如何在Stream链中调用setter [英] How to call setter in chain of Stream

问题描述

如何在不使用forEach（）的情况下调用Stream链中的setter？

How can I call the setter in chain of Stream without using forEach()?

List<Foo> newFoos = foos.stream()
        .filter(foo -> Foo::isBlue)
        .map(foo -> foo.setTitle("Some value")) //I am unable to use this because also changing the data type into Object
        .collect(Collectors.toList());

推荐答案

使用像这样的peek方法。它不会影响流。

Use peek method like this. It does not affect stream.

    List<Foo> newFoos = foos.stream()
            .filter(Foo::isBlue)
            .peek(foo -> foo.setTitle("Some value"))
            .collect(Collectors.toList());

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