Question

conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/student","root","root

为什么想上边那样写会报错
错误Type mismatch: cannot convert from java.sql.Connection to com.mysql.jdbc.Connection

Answer 1

DriverManager.getConnection()返回的连接类型与你用来接收的不匹配，要么是你定义的类型不正确，要么就进行一下类型的强制转换。