Java計算百分比

 

/** 
     * 獲取百分比
     * 
     *  @param  p1
     *  @param  p2
     *  @return 
      */ 
      public   static  String percent( double  p1,  double  p2)  {
        String str;
         double  p3  =  p1  /  p2;
        NumberFormat nf  =  NumberFormat.getPercentInstance();
        nf.setMinimumFractionDigits( 2 );
        str  =  nf.format(p3);
         return  str;
    }