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本文探讨了ArrayList的源码实现，讲述了ArrayList的类关系、创建、增删改查、序列化、线程安全

转自：http://www.cnblogs.com/zhangqqqf/archive/2008/09/12/1289730.html C通过运行时堆栈支持递归函数的实现。递归函数就是直接或间接调用自身的函数。      许多教科书都把计算机阶乘和菲波那契数列用来说明递归，非常不幸我们可爱的著名的老潭老师的《C语言程序设计》一书中就是从阶乘的计算开始的函数递归。导致读过这本经书的同学们，看到阶

转自：http://blog.chinaunix.net/uid-26941022-id-3331402.html 计算机科学的新学生通常难以理解递归程序设计的概念。递归思想之所以困难，原因在于它非常像是循环推理（circular reasoning）。它也不是一个直观的过程；当我们指挥别人做事的时候，我们极少会递归地指挥他们。 对刚开始接触计算机编程的人而言，这里有递归的一个简单定义：当

Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without repeating letters for "abcabcbb" is "abc", which the length is 3. Fo

You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a li

Given an array of integers, find two numbers such that they add up to a specific target number. The function twoSum should return indices of the two numbers such that they add up to the target, whe