Java取小数点后两位(N位)的方法归纳

java.text.DecimalFormat df = new java.text.DecimalFormat("#0.##");   double d=3.14159;   System.out.println(df.format(d));java.math.BigDecimal bd = new java.math.BigDecimal("3.14159265");   bd = bd.setScale(2,BigDecimal.ROUND_HALF_UP);class Test{         public static void main(String se77en[]){             double ret = convert(3.14159);             System.out.println(ret);         }                 static double convert(double value){             long l1 = Math.round(value*100);   //四舍五入             double ret = l1/100.0;    //注意：使用100.0而不是100             return ret;         }     }double d = 3.14159;   d = (double)((int)(d*100+0.5))/100;第五种double f = 1.1111;    Double d = Double.valueOf(String.format("%.02f", f));    System.out.println(d);
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