SONAR:用方法引用替换此 lambda
SONAR: Replace this lambda with a method reference
声纳告诉我"Replace this lambda with a method reference"
public class MyClass {
private List<SomeValue> createSomeValues(List<Anything> anyList) {
return anyList //
.stream() //
.map(anything -> createSomeValue(anything)) //
.collect(Collectors.toList());
}
private SomeValue createSomeValue(Anything anything) {
StatusId statusId = statusId.fromId(anything.getStatus().getStatusId());
return new SomeValue(anything.getExternId(), statusId);
}
}
这里可以吗?我尝试了几件事,比如
.map(MyClass::createSomeValue) //
但我需要将方法更改为静态方法。而且我不是静态方法的忠实粉丝。
SonarQube 的解释是:
Method/constructor references are more compact and readable than using lambdas, and are therefore preferred.
是的,你可以使用 this::createSomeValue
:
private List<SomeValue> createSomeValues(List<Anything> anyList) {
return anyList //
.stream() //
.map(this::createSomeValue) //
.collect(Collectors.toList());
}
这种method reference is called "Reference to an instance method of a particular object"。在这种情况下,您指的是实例 this
.
的方法 createSomeValue
是否"better"使用lambda表达式见仁见智。但是,您可以参考 this answer written by Brian Goetz,它解释了为什么首先在语言中添加方法引用。
声纳告诉我"Replace this lambda with a method reference"
public class MyClass {
private List<SomeValue> createSomeValues(List<Anything> anyList) {
return anyList //
.stream() //
.map(anything -> createSomeValue(anything)) //
.collect(Collectors.toList());
}
private SomeValue createSomeValue(Anything anything) {
StatusId statusId = statusId.fromId(anything.getStatus().getStatusId());
return new SomeValue(anything.getExternId(), statusId);
}
}
这里可以吗?我尝试了几件事,比如
.map(MyClass::createSomeValue) //
但我需要将方法更改为静态方法。而且我不是静态方法的忠实粉丝。
SonarQube 的解释是:
Method/constructor references are more compact and readable than using lambdas, and are therefore preferred.
是的,你可以使用 this::createSomeValue
:
private List<SomeValue> createSomeValues(List<Anything> anyList) {
return anyList //
.stream() //
.map(this::createSomeValue) //
.collect(Collectors.toList());
}
这种method reference is called "Reference to an instance method of a particular object"。在这种情况下,您指的是实例 this
.
createSomeValue
是否"better"使用lambda表达式见仁见智。但是,您可以参考 this answer written by Brian Goetz,它解释了为什么首先在语言中添加方法引用。