浮点数取两位小数

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String str;         do{             Scanner scanner = new Scanner(System.in);             System.out.println("请输入年利率数字部分（如年利率为8.5%，则输入8.5即可.）");             str = scanner.nextLine();             float fff = (Float.parseFloat(str)*100)/360;             System.out.println("变形前：>>>>>"+fff+"");             System.out.println("万份日收益为：Math.round>>>>>"+(double)(Math.round(fff*100)/100.0)+"元");             System.out.println("万份日收益为：format>>>>>"+String.format("%.2f",fff));             DecimalFormat df = new DecimalFormat("#.##");             System.out.println("万份日收益为：DecimalFormat>>>>>"+Double.parseDouble(df.format(fff))+"    之前>>>>>"+df.format(fff));             System.out.println("万份日收益为：double>parseString>>>>>"+Double.parseDouble(String.format("%.2f", fff)));             BigDecimal bd = new BigDecimal(fff);             BigDecimal bd2 = bd.setScale(3, BigDecimal.ROUND_HALF_UP);             System.err.println("1111万份日收益为：BigDecimal>>>>>"+bd2.toString()+"   Double.parse>>>>>"+Double.parseDouble(bd2.toString()));         }while(true);