问题描述
是否有办法将 char
变成 String
或 String
用一个字母变成 char
(就像你可以将 int
变成 double
和 double
转换为 int
)? (如果可以,请链接到相关文档)。
Is there a way to turn a char
into a String
or a String
with one letter into a char
(like how you can turn an int
into a double
and a double
into an int
)? (please link to the relevant documentation if you can).
我如何找到这样的东西,我只是在文档中清楚地知道?
How do I go about finding something like this that I'm only vaguely aware of in the documentation?
推荐答案
char firstLetter = someString.charAt(0);
String oneLetter = String.valueOf(someChar);
您可以通过识别可能涉及的类来找到文档。这里,候选人 java.lang.String
和 java.lang.Character
。
You find the documentation by identifying the classes likely to be involved. Here, candidates are java.lang.String
and java.lang.Character
.
您应该首先熟悉:
-
java.lang
-
java.util中的Java Collection框架
- Primitive wrappers in
java.lang
- Java Collection framework in
java.util
它还有助于通过教程更慢地介绍API。
It also helps to get introduced to the API more slowly through tutorials.
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