SONAR:用方法引用替换此lambda [英] SONAR: Replace this lambda with a method reference
问题描述
Sonar告诉我用方法参考替换这个lambda
Sonar tells me "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);
}
}
这可能吗?我尝试了几件事,比如
Is this possible here? I tried several things, like
.map(MyClass::createSomeValue) //
但我需要将方法更改为静态。而且我不是静态方法的忠实粉丝。
but I need to change the method to static then. And I am not a big fan of static methods.
SonarQube的解释是:
Explanation of SonarQube is:
方法/构造函数引用比使用lambdas更紧凑和可读,因此是首选。
Method/constructor references are more compact and readable than using lambdas, and are therefore preferred.
推荐答案
是的,您可以使用 this :: createSomeValue
:
private List<SomeValue> createSomeValues(List<Anything> anyList) {
return anyList //
.stream() //
.map(this::createSomeValue) //
.collect(Collectors.toList());
}
这种方法引用被称为引用特定对象的实例方法。在这种情况下,您指的是实例此
的方法 createSomeValue
。
This kind of method reference is called "Reference to an instance method of a particular object". In this case, you are referring to the method createSomeValue
of the instance this
.
使用lambda表达式是否更好是一个意见问题。但是,您可以参考此答案 / brian-goetz> Brian Goetz 解释了为什么首先在语言中添加了方法引用。
Whether it is "better" or not that using a lambda expression is a matter of opinion. However, you can refer to this answer written by Brian Goetz that explains why method-references were added in the language in the first place.
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