01 2016 档案

Java inheritance, composition, encapsulation and polymophism
摘要：Composition means HAS AInheritance means IS A Example: Car has a Engine and Car is a Automobile In programming this is represented as: Encapsulation i 阅读全文

posted @ 2016-01-31 23:31 touchdown 阅读(301) 评论(0) 推荐(0)

Java enum
摘要：An enum type is a special data type that enables for a variable to be a set of predefined constants. The constructor of enum must be private. It means 阅读全文

posted @ 2016-01-29 19:21 touchdown 阅读(142) 评论(0) 推荐(0)

Process's address space and heap
摘要：Typically, in each process, the virtual memory available to that process is called itsaddress space. Each process's address space is typically organiz... 阅读全文

posted @ 2016-01-27 12:03 touchdown 阅读(262) 评论(0) 推荐(0)

HashTable collision
摘要：HashTable is a data structure that maps key to values. No-null object is allowed by both key and value. In the context of a hash table, the term "coll 阅读全文

posted @ 2016-01-25 11:24 touchdown 阅读(213) 评论(0) 推荐(0)

Java final修饰词
摘要：大师傅 阅读全文

posted @ 2016-01-24 22:22 touchdown 阅读(204) 评论(0) 推荐(0)

java final
摘要：浅析Java中的final关键字 谈到final关键字，想必很多人都不陌生，在使用匿名内部类的时候可能会经常用到final关键字。另外，Java中的String类就是一个final类，那么今天我们就来了解final这个关键字的用法。下面是本文的目录大纲： 一.final关键字的基本用法 二.深... 阅读全文

posted @ 2016-01-24 22:20 touchdown 阅读(218) 评论(0) 推荐(0)

（转）Java静态变量，静态类，静态方法
摘要：静态变量和静态方法都属于静态对象，它与非静态对象的差别需要做个说明。 （1）Java静态对象和非静态对象有什么区别？ 比对如下： 静态对象 非静态对象 拥有属性： 是类共同拥有的 是类各对象独立拥有的内存分配： 内存空间上是固定的 空间在各个附属类里面分配 分配顺序： 先分配静态对象的空间 继而再对 阅读全文

posted @ 2016-01-24 21:42 touchdown 阅读(146) 评论(0) 推荐(0)

Return
摘要：return在Java void方法里代表方法的终止。 阅读全文

posted @ 2016-01-24 21:31 touchdown 阅读(146) 评论(0) 推荐(0)

Vector and ArrayList in Java
摘要：Internally, both classes use array. Vector by default double the array size when array is full, while ArrayList increases the array size by 50%.Vector... 阅读全文

posted @ 2016-01-22 13:51 touchdown 阅读(112) 评论(0) 推荐(0)

递推，贪心，动态规划
摘要：DP——“下一步最优是从当前最优得到的”。最优可以是“longest", "shortest"等等。贪心——为了计算最终的最优解，需要计算当前的最优解递推——类似于斐波那契序列作者：王勐链接：http://www.zhihu.com/question/23995189/answer/35429905... 阅读全文

posted @ 2016-01-21 10:56 touchdown 阅读(170) 评论(0) 推荐(0)

复杂度分析
摘要：空间复杂度就是为了支持你的计算所必需存储的状态最多有多少，时间复杂度就是从初始状态到达最终状态中间需要多少步。 阅读全文

posted @ 2016-01-21 10:48 touchdown 阅读(102) 评论(0) 推荐(0)

BST: when to use i <= j or i < j
摘要：i seq, int target){ int lo = 0; int hi = seq.size() - 1; while(lo < hi) { int mid = lo + (hi - lo) / 2; if(seq.get(mid) < t... 阅读全文

posted @ 2016-01-20 22:20 touchdown 阅读(126) 评论(0) 推荐(0)

Interface VS Abstract Class
摘要：An abstract class can have shared state or functionality. An interface is only a promise to provide the state or functionality. A good abstract class ... 阅读全文

posted @ 2016-01-19 23:34 touchdown 阅读(186) 评论(0) 推荐(0)

HashMap VS BST
摘要：HashMap usually performs search operations bounded with complexity of O(1)<=T(n)<=O(n). BST performs search operations in O(logN)<=T(n)<=O(N).HashMap ... 阅读全文

posted @ 2016-01-19 22:37 touchdown 阅读(193) 评论(0) 推荐(0)

vector VS list in C++
摘要：vector is like ArrayList in Java.vector:Continuous memory.Underlying array implementation.Pre-allocate space for future element. This means extra spac... 阅读全文

posted @ 2016-01-19 16:04 touchdown 阅读(172) 评论(0) 推荐(0)

Java ArrayList构造分析
摘要：1 /** 2 * The array buffer into which the elements of the ArrayList are stored. 3 * The capacity of the ArrayList is the length of this... 阅读全文

posted @ 2016-01-19 15:05 touchdown 阅读(406) 评论(0) 推荐(0)

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