WA!Peter

if you miss the source attachment, and do not want to download the whole new J2EE version, try this:

ftp://ftp.osuosl.org/pub/eclipse/eclipse/updates/3.6/R-3.6.2-201102101200/plugins/

Grab:
org.junit.source_3.8.2.v3_8_2_v20100427-1100.jar

Most of these instruction is using root access
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when the network card does not auto connect to the network router:
ethtool -s eth0 autoneg off
ref: http://ubuntuforums.org/showthread.php?t=880664
it happens on my Asus mainboard with built-in

- CentOS 5.6  is running on GLIBC 2.5, which does not support Android SDK start
  (can download, can install, but cannot launch emulator)
  note:  error message is like:  libc.so.6 error require GLIBC_2.7, and we don't want to build
  Android SDK from scratch

- Ubuntu 11.4 (probably Debian too) is using newer version of GLIBC, so it runs the official Android

SOLID 是一种 Object-Oriented 的设计模式, 有些部分我很认同， 这里记录:

SOLID on wiki:
http://en.wikipedia.org/wiki/Solid_(object-oriented_design)

S : SRP Single responsibility principle, 做一件事情， 越简单越好
O : OCP Open/closed principle : a class is open for extension, 但是 closed for modification - 可以修改bug, 肯定的
L : LSP  Liskov substitution principle (Liskov 是提出这个想法的学者), 任何一处程序， 如果能处理

-----问题定义-----

假设现在有两个坐标， 以(x1, y1)  和 (x2, y2) 分别代表坐标1和坐标2.

定义坐标1指向坐标2的方向(direction): 上UP， 右RIGHT， 下DOWN， 左LEFT 分别为常数 0, 1, 2, 3

上的定义为 y2-y1=1    x2-x1=0

下的定义为 y2-y1=-1    x2-x1=0

左的定义为 y2-y1=0    x2-x1=-1

右的定义为 y2-y1=0    x2-x1=1

此方向正好是套用Cartesian coordinate system  （y 向上越大， x向右越大)

original 原文: http://gamerboom.com/archives/11793

Tony Ventrice：以休闲的理念架构和设计社交游戏（长篇）
Examines the difference between hardcore and casual play mechanics -- and dispels commonly-held myths about which are which

note: 建议看多一次英文版， 有些轻微的翻译错误导致意思不完整， 例如:

2. Overwhelming options  -> 2. 无法抗拒的设置

应该翻译为 "过多的设置"