public static Connection JDBC() throws SQLException { Driver driver = new com.mysql.jdbc.Driver(); String url = "jdbc:mysql://localhost_3306:3306/test"; Properties info = new Properties(); info.put("user", "root"); info.put("password", "jfy10122003"); Connection connect = driver.connect(url, info); return connect; }检查代码并修改

在中，localhost_3306应该改为localhost:3306，代码修改如下：

public static Connection JDBC() throws SQLException {
    Driver driver = new com.mysql.jdbc.Driver();
    String url = "jdbc:mysql://localhost:3306/test";
    Properties info = new Properties();
    info.put("user", "root");
    info.put("password", "jfy10122003");
    Connection connect = driver.connect(url, info);
    return connect;
}

此外，建议在使用完Connection后及时关闭连接，避免资源泄露。可以在finally块中关闭连接，代码修改如下：

public static Connection JDBC() throws SQLException {
    Driver driver = new com.mysql.jdbc.Driver();
    String url = "jdbc:mysql://localhost:3306/test";
    Properties info = new Properties();
    info.put("user", "root");
    info.put("password", "jfy10122003");
    Connection connect = null;
    try {
        connect = driver.connect(url, info);
        // ... do something with the connection
    } finally {
        if (connect != null) {
            connect.close();
        }
    }
    return connect;
}