在 Java 中，如何将 String 转换为 char 或将 char 转换为 String？
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In Java how does one turn a String into a char or a char into a String?
提问by David
Is there a way to turn a charinto a Stringor a Stringwith one letter into a char(like how you can turn an intinto a doubleand a doubleinto an int)? (please link to the relevant documentation if you can).
有没有办法把 achar变成 aString或 aString用一个字母变成 a char（就像你如何把 anint变成 adouble和 adouble变成 an int）？（如果可以，请链接到相关文档）。
How do I go about finding something like this that I'm only vaguely aware of in the documentation?
我如何去寻找这样的东西，我只是在文档中模糊地知道？
采纳答案by polygenelubricants
char firstLetter = someString.charAt(0);
String oneLetter = String.valueOf(someChar);
You find the documentation by identifying the classes likely to be involved. Here, candidates are java.lang.Stringand java.lang.Character.
您可以通过识别可能涉及的类来查找文档。在这里，候选人是java.lang.String和java.lang.Character。
You should start by familiarizing yourself with:
您应该首先熟悉：
- Primitive wrappers in
java.lang - Java Collection framework in
java.util
- 原始包装器
java.lang - Java Collection 框架中的
java.util
It also helps to get introduced to the API more slowly through tutorials.
它还有助于通过教程更缓慢地介绍 API。
回答by BryanD
String.valueOf('X')will create you a String "X"
String.valueOf('X')将为您创建一个字符串 "X"
"X".charAt(0)will give you the character 'X'
"X".charAt(0)会给你性格 'X'
回答by Roman
I like to do something like this:
我喜欢做这样的事情：
String oneLetter = "" + someChar;
回答by fastcodejava
String someString = "" + c;
char c = someString.charAt(0);
回答by helpermethod
As no one has mentioned, another way to create a String out of a single char:
正如没有人提到的，另一种从单个字符创建字符串的方法：
String s = Character.toString('X');
Returns a String object representing the specified char. The result is a string of length 1 consisting solely of the specified char.
返回表示指定字符的 String 对象。结果是长度为 1 的字符串，仅由指定的字符组成。
回答by MyUserQuestion
String g = "line";
//string to char
char c = g.charAt(0);
char[] c_arr = g.toCharArray();
//char to string
char[] charArray = {'a', 'b', 'c'};
String str = String.valueOf(charArray);
//(or iterate the charArray and append each character to str -> str+=charArray[i])
//or String s= new String(chararray);
//或 String s= new String(chararray);
回答by Santosh Kulkarni
In order to convert string to char
为了将字符串转换为字符
String str = "abcd";
char arr [] = new char[len]; // len is the length of the array
arr = str.toCharArray();
