java 在字符串中查找 / 符号
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Finding a / symbol in string
提问by test
I'm trying to find a forward slash in a string...
我试图在字符串中找到一个正斜杠...
This doesn't seem to work:
这似乎不起作用：
if ("/test".indexOf("/") > -1) {
What am I doing wrong?
我究竟做错了什么？
Funny thing is... I tried this:
有趣的是......我试过这个：
if ("!test".indexOf("!") > -1) {
and it works! I also tried \/ for that... help?
它有效！我也试过 \/ 那个......帮助？
回答by Adam
回答by SLaks
Your say.getText()call is probably returning a string that doesn't start with /.
(See comment)
您的say.getText()呼叫可能返回一个不以/.
（见评论）
For example, it might be starting with ∕(U+2215 DIVISION SLASH), or with a space (or with a \backslash).
例如，它可能以∕(U+2215 DIVISION SLASH)开头，或以空格（或\反斜杠）开头。
EDIT: You have whitespace or a non-printing characterbefore the /. Trust me.
编辑：你有空白或者非打印字符前/。 相信我。
回答by gawi
There must be something else.
一定还有别的东西。
public static void main(String[] args)
{
System.out.println("!test".indexOf("!"));
System.out.println("/test".indexOf("/"));
}
This correctly prints
这正确打印
0
0
回答by user85421
To test if a String starts with a given character, use charAt(0)to get that charracter
要测试字符串是否以给定字符开头，请使用charAt(0)获取该字符
if (text.charAt(0) == '/') {
or startsWith(String)to check for more than one character (a String)
或startsWith(String)检查多个字符（字符串）
if (text.startsWith("/kick ")) {
EDIT:
use trim()to delete leading and trailing spaces if needed:
编辑：
使用trim()删除领先的，如果需要尾随空格：
if (text.trim().charAt(0) == '/') {
