10 2013 档案

摘要：四舍五入 保留三位小数double a = 12.2345;double b = (double)(Math.round(a*1000))/1000;System.out.println(b);DecimalFormat df = new DecimalFormat("0.000");System.out.println(df.format(b));Java代码Doubledd=0.125;try{DecimalFormatdf=newDecimalFormat("#.##");System.out.println(df.format(dd));}cat 阅读全文