Regular expressions

Regular expressions

Sir/Madam,

please tell me the meaning of the following code

import java.io.*; import java.util.*; class Demo{ public static void main(String args[]){ double d=1000000.1232323d; System.out.println(d); System.out.printf("%,.2f",d); } }

I can't understand this line " System.out.printf("%,.2f",d);"

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