static boolean isVowel ( char ch ) {
  switch ( ch ) {
    case 'a' : case 'e' : case 'i' : case 'o' : case 'u' : return true ;
    default : return false ;
  }
}

static boolean isVowel ( char ch ) { switch ( ch ) { case ' a ' : case ' e ' : case ' i ' : case ' o ' : case ' u ' : return true ; default : return false ; } }
(method_declaration (modifiers) type: (boolean_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (switch_expression condition: (parenthesized_expression (identifier)) body: (switch_block (switch_block_statement_group (switch_label (character_literal))) (switch_block_statement_group (switch_label (character_literal))) (switch_block_statement_group (switch_label (character_literal))) (switch_block_statement_group (switch_label (character_literal))) (switch_block_statement_group (switch_label (character_literal)) (return_statement (true))) (switch_block_statement_group (switch_label) (return_statement (false)))))))