package?JDBC;

import?java.sql.Connection;
import?java.sql.DriverManager;


import?java.sql.ResultSet;

import?com.mysql.jdbc.Statement;



public?class?jdbc?{

	private?static?final?String?URL?="jdbc:mysql://127.0.0.1:3306/zhao";
	private?static?final?String?USER?="root";
	private?static?final?String?PASSWORD?="";

	public?static?void?main(String[]?args)?throws?Exception?{

		//?加載驅動程序
		Class.forName("com.mysql.jdbc.Driver");
		//?獲取數據庫連接
		Connection?conn?=?DriverManager.getConnection(URL,?USER,?PASSWORD);
		//?通過數據庫連接操縱數據庫。實現增刪查改
		Statement?stmt=(Statement)?conn.createStatement();
		ResultSet?rs?=?stmt
				.executeQuery("select?user_name,age?from?imocc_goddess");

		while?(rs.next())?{
			System.out.println(rs.getString("user_name")?+?","
					+?rs.getInt("age"));

		}
	}

}

報錯說：

Exception in thread "main" java.lang.IncompatibleClassChangeError: Found class com.mysql.jdbc.Statement, but interface was expected

at JDBC.jdbc.main(jdbc.java:25)