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更新了convert-a-string-to-an-enum-in-java，增加了一种常用回答 #87

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Sep 14, 2019
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更新了convert-a-string-to-an-enum-in-java，增加了一种常用回答 #87

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34 changes: 33 additions & 1 deletion contents/convert-a-string-to-an-enum-in-java.md
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,38 @@ Enum.valueOf()是否能实现以上目的，如果是，那我如何使用？

### 其他答案

当文本和枚举值不同时，可以采用这种方式：
```java
public enum Blah {
A("text1"),
B("text2"),
C("text3"),
D("text4");

private String text;

Blah(String text) {
this.text = text;
}

public String getText() {
return this.text;
}

public static Blah fromString(String text) {
for (Blah b : Blah.values()) {
if (b.text.equalsIgnoreCase(text)) {
return b;
}
}
return null;
}
}
```
fromString方法中，throw new IllegalArgumentException("No constant with text " + text + " found") 会比直接返回null更优秀.

### 其他答案

我有一个挺赞的工具方法：
```java
/**
Expand Down Expand Up @@ -47,4 +79,4 @@ public static MyEnum fromString(String name) {
}
```

stackoverflow链接：http://stackoverflow.com/questions/604424/convert-a-string-to-an-enum-in-java
stackoverflow链接：http://stackoverflow.com/questions/604424/convert-a-string-to-an-enum-in-java