将函数引用作为参数传递

贾斯珀

是否可以将对方法的引用作为参数传递？

例如：

public static void main(String[] args) {
    String data = "name: John, random text, address: leetStreet";
    Person person;

    //if regex matches, use method reference, to send the result. 
    applyDataToPerson(data, "name: (\\w+)", person, Person::setName);
    applyDataToPerson(data, "address: (\\w+)", person, Person::setAddress);
}

private static void applyDataToPerson(String data, String regex, Person person, 
 Function<Person> f) {
    Matcher match = Pattern.compile(regex).matcher(data);
    if (match.matches()) person.f(match.group(1));
}

class Person {
    private String name;
    private String address;

    public void setName(String name) {
        this.name = name;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}

如果不是，那么提供引用方法的替代方法是什么？开关盒构造？

shmosel

我认为您正在寻找BiConsumer：

private static void applyDataToPerson(String data, String regex, Person person, BiConsumer<Person, String> action) {
    Matcher match = Pattern.compile(regex).matcher(data);
    if (match.matches()) action.accept(person, match.group(1));
}

另外，您可以缩短方法签名，并使用单个参数Consumer来捕获您的person引用：

public static void main(String[] args) {
    String data = "name: John, random text, address: leetStreet";
    Person person;

    //if regex matches, use method reference, to send the result. 
    applyData(data, "name: (\\w+)", person::setName);
    applyData(data, "address: (\\w+)", person::setAddress);
}

private static void applyData(String data, String regex, Consumer<String> action) {
    Matcher match = Pattern.compile(regex).matcher(data);
    if (match.matches()) action.accept(match.group(1));
}

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