Java BigDecimal Tool Class

 Packagecom.core.calculate;ImportJava.math.BigDecimal;ImportJava.text.DecimalFormat;/*** Created by tangxin on 2017/1/6 0006. * If you have questions, please make corrections*/ Public classBignum { Public Static FinalString Big_num_fmt_comma = "#,###,###,###,###,###,# #0.00";//thousand separators for easy viewing of amount size     Public Static FinalString big_num_fmt = "################# #0.00";//without thousands separators     Public Static FinalString big_num_hundred = "100";//100 Constants     Public Static Final intBig_num_scale = 2;//keep two decimal places    Privatebignum () {}/*** High-precision addition *@paramV1 *@paramv2 *@return     */     Public StaticBigDecimal Add (String v1, String v2) {BigDecimal B1=NewBigDecimal (v1); BigDecimal B2=NewBigDecimal (v2); returnB1.add (B2); }    /*** High Precision subtraction *@paramV1 *@paramv2 *@return     */     Public StaticBigDecimal Sub (String v1,string v2) {BigDecimal B1=NewBigDecimal (v1); BigDecimal B2=NewBigDecimal (v2); returnb1.subtract (B2); }    /*** High precision multiplication *@paramV1 *@paramv2 *@return     */     Public StaticBigDecimal mul (String v1,string v2) {BigDecimal B1=NewBigDecimal (v1); BigDecimal B2=NewBigDecimal (v2); returnb1.multiply (B2); }    /*** High Precision Division *@paramV1 *@paramv2 *@paramScale *@return     */     Public StaticBigDecimal Div (String v1, String v2,intScale ) {        if(Scale < 0) {            Throw NewIllegalArgumentException ("The scale must is a positive integer or zero"); } BigDecimal B1=NewBigDecimal (v1); BigDecimal B2=NewBigDecimal (v2); returnb1.divide (B2, scale, bigdecimal.round_half_up); }    /*** Reserved decimal place *@paramv *@paramScale *@return     */     Public StaticBigDecimal Round (String V,intScale ) {        if(Scale < 0) {            Throw NewIllegalArgumentException ("The scale must is a positive integer or zero"); } BigDecimal b=NewBigDecimal (v); BigDecimal One=NewBigDecimal ("1"); returnb.divide (one, scale, bigdecimal.round_half_up); }    /*** Sub-conversion Narimoto *@paramv *@return     */     Public StaticBigDecimal penny2dollar (String v) {BigDecimal s= Div (V, "100", 2);//keep two decimal places        returns; }    /*** meta-conversion ingredient *@paramv *@return     */     Public StaticBigDecimal Dollar2penny (String v) {returnMul (V, "100"); }    /*** Formatted amount * Thousands separator convenient to view amount specific size big_num_fmt = "#,###,###,###,###,###,# #0.00" * Exact two decimal places. 0.99 * 1111111.985-1,111,111.99 *@paramv *@return     */     Public Staticstring FormatNumber (String v) {returnFormatNumber (V,big_num_fmt_comma); }    /*** Formatted amount *@paramv *@paramconstant BIG_NUM_FMT_COMMA,BIG_NUM_FMT in the pattern bignum class *@return     */     Public Staticstring FormatNumber (string v,string pattern) {return NewDecimalFormat (pattern). Format (new BigDecimal (v)); }     Public Static voidMain (string[] args) {System.out.println (Bignum.add ("1.99", "20.999")); System.out.println (Bignum.sub ("1.99", "20.999")); String s= "1111111.985"; String a=Bignum.formatnumber (s);        System.out.println (s);    System.out.println (a); }}

Java BigDecimal Tool Class