Java basic knowledge point (Must know the second)

1. How do I output a number to a three-bit comma-delimited format, such as "1,234,467"?

1  Packagecom. Gxjun.problem;2 3 ImportJava.text.DecimalFormat;4 ImportJava.util.Scanner;5 6 7 /*8 * How to output the number to a comma-delimited format of three bits,9 * For example "1,234,467"? Ten  * */ One  A   Public classFloatdirve { -    -    Public Static voidMain (String args []) { theScanner reader =NewScanner (system.in); -        while(Reader.hasnext ()) { - System.out.println (Funcformat (Reader.nextdouble ())); -       } +    } -   /*use a method to handle this format*/ +    Public StaticString Funcformat (DoubleDoub) { AString str= "# # #"; at     intlen=string.valueof (Doub). Length (); -      for(intI=3;i<=len;i+=3){ -Str+= ", # # #"; -     } -DecimalFormat DECF =NewDecimalFormat (); - Decf.applypattern (str); in    returnDecf.format (Doub); -   } to}

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Java basic knowledge point (Must know the second)