自定义的数组自定义方法的Java对象 [英] Custom Methods for an Array of Custom Objects in Java

问题描述

我试图创建类型图书馆，在那里我可以存储类型图书馆的许多对象的数组我稍后会管理。之前，我太深，我试图让打印（）方法在阵列上，这样我可以简单地调用 myLibrary.print（）打印阵列。

I am trying to create an array of type Library, where I can store many objects of type Library that I'll manage later. Before I get too deep, I am trying to make a print() method on the array so that I can simply call myLibrary.print() to print the array.

public class Library {
    // Constructor

    public Library() {
    }

    public void print() {
        System.out.println("Library Sorted by Title");
    }
}

public class MediaManager {
    public static void main(String[] args) throws Exception {
        Library myLibrary[] = new Library[100];
        myLibrary.print();
    }
}

我收到一个错误说没有打印（）在库[] 。

我将如何去打印此阵？我只是通过数组循环中的主文件，并会调用每个对象单独的打印？如果是这种情况，在那里我会编写自定义的方法来对数组进行排序？

How would I go about printing this array? Would I just loop through the array in the main file and call a separate print on each object? If this is the case, where would I write custom methods to sort the array?

更新

从我的任务要求：
您的程序将使用类型库的一个阵列，用于存储从输入文件中读出所有的信息。

Requirements from my assignment: "Your program will use one array of type Library to store all information read from the input file."

在顶层，你将有一个名为Library类图书馆将有三个子类：。音乐，图书和电影音乐将有两个子类：歌曲和专辑书将有两个子类：小说和非小说电影，小说，非小说，乐曲和专辑不会有任何的子类。

"At the top level you will have a class called Library. Library will have three subclasses: Music, Book, and Movie. Music will have two subclasses: Song and Album. Book will have two subclasses: Fiction and Nonfiction. Movie, Fiction, Nonfiction, Song, and Album will not have any subclasses."

更新2

这是一个CS-101课程。我不觉得我应该需要使用具有可比性。

This is for a CS-101 course. I don't feel I should need to use Comparable.

推荐答案

在除了定义打印（）方法图书馆;您可以尝试以下操作：

In addition to defining print() method for Library; You can try following:

public void printLibrary (Library [] libraryArray) {
    for(Library library :  libraryArray) 
        library.print();
}

或者如果你超载的toString（）为图书馆您可以简单地使用：

public void printLibrary (Library [] libraryArray) {
    for(Library library :  libraryArray) 
        System.out.println(library);
}

和调用将像做：

Library myLibrary[] = new Library[100];
printLibrary(myLibrary);

编辑：

要你应该实现可比＆LT数组排序;图书馆与GT; 在图书馆类，并简单地用

To sort the array you should implement Comparable<Library> in Library class and simply use

Arrays.sort(myLibrary);

对数组排序。

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