You can iterate through the String and look for a character you seek.
Just use a for loop like this:
String test = "I want to test something";
for(int i=0;i<test.length;i++) {
char t = test.charAt(i);
// do something with char
}
https://docs.oracle.com/javase/7/docs/api/java/lang/String.html#charAt%28int%29
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solved How to get a character index in a string [closed]