NumberFormat nf   =   NumberFormat.getPercentInstance();
System.out.println(nf.format(0.47));
显示:47% DecimalFormat df1 = new DecimalFormat("##.00%"); //##.00% 百分比格式,后面不足2位的用0补齐
System.out.println(df1.format(fen));
显示:47.00%
05-12 11:16