
newPzList.add(pz);
pzByStatus.put(status, newPzList);
}
}
return pzByStatus;
}
```
下面的测试演示了展示了 `EnumMap` 在某些场景下的强大功能：