Retreiving only particular keys from a properties file

Question

hello friends,
can someone kindly tell me , is there any way to retreive only particular keys from a properties file .
for e.g the file is as follows
abc.properties
ad_1 = "hello"
ad_1_fg = "bye"
ad_1_hj = "dfd"
ad_1_jk = "sdfsdf"
bk_2_jk = "sdfdsf"
bk_2_lk = "klklk"
so lets say at run time , i get the key ad_1 , and i am told to retreive all the keys from the properties file starting only with ad_1, then how do i do it.
I tried using ResourceBundl,PropertyResourceBundle, but they all get all the keys, and tehre is no way to specify within them that get only keys with particular format.
please do help me

Answer 1

Retrieve all the properties, and then loop over them
looking for those whose names match the pattern you
need.hello jverd thanks for your quick response, i was thinking the same, but lets say i retreive all keys, then how do i match them to my pattern, i mean if some keys is like this jhk_ad_1 , so i dont want that , i only want keys starting from ad_1 , hope u got what i am trying to say.
i mean i want all the keys that are starting from the runtime value i am getting