不积跬步无以至千里

float mAverageNumber = sum/12; NumberFormat numFormat = NumberFormat.getNumberInstance(); numFormat.setMaximumFractionDigits(2); String str = numFormat.format(mAverageNumber);

http://www.cnblogs.com/deerchao/archive/2006/08/24/zhengzhe30fengzhongjiaocheng.html

北京大学OJhttp://poj.org/http://projecteuler.net/problemshttp://www.topcoder.com/

In this tutorial, it shows the use of java.lang.Comparable andjava.util.Comparator to sort a Java object based on its property value.1. Sort an ArrayTo sort an Array, use the Arrays.sort().

java中的日期处理类总结：Date/Calendar/GregorianCalendar/DateFormat/SimpleDateFormat类1、         Date类（该类现在很少用了）l         Date类对象的创建： n         创建一个当前时间//默认是创建一个代表系统当前日期的Date对象  Date d = new Date(

Two-dimensional arrays as arrays of arraysArrays of arraysJava builds multi-dimensional arrays from many one-dimensional arrays, the so-called "arrays of arrays" approach.There are a couple of