KwickClips Java · 41 sec · free
What is the last valid index of a string?
Short answer. length() - 1.
What does charAt(0) return for INDIA?
The character I.
"INDIA"
| Call | Gives |
|---|---|
| charAt(0) | 'I' |
| charAt(4) | 'A' |
| charAt(5) | exception |
Remember
| First index is 0 |
| Last is length() - 1 |
INDIA has five letters. So why does charAt five crash? Index starts at zero. Index zero is I. The last index, four, is A. Index five does not exist. The first index is zero. The last is length minus one.
This clip is from the full lesson: String Programs: Palindrome, Reverse, Extraction and Counting — 7 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: ICSE Class 10 Computer Applications, ICSE Class 10 Computer Applications
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