private static boolean isAllSame ( int N ) {
  String str = String . valueOf ( N ) ;
  char [ ] chars = str . toCharArray ( ) ;
  char c = chars [ 0 ] ;
  for ( int i = 0 ;
  i < chars . length ;
  i ++ ) {
    if ( chars [ i ] != c ) return false ;
  }
  return true ;
}

private static boolean isAllSame ( int N ) { String str = String . valueOf ( N ) ; char [ ] chars = str . toCharArray ( ) ; char c = chars [ 0 ] ; for ( int i = 0 ; i < chars . length ; i ++ ) { if ( chars [ i ] != c ) return false ; } return true ; }
(method_declaration (modifiers) type: (boolean_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) 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: (decimal_integer_literal)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (field_access object: (identifier) field: (identifier))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier))) consequence: (return_statement (false))))) (return_statement (true))))