java创建一个Database接口，包含connect()方法和disconnect()方法，用于连接和断开数据库连接。然后创建一个MySQLDatabase类和一个OracleDatabase类，它们都实现了Database接口，并分别实现了连接和断开连接的方法。

好的，以下是Java语言的实现代码：

public interface Database {
    void connect();
    void disconnect();
}

public class MySQLDatabase implements Database {
    private String host;
    private String username;
    private String password;
    private String database;

    public MySQLDatabase(String host, String username, String password, String database) {
        this.host = host;
        this.username = username;
        this.password = password;
        this.database = database;
    }

    @Override
    public void connect() {
        System.out.println(String.format("Connecting to MySQL database %s at %s as %s...", database, host, username));
        // 连接MySQL数据库的代码
        System.out.println("Connected to MySQL database.");
    }

    @Override
    public void disconnect() {
        System.out.println(String.format("Disconnecting from MySQL database %s at %s...", database, host));
        // 断开MySQL数据库连接的代码
        System.out.println("Disconnected from MySQL database.");
    }
}

public class OracleDatabase implements Database {
    private String host;
    private String username;
    private String password;
    private String database;

    public OracleDatabase(String host, String username, String password, String database) {
        this.host = host;
        this.username = username;
        this.password = password;
        this.database = database;
    }

    @Override
    public void connect() {
        System.out.println(String.format("Connecting to Oracle database %s at %s as %s...", database, host, username));
        // 连接Oracle数据库的代码
        System.out.println("Connected to Oracle database.");
    }

    @Override
    public void disconnect() {
        System.out.println(String.format("Disconnecting from Oracle database %s at %s...", database, host));
        // 断开Oracle数据库连接的代码
        System.out.println("Disconnected from Oracle database.");
    }
}

以上是一个基本的实现，你可以根据自己的需求对其进行扩展和修改。