static String swap ( String str , int i , int j ) {
  char ch [ ] = str . toCharArray ( ) ;
  char temp = ch [ i ] ;
  ch [ i ] = ch [ j ] ;
  ch [ j ] = temp ;
  return String . valueOf ( ch ) ;
}

static String swap ( String str , int i , int j ) { char ch [ ] = str . toCharArray ( ) ; char temp = ch [ i ] ; ch [ i ] = ch [ j ] ; ch [ j ] = temp ; return String . valueOf ( ch ) ; }
(method_declaration (modifiers) type: (type_identifier) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (array_access array: (identifier) index: (identifier)))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (identifier)))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier))) (return_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))