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Merge pull request giantray#44 from tangculijier/master

Create onvert-a-string-to-an-enum-in-java.md

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	`1`	`+##在java中把String转换给enum类`
	`2`	`+-------------------------------------`
	`3`	`+`
	`4`	`+###问题`
	`5`	`+假设有有个枚举类:`
	`6`	+```java
	`7`	`+public enum Blah`
	`8`	`+{`
	`9`	`+ A, B, C, D`
	`10`	`+}`
	`11`	+```
	`12`	`+现在我想把这个String转成枚举类,比如说"A"应该等于Blash.A.该怎么做?`
	`13`	`+`
	`14`	`+------`
	`15`	`+###回答1`
	`16`	+```java
	`17`	`+Blah A = Blah.valueOf("A");`
	`18`	+```
	`19`	`+这样传入"A"会返回Balsh枚举类.`
	`20`	`+###回答2`
	`21`	+```java
	`22`	`+Blah A =Enum.valueOf(Blah.class, "A");`
	`23`	+```
	`24`	`+同样可以得到该枚举类`
	`25`	`+`
	`26`	`+这两个方法都会传入的参数大小写敏感,这个例子如果传入"a",则会报错No enum const class Blah.a.`
	`27`	`+`
	`28`	`+stackoverflow原址: http://stackoverflow.com/questions/604424/convert-a-string-to-an-enum-in-java`
	`29`	`+`
	`30`	`+`

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