用java创建一学生数据库School，创建一表studb，包含字段：学号、姓名、性别、专业、入学年份。编写程序对studb表进行学生信息的增、删、改、查操作。

好的，下面是使用Java语言实现对studb表进行学生信息增删改查操作的示例代码：

import java.sql.*;

public class StudentDatabase {
    public static void main(String[] args) {
        //数据库连接参数
        String url = "jdbc:mysql://localhost:3306/School?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC";
        String user = "root";
        String password = "password";

        try {
            //加载MySQL JDBC驱动程序
            Class.forName("com.mysql.jdbc.Driver");

            //创建数据库连接对象
            Connection conn = DriverManager.getConnection(url, user, password);

            //创建Statement对象
            Statement stmt = conn.createStatement();

            //创建studb表
            String createTableSql = "CREATE TABLE IF NOT EXISTS studb (id INT PRIMARY KEY, name VARCHAR(20), gender VARCHAR(10), major VARCHAR(20), enrollment INT)";
            stmt.executeUpdate(createTableSql);

            //插入数据
            String insertSql = "INSERT INTO studb VALUES (1, '小明', '男', '计算机科学与技术', 2020)";
            stmt.executeUpdate(insertSql);
            System.out.println("插入数据成功");

            //查询数据
            String querySql = "SELECT * FROM studb";
            ResultSet rs = stmt.executeQuery(querySql);
            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getString("name");
                String gender = rs.getString("gender");
                String major = rs.getString("major");
                int enrollment = rs.getInt("enrollment");
                System.out.println("id=" + id + ", name=" + name + ", gender=" + gender + ", major=" + major + ", enrollment=" + enrollment);
            }

            //更新数据
            String updateSql = "UPDATE studb SET name = '小红', gender = '女', major = '软件工程', enrollment = 2021 WHERE id = 1";
            stmt.executeUpdate(updateSql);
            System.out.println("更新数据成功");

            //查询数据
            rs = stmt.executeQuery(querySql);
            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getString("name");
                String gender = rs.getString("gender");
                String major = rs.getString("major");
                int enrollment = rs.getInt("enrollment");
                System.out.println("id=" + id + ", name=" + name + ", gender=" + gender + ", major=" + major + ", enrollment=" + enrollment);
            }

            //删除数据
            String deleteSql = "DELETE FROM studb WHERE id = 1";
            stmt.executeUpdate(deleteSql);
            System.out.println("删除数据成功");

            //查询数据
            rs = stmt.executeQuery(querySql);
            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getString("name");
                String gender = rs.getString("gender");
                String major = rs.getString("major");
                int enrollment = rs.getInt("enrollment");
                System.out.println("id=" + id + ", name=" + name + ", gender=" + gender + ", major=" + major + ", enrollment=" + enrollment);
            }

            //关闭数据库连接
            rs.close();
            stmt.close();
            conn.close();

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }

    }
}

上述代码中，使用了JDBC的方式连接MySQL数据库，并创建了Statement对象。然后创建了studb表，插入数据、查询数据、更新数据和删除数据等操作。最后关闭了数据库连接。如果需要使用该程序进行实际操作，需要根据实际情况修改数据库连接参数和数据操作逻辑。