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charactet set and collation demystified

From mysql doc A character set is a set of symbols and encodings. A collation is a set of rules for comparing characters in a character set. Let's make the distinction clear wit...

2017/02/18 16:37
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Java:WeakReference vs SoftReference vs PhantomReference vs Strong reference

WeakReference and SoftReference were added into Java API from long time but not every Java programmer is familiar with it. Which means there is a gap between where and how to us...

Java:应用Observer接口实现Observer模式

最近在参与一个android项目的时候,看到里面用了Observer这东西,以前还不知道,搜罗了一下,发现一篇讲的简洁清晰的文章,搬来用一下,以后自己好看看: 在Java中通过Observable类和Observe...

2014/11/06 21:25
55
Java enum vs int

When using flags in Java, I have seen two main approaches. One uses int values and a line of if-else statements. The other is to use enums and case-switch statements. I was wond...

2014/11/06 21:25
59
10 Java Regular Expression Examples

1. Username Regular Expression Pattern ^[a-z0-9_-]{3,15}$ ^ # Start of the line [a-z0-9_-] # Match characters and symbols in the list, a-z, 0-9 , underscore , hyphen {3,15} # Le...

2012/12/13 22:29
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