Hi, I have a string that looks something like this String test = "test0001234567"; I want to just take the last 7 digits of that string so I can do stuff with just those 7 digits later (i.e. put them into a database) How do I do that? Thanks
Just be careful - the parameters for the substring method were definitely designed by compiler guys . The first parameter is cool - it's the index of the first character. But the send parameter is NOT the number of characters. It is also not the index of the last character in the substring. It is the index of the last character PLUS ONE. That's cool if you need to use that index as the beginning of your next call to substring, but besides that it's VERY confusing. Luckily for you, there is a version of substring that doesn't require the second parameter. Using that one is a little easier. If there are N character in the string, you need to start at index N-7. That will get you the last seven characters of the string. String last7 = test.substring(test.length()-7); Note that this will blow up if the string is less than seven characters long. Joe
Joined: Aug 22, 2003
Thanks. That was very helpful.. I have another question though. Say I now have a bunch of ID numbers in a string called idnumbers the values lets say are 1234567, 7654321, 9999967, 2222222 Now how do I just disiplay the ones that END in 67 ? Thanks a ton.