```java
Map<String, List> map =
if (map.get("good") == null) {
} else {
}
Optional(map.get("good"))
.map()
.orElse()
```
```java
WrapperInfoProxy res = wrapperInfoProxyList.stream()
.filter(wrapperInfoProxy -> StringUtils.equals(wrapperInfoProxy.getWrapperId(), codebase))
.findFirst()
.orElseGet(WrapperInfoProxy::new);
```