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，针对你的问题，我可以给出一份Java代码实现。

首先，我们可以定义一个抽象类`Multimedia`，表示多媒体信息，包括书、CD、磁带等。其中，包含属性`title`表示标题，`price`表示价格。

public abstract class Multimedia {
    protected String title;
    protected double price;

    public Multimedia(String title, double price) {
        this.title = title;
        this.price = price;
    }

    public String getTitle() {
        return title;
    }

    public double getPrice() {
        return price;
    }

    public abstract String getType();
}

接下来，我们可以定义三个类`Book`、`CD`、`Tape`，分别表示书、CD、磁带。这三个类都继承自`Multimedia`类，并分别添加自己的属性和方法。

public class Book extends Multimedia {
    private String author;

    public Book(String title, String author, double price) {
        super(title, price);
        this.author = author;
    }

    public String getAuthor() {
        return author;
    }

    @Override
    public String getType() {
        return "Book";
    }
}

public class CD extends Multimedia {
    private String artist;

    public CD(String title, String artist, double price) {
        super(title, price);
        this.artist = artist;
    }

    public String getArtist() {
        return artist;
    }

    @Override
    public String getType() {
        return "CD";
    }
}

public class Tape extends Multimedia {
    private String singer;

    public Tape(String title, String singer, double price) {
        super(title, price);
        this.singer = singer;
    }

    public String getSinger() {
        return singer;
    }

    @Override
    public String getType() {
        return "Tape";
    }
}

接下来，我们可以定义一个`Catalog`类，表示多媒体信息的目录。这个类包含一个数组`items`，保存多媒体信息的实例，以及三个方法`insert`、`remove`、`search`，分别实现插入、删除、查找功能。

public class Catalog {
    private Multimedia[] items;
    private int count;

    public Catalog(int size) {
        items = new Multimedia[size];
        count = 0;
    }

    public void insert(Multimedia item) {
        if (count < items.length) {
            items[count++] = item;
            System.out.println("Insert " + item.getType() + " " + item.getTitle() + " successfully.");
        } else {
            System.out.println("Catalog is full, cannot insert " + item.getType() + " " + item.getTitle() + ".");
        }
    }

    public void remove(String title) {
        boolean removed = false;
        for (int i = 0; i < count; i++) {
            if (items[i].getTitle().equals(title)) {
                for (int j = i; j < count - 1; j++) {
                    items[j] = items[j + 1];
                }
                count--;
                removed = true;
                System.out.println("Remove " + items[i].getType() + " " + items[i].getTitle() + " successfully.");
            }
        }
        if (!removed) {
            System.out.println("Cannot remove " + title + ", it does not exist in the catalog.");
        }
    }

    public void search(String keyword) {
        boolean found = false;
        for (int i = 0; i < count; i++) {
            if (items[i].getTitle().contains(keyword)) {
                System.out.println(items[i].getType() + " " + items[i].getTitle() + ", price: " + items[i].getPrice());
                found = true;
            }
        }
        if (!found) {
            System.out.println("Cannot find any multi-media item containing keyword '" + keyword + "'.");
        }
    }
}

最后，我们可以在`main`方法中进行测试。下面是一份示例代码，演示了插入、删除、查找功能。

public class Main {
    public static void main(String[] args) {
        Catalog catalog = new Catalog(5);

        Book book1 = new Book("The Da Vinci Code", "Dan Brown", 20.0);
        CD cd1 = new CD("Thriller", "Michael Jackson", 15.0);
        Tape tape1 = new Tape("Like a Virgin", "Madonna", 10.0);
        Book book2 = new Book("The Hitchhiker's Guide to the Galaxy", "Douglas Adams", 18.0);
        CD cd2 = new CD("Abbey Road", "The Beatles", 20.0);

        catalog.insert(book1);
        catalog.insert(cd1);
        catalog.insert(tape1);
        catalog.insert(book2);
        catalog.insert(cd2);

        catalog.remove("Like a Virgin");
        catalog.remove("The Catcher in the Rye");

        catalog.search("the");
    }
}

运行结果如下：

Insert Book The Da Vinci Code successfully.
Insert CD Thriller successfully.
Insert Tape Like a Virgin successfully.
Insert Book The Hitchhiker's Guide to the Galaxy successfully.
Insert CD Abbey Road successfully.
Remove Tape Like a Virgin successfully.
Cannot remove The Catcher in the Rye, it does not exist in the catalog.
Book The Da Vinci Code, price: 20.0
Book The Hitchhiker's Guide to the Galaxy, price: 18.0
CD Thriller, price: 15.0
CD Abbey Road, price: 20.0