问题描述
有没有办法把一个 char 变成一个 String 或一个带有一个字母的 String 变成一个 char (例如如何将 int 转换为 double 并将 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).
我如何才能找到我在文档中只是模糊地知道的类似内容?
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查找文档.在这里，候选是 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 中的原始包装器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.
- 处理字符串中的字符
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