Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
747 views
in Technique[技术] by (71.8m points)

lambda - Java 8 Supplier with arguments in the constructor

Why do suppliers only support no-arg constructors?

If the default constructor is present, I can do this:

create(Foo::new)

But if the only constructor takes a String, I have to do this:

create(() -> new Foo("hello"))
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

But, a 1-arg constructor for T that takes a String is compatible with Function<String,T>:

Function<String, Foo> fooSupplier = Foo::new;

Which constructor is selected is treated as an overload selection problem, based on the shape of the target type.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...