java使用数组保存书、CD、磁带等信息，实现插入、删除、查找功能。输入、删除时，要显示操作正确与否的信息；查找时按关键字值进行查找，并显示查找结果。

好的，我可以为你提供一个基于数组的 Java 类来保存书、CD、磁带等信息，并实现插入、删除、查找功能。以下是示例代码：

public class MediaLibrary {
    private Media[] mediaList;
    private int size;

    public MediaLibrary(int capacity) {
        mediaList = new Media[capacity];
        size = 0;
    }

    public void insertMedia(Media media) {
        if (size < mediaList.length) {
            mediaList[size] = media;
            size++;
            System.out.println("Media inserted successfully.");
        } else {
            System.out.println("Media library is full.");
        }
    }

    public void deleteMedia(Media media) {
        int index = findMedia(media);
        if (index >= 0) {
            for (int i = index; i < size - 1; i++) {
                mediaList[i] = mediaList[i + 1];
            }
            size--;
            System.out.println("Media deleted successfully.");
        } else {
            System.out.println("Media not found.");
        }
    }

    public void searchMedia(String keyword) {
        boolean found = false;
        for (int i = 0; i < size; i++) {
            if (mediaList[i].getTitle().toLowerCase().contains(keyword.toLowerCase())) {
                System.out.println(mediaList[i]);
                found = true;
            }
        }
        if (!found) {
            System.out.println("No results found.");
        }
    }

    private int findMedia(Media media) {
        for (int i = 0; i < size; i++) {
            if (mediaList[i].equals(media)) {
                return i;
            }
        }
        return -1;
    }
}

public abstract class Media {
    private String title;

    public Media(String title) {
        this.title = title;
    }

    public String getTitle() {
        return title;
    }

    public abstract String toString();
}

public class Book extends Media {
    private String author;
    private String publisher;
    private String isbn;

    public Book(String title, String author, String publisher, String isbn) {
        super(title);
        this.author = author;
        this.publisher = publisher;
        this.isbn = isbn;
    }

    @Override
    public String toString() {
        return "Book: " + getTitle() + " by " + author + ", published by " + publisher + ", ISBN: " + isbn;
    }
}

public class CD extends Media {
    private String artist;
    private String label;
    private String upc;

    public CD(String title, String artist, String label, String upc) {
        super(title);
        this.artist = artist;
        this.label = label;
        this.upc = upc;
    }

    @Override
    public String toString() {
        return "CD: " + getTitle() + " by " + artist + ", label: " + label + ", UPC: " + upc;
    }
}

public class Tape extends Media {
    private String artist;
    private String label;
    private String upc;

    public Tape(String title, String artist, String label, String upc) {
        super(title);
        this.artist = artist;
        this.label = label;
        this.upc = upc;
    }

    @Override
    public String toString() {
        return "Tape: " + getTitle() + " by " + artist + ", label: " + label + ", UPC: " + upc;
    }
}

这个示例代码中，我们定义了一个名为 `MediaLibrary` 的类来管理媒体对象。这个类包括了三个方法：`insertMedia`、`deleteMedia`、和 `searchMedia`。`insertMedia` 方法用于将一个媒体对象添加到媒体列表中，并打印添加成功的信息。`deleteMedia` 方法用于从媒体列表中删除一个指定的媒体对象，并打印删除结果的信息。`searchMedia` 方法用于按照关键字值进行查找，并打印查找结果的信息。

我们还定义了三个不同的媒体对象类：`Book`、`CD` 和 `Tape`。每个媒体对象类都有一个 `toString` 方法来定义对象的字符串表示形式，以便在打印媒体对象时使用。

下面是一个简单的示例使用代码：

// 创建一个媒体库对象，设置容量为 10
MediaLibrary mediaLibrary = new MediaLibrary(10);

// 创建一些媒体对象
Media book1 = new Book("The Great Gatsby", "F. Scott Fitzgerald", "Scribner", "9780743273565");
Media cd1 = new CD("Thriller", "Michael Jackson", "Epic Records", "5099749626928");
Media tape1 = new Tape("Purple Rain", "Prince", "Warner Bros. Records", "07599251074");

// 将媒体对象添加到媒体库中
mediaLibrary.insertMedia(book1);
mediaLibrary.insertMedia(cd1);
mediaLibrary.insertMedia(tape1);

// 查找媒体对象
mediaLibrary.searchMedia("thriller");

// 删除媒体对象
mediaLibrary.deleteMedia(cd1);
mediaLibrary.deleteMedia(cd1);

输出结果如下：

Media inserted successfully.
Media inserted successfully.
Media inserted successfully.
CD: Thriller by Michael Jackson, label: Epic Records, UPC: 5099749626928
Media deleted successfully.
Media not found.

这个示例代码演示了如何使用 `MediaLibrary` 类来管理媒体对象，并实现插入、删除、查找功能。你可以根据自己的需求，修改这个示例代码以适应你的具体需求。