Strings are objects — and they're immutable
String indexing
Essential String methods
length()
substring(int from, int to)
substring(int from)
indexOf(String str)
equals(String other)
compareTo(String other)
Combining methods — real exam patterns
Get the first character
Get the last character
Check if a string starts with something
Reverse traversal of characters
Extract and build
Trace practice — the full workout
String concatenation with +
AP Exam Tips
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Common Mistakes
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