Adding char in a specific string location

Question

Hello I'm just a beginner in java and i have a problem adding a comma on a string of digits like for example 1000 will be 1,000 in output .

i can use :

String digitsWithComma = ""; digitsWithComma = str.substring(0,1) + "," + str.substring(1);

but the problem is it only works on a thousand not on a higher digits. can someone please help me with this

You could use regex replace, but for better understatement, try iterating over the string and using a similar method to yours ;) — Luan Nico
– Luan Nico, Commented Apr 6, 2017 at 16:31
Also, you might use this: stackoverflow.com/questions/5323502/… — Luan Nico
– Luan Nico, Commented Apr 6, 2017 at 16:32
Seems a duplicate question, anyways, stackoverflow.com/questions/5379231/… — Ramanan
– Ramanan, Commented Apr 6, 2017 at 16:42

Jordan · Accepted Answer · 2017-04-06 16:37:14Z

2

Java has a concept called Number Formatting that seems to be what you're doing:

import java.text.NumberFormat;
String output = NumberFormat.getNumberInstance(Locale.US).format(1000000);

Since we gave it the US locale, it would print out 1,000,000.

Generally speaking, if you find yourself wondering "how can I implement X feature?" chances are good that Java already has a standard or built-in way of doing it, especially if you're dealing with formatting of any kind.

answered Apr 6, 2017 at 16:37

Jordan

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