public static boolean strive ( String s ) {
  Stack < Character > stack = new Stack < > ( ) ;
  stack . push ( s . charAt ( 0 ) ) ;
  for ( int i = 1 ;
  i < s . length ( ) ;
  i ++ ) {
    char ch1 = s . charAt ( i ) ;
    if ( ch1 == ')' ) {
      if ( ! stack . isEmpty ( ) && stack . peek ( ) == '(' ) {
        stack . pop ( ) ;
      }
      else {
        return false ;
      }
    }
    else {
      stack . push ( '(' ) ;
    }
  }
  return stack . size ( ) == 0 ;
}

public static boolean strive ( String s ) { Stack < Character > stack = new Stack < > ( ) ; stack . push ( s . charAt ( 0 ) ) ; for ( int i = 1 ; i < s . length ( ) ; i ++ ) { char ch1 = s . charAt ( i ) ; if ( ch1 == ' ) ' ) { if ( ! stack . isEmpty ( ) && stack . peek ( ) == ' ( ' ) { stack . pop ( ) ; } else { return false ; } } else { stack . push ( ' ( ' ) ; } } return stack . size ( ) == 0 ; }
(method_declaration (modifiers) type: (boolean_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier))) body: (block (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments)) arguments: (argument_list)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (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: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (character_literal))) consequence: (block (if_statement condition: (parenthesized_expression (binary_expression left: (unary_expression operand: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (character_literal)))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) alternative: (block (return_statement (false))))) alternative: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (character_literal)))))))) (return_statement (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)))))