My program needs to read a string and process each character, one at a time. I don't want to put the string into a char array, so is there any way to check for the end of the string without doing this? I tried to do this (where s is a String): s.charAt(index) != null as a condition for a while loop, but I shortly figured out that this obviously doesn't work, because you just can't use != with char and null. Is there any other way?
6 Answers
You could try comparing your index variable to s.length():
while (index < s.length()) {
//process
}
Comments
You don't need to "put the string into a char array", you can use the string length as a limiter, and charAt to process each character:
for (int chPos = 0; chPos < str.length(); chPos++)
doSomethingWith (str.charAt(chPos));
Comments
You need to use String's .length() method.
String s = "test";
for(int i=0; i < s.length ; i++){
char c = s.charAt(i);
}
Comments
You can use the String's method length to check the size of the string. for example:
for(int i = 0; i < s.length(); i++) {
char h = s.charAt(i);
//process h
}
Comments
The simplest loop through a string one character at a time would simply use the length of the string to handle this. For example:
if (inputString != null) {
for (int i=0; i < imputString.length(); i++) {
theChar = inputString.charAt(i);
...
}
}
Comments
- Use a for loop to iterate through all characters in the String until you get to String.length()
- Use a foreach loop to iterate through all characters that are returned from String.getBytes()
6 Comments
jahroy
Seems like a senseless reason to throw an Ecxception. Why not just iterate over the each element after determining the length of the string.
Jason
Edited to offer options.
jahroy
Remove the try/catch approach and I'll remove my downvote. You should not use Exceptions in this scenario.
Jason
I will remove, however it is a valid demonstration of technique, even if not for this exact example.
jahroy
It is a possible approach, but it's a bad option here. We shouldn't teach the newb bad habits ;-)
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for (int index = 0; index < s.length(); index++)...s.length()to determine the length of the string!!