DecimalFormat's Simple understanding

package com.sohu.tv.m.servlet;import java.text.decimalformat;/** * just for  simple test * *  @author  liweihan *  @time  2016-12-13 10:47 */ Public class test2 {    public static void main (String[]  args)  {        /**          * DecimalFormat  is a specific subclass of  NumberFormat  that is used to format decimal digits.          * DecimalFormat  includes a pattern   and a set of symbols           *  symbol Meaning:          0   A number          #  a number, not including  0          .  placeholder for decimal separator          ,  Placeholder for the grouping delimiter          ;  delimited format.          -  default negative number prefix.          %  multiply  100  and show as percent           ?  multiplied by  1000  and displayed as a binary currency symbol, in lieu of a currency sign, if double write, with              International currency symbol instead. If it appears in a pattern, replace the decimal delimiter with the currency decimal separator            .          X  any other character used in a prefix or suffix to refer to a special character in a prefix or suffix.          */        double  pi = 3.1415927;        //take an integer          system.out.println (New decimalformat ("0"). Format (PI)); //3         //takes a single-bit integer and a two-bit decimal         system.out.println ( New deciMalformat ("0.00"). Format (pi));  //3.14        //takes two-bit integers and three decimal places, The insufficient portion of the integer is filled with 0         system.out.println (New decimalformat ("00.000"). Format (pi));  //03.142        //take all integer parts          system.out.println (New decimalformat ("#"). Format (PI)); //3         //is calculated as a percentage and takes two decimal places          System.out.println (New decimalformat ("#.##%"). Format (PI)); //314.16%         long c = 2999792458l;        // Displays the scientific notation and takes 5 decimal         system.out.println (New decimalformat ("#.### # #E0 "). Format (c));  //2.99979e9        //Displays the scientific notation for two-bit integers and takes four decimal places          sYstem.out.println (New decimalformat ("00.### #E0"). Format (c));//29.9979e8         //each of the three bits is separated by commas         system.out.println (new  DecimalFormat (", # # #"). Format (c));//2,999,792,458        //embed formatting into text        system.out.println (New decimalformat ("size is per second, # # #米. "). Format (c)); The  //size is 2,999,792,458 meters per second.     }}

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DecimalFormat's Simple understanding