Better way to represent array in java properties file

Question

I m currently making a  properties file that needs to be loaded and transformed into an array   But there is a possibility of anywhere from 0-25 of each of the property keys to exist   I tried a few implementations but i m just stuck at doing this cleanly   Anyone have any ideas   foo 1 filename foo txt foo 1 expire 200  foo 2 filename foo2 txt foo 2 expire 10  etc more foo s  bar 1 filename bar txt bar 1 expire 100   where I ll assemble the filename expire pairings into a data object  as part of an array for each parent property element like foo myobject   Formatting of the properties file can change  I m open to ideas

User · Answer

Use YAML files for properties  this supports properties as an array   Quick glance about YAML      A superset of JSON  it can do everything JSON can   more    Simple to read Long properties into multiline values Supports comments Properties as Array YAML Validation

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Didn t exactly get your intent  Do check Apache Commons configuration library http   commons apache org configuration   You can have multiple values against a key as in  key value1 value2  and you can read this into an array as configuration getAsStringArray  key

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I highly recommend using Apache Commons  http   commons apache org configuration     It has the ability to use an XML file as a configuration file   Using an XML structure makes it easy to represent arrays as lists of values rather than specially numbered properties

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here is another way to do by implementing yourself the mechanism  here we consider that the array should start with 0 and would have no hole between indice                  get a string property s value         param propKey property key         param defaultValue default value if the property is not found         return value             public static String getSystemStringProperty String propKey              String defaultValue            String strProp   System getProperty propKey           if  strProp    null                strProp   defaultValue                    return strProp                        internal recursive method to get string properties  array          param curResult current result         param paramName property key prefix         param i current indice         return array of property s values             private static List lt String gt  getSystemStringProperties List lt String gt  curResult  String paramName  int i            String paramIValue   getSystemStringProperty paramName         String valueOf i   null           if  paramIValue    null                return curResult                    curResult add paramIValue           return getSystemStringProperties curResult  paramName  i 1                         get the values from a property key prefix         param paramName property key prefix         return string array of values             public static String   getSystemStringProperties              String paramName            List lt String gt  stringProperties   getSystemStringProperties new ArrayList lt String gt     paramName  0           return stringProperties toArray new String stringProperties size              Here is a way to test         Test     public void should be able to get array of properties             System setProperty  my parameter 0    ooO            System setProperty  my parameter 1    oO            System setProperty  my parameter 2    boo               WHEN          String   pluginParams   PropertiesHelper getSystemStringProperties  my parameter                THEN         assertThat pluginParams  isNotNull            assertThat pluginParams  containsExactly  ooO   oO   boo            System out println pluginParams 0  toString             hope this helps  and all remarks are welcome

User · Answer

Either define a delimiter that will not be a potential value or learn to use XML   If you still insist on using properties use one of the methods that will return a list of all keys   Your key appears to have three parts a group identifier  foo  bar  an index  1  2  and then an element name  filename  expire    Get all the keys break them into their component parts  Create a List for each type of identifier  when processing the list use the identifier to determine which List to add to   Create you paired elements as you said and simply add to the list   If the index order is important either add that as a field to your paired elements or sort the keys before processing

User · Answer

I can suggest using delimiters and using the   String split delimiter   Example properties file   MON 0800 Something Something1  Something2  prop load new FileInputStream      Myseccretnetwork  Project  props properties     String  values   prop get  MON   toString   split         Hope that helps

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As user  Skip Head  already pointed out  csv or a any table file format would be a better fitt in your case   If it is an option for you  maybe this Table implementation might interest you

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I have custom loading  Properties must be defined as   key 0 value0 key 1 value1       Custom loading       Return array from properties file  Array must be defined as  key 0 value0    key 1 value1          public List lt String gt  getSystemStringProperties String key            result list     List lt String gt  result   new LinkedList lt  gt             defining variable for assignment in loop condition part     String value          next value loading defined in condition part     for int i   0   value   YOUR PROPERTY OBJECT getProperty key         i      null  i              result add value                 return     return result

User · Answer

Actually all answers are wrong  Easy  foo  0 filename

[java] Better way to represent array in java properties file

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