How to set different fonts for tables and algorithms

To long for the comment.

Command small had to be before table or your algorithm code. For example:

documentclass[12pt]{article}
usepackage[]{algorithm2e}
usepackage{lipsum}

begin{document}
lipsum[11]
begin{table}[ht]
footnotesize   % that change of the font size is better visible
centering
begin{tabular}{rl}
hline
 1  &   some text   
11  &   some text   
hline
end{tabular}
end{table}

lipsum[12]

begin{algorithm}[ht]
footnotesize   % that change of the font size iz better visible
 KwData{this text}
 KwResult{how to write algorithm with LaTeX2e }
 initialization;
 While{not at end of this document}{
  read current;
  eIf{understand}{
   go to next section;
   current section becomes this one;
   }{
   go back to the beginning of current section;
  }
 }
 caption{How to write algorithms}
end{algorithm}

lipsum[13]

end{document}

Note: In MWE is selected footnotesize font size that their size changes is better visible.