如何从泛型类调用方法作为参数

Question

我试图让我的代码使用泛型，但我似乎无法使用泛型让它工作。任何帮助，将不胜感激。

我有 3 个班级：课堂、课程、教师

我有以下工作代码 3 次：（随着班级的小变化）

private ObservableList<Classroom> parseClassrooms() {

    // create new Observable List

    ObservableList<Classroom> classrooms = FXCollections.observableArrayList();

    // get lines from file;

    ArrayList<String> arrayList = fhClassroom.read();

    for (String line : arrayList) {

        classrooms.add(Classroom.fromString(line));

    }

    return classrooms;

}

我的课程中的方法：

@Override

public String toString() {

    return name;

}

public static Classroom fromString(String line) {

    return new Classroom(line);

}

是否可以使这种方法通用？并将类作为参数传递？

我想要以下内容：

private ObservableList<T> parseClassrooms(T, FileHelper fh) {

    // create new Observable List

    ObservableList<T> items = FXCollections.observableArrayList();

    // get lines from file;

    ArrayList<String> arrayList = fh.read();

    for (String line : arrayList) {

        items.add(T.fromString(line));

    }

    return items;

}

Answer 1

我最好的尝试：import java.util.ArrayList;import java.util.function.Function;public class Helper {&nbsp; &nbsp; public static <T> ObservableList<T> parseItems(Function<String, T> lineToItemFunction, FileHelper fh) {&nbsp; &nbsp; &nbsp; &nbsp; // create new Observable List&nbsp; &nbsp; &nbsp; &nbsp; ObservableList<T> items = FXCollections.observableArrayList();&nbsp; &nbsp; &nbsp; &nbsp; // get lines from file;&nbsp; &nbsp; &nbsp; &nbsp; ArrayList<String> arrayList = fh.read();&nbsp; &nbsp; &nbsp; &nbsp; for (String line : arrayList) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; items.add(lineToItemFunction.apply(line));&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; return items;&nbsp; &nbsp; }}你这样称呼它：ObservableList<ClassRoom> classRooms = Helper.parseItems(ClassRoom::fromLine, fileHelper);