public static void show_symbol_table(Symbol_table symbol_table) {
        System.out.println("=============Symbol Table=============");
        System.out.println("total number: " + symbol_table.symbol_name.size());
        for (int i = 0; i < symbol_table.symbol_name.size(); i++) {
            System.out.println(symbol_table.symbol_type.get(i).toString() + ": " +
                    symbol_table.symbol_name.get(i).toString());
        }
        System.out.println("=================End==================");
    }