使用java设计一个简单的多媒体系统,基类MyMedia(String mediaName, float price, String press, String artist)类，其中包含MyBook(String bookISBN,String editor)、MyCd(String cdISRC)及MyTape(String tapeISRC)三个子类，三个子类中都有print方法输出信息。按照类的设计模式，完成他们的插入book、删除book、查找book,插入cd、删除cd、查找cd,插入tape、删除tape、查找tape以及查找全部媒体的功能。MyMedia类中有并且还拥有一个interfaceMedias接口和一个MediaTest测试类,interfaceMedias接口的方法有public int addMedia(Vector medias,MyMedia tempMedia); public int deleteMedia(Vector medias); public MyMedia findMedia(Vector medias,String artist); public void printlnMedia(Vector medias); public String input(); 并且MediaTest测试类实现了interfaceMedias接口

好的，我理解了你的问题。下面是一个简单的多媒体系统的 Java 代码，它包括 MyMedia、MyBook、MyCd、MyTape 类和一个 MediaTest 类：

import java.util.*;

interface interfaceMedias {
    public int addMedia(Vector medias, MyMedia tempMedia);
    public int deleteMedia(Vector medias);
    public MyMedia findMedia(Vector medias, String artist);
    public void printlnMedia(Vector medias);
    public String input();
}

class MyMedia {
    private String mediaName;
    private float price;
    private String press;
    private String artist;

    public MyMedia(String mediaName, float price, String press, String artist) {
        this.mediaName = mediaName;
        this.price = price;
        this.press = press;
        this.artist = artist;
    }

    public void print() {
        System.out.println("Media Name: " + mediaName);
        System.out.println("Price: " + price);
        System.out.println("Press: " + press);
        System.out.println("Artist: " + artist);
    }

    public String getArtist() {
        return artist;
    }
}

class MyBook extends MyMedia {
    private String bookISBN;
    private String editor;

    public MyBook(String mediaName, float price, String press, String artist,
                  String bookISBN, String editor) {
        super(mediaName, price, press, artist);
        this.bookISBN = bookISBN;
        this.editor = editor;
    }

    public void print() {
        super.print();
        System.out.println("Book ISBN: " + bookISBN);
        System.out.println("Editor: " + editor);
    }

    public String getISBN() {
        return bookISBN;
    }
}

class MyCd extends MyMedia {
    private String cdISRC;

    public MyCd(String mediaName, float price, String press, String artist,
                String cdISRC) {
        super(mediaName, price, press, artist);
        this.cdISRC = cdISRC;
    }

    public void print() {
        super.print();
        System.out.println("CD ISRC: " + cdISRC);
    }

    public String getISRC() {
        return cdISRC;
    }
}

class MyTape extends MyMedia {
    private String tapeISRC;

    public MyTape(String mediaName, float price, String press, String artist,
                  String tapeISRC) {
        super(mediaName, price, press, artist);
        this.tapeISRC = tapeISRC;
    }

    public void print() {
        super.print();
        System.out.println("Tape ISRC: " + tapeISRC);
    }

    public String getISRC() {
        return tapeISRC;
    }
}

public class MediaTest implements interfaceMedias {
    public static void main(String[] args) {
        Vector medias = new Vector();
        MediaTest mt = new MediaTest();

        // Add some media
        MyBook book1 = new MyBook("Java Programming", 29.99f, "O'Reilly Media",
                                   "John Doe", "9781492078005", "Jane Smith");
        mt.addMedia(medias, book1);
        MyCd cd1 = new MyCd("Greatest Hits", 12.99f, "Sony Music", "Bob Dylan",
                            "GBGQY1600001");
        mt.addMedia(medias, cd1);
        MyTape tape1 = new MyTape("Live Concert", 9.99f, "Warner Music", "Queen",
                                  "GBAYE8300017");
        mt.addMedia(medias, tape1);

        // Find media by artist
        System.out.println("Find media by artist: Bob Dylan");
        MyMedia m = mt.findMedia(medias, "Bob Dylan");
        if (m != null) {
            m.print();
        } else {
            System.out.println("No media found.");
        }

        // Delete a book
        System.out.println("Delete a book: Java Programming");
        mt.deleteMedia(medias, book1);

        // Print all media
        System.out.println("Print all media:");
        mt.printlnMedia(medias);
    }

    public int addMedia(Vector medias, MyMedia tempMedia) {
        medias.addElement(tempMedia);
        return medias.size();
    }

    public int deleteMedia(Vector medias, MyMedia tempMedia) {
        int index = medias.indexOf(tempMedia);
        if (index >= 0) {
            medias.removeElementAt(index);
            return medias.size();
        } else {
            return -1;
        }
    }

    public MyMedia findMedia(Vector medias, String artist) {
        for (int i = 0; i < medias.size(); i++) {
            MyMedia m = (MyMedia) medias.elementAt(i);
            if (m.getArtist().equals(artist)) {
                return m;
            }
        }
        return null;
    }

    public void printlnMedia(Vector medias) {
        for (int i = 0; i < medias.size(); i++) {
            MyMedia m = (MyMedia) medias.elementAt(i);
            m.print();
            System.out.println();
        }
    }

    public String input() {
        Scanner sc = new Scanner(System.in);
        return sc.nextLine();
    }
}

在这个代码中，MyMedia 类是基类，MyBook、MyCd、MyTape 类是它的子类。MediaTest 类实现了 interfaceMedias 接口，它包括插入、删除、查找和输出媒体的方法。在 main 方法中，我们创建了一些媒体，然后查找了一个艺术家的媒体，删除了一个书籍，最后输出了所有媒体。