Unit 2 Day 17 String Algorithms
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Unit 2: Selection and Iteration
Day 17 PracticeMedium
Focus: String traversal and manipulation
Today's Question
What is returned by mystery("hello")?
class="apcs-keyword">public static String mystery(String s) {
String result = class="apcs-string">"";
for (int i = s.length() - 1; i >= 0; i--) {
result += s.charAt(i);
}
return result;
}The loop traverses the string backward (from index 4 to 0), appending each character to result. This reverses the string: "olleh".
Key Concept
Traversing a string backward by starting at length()-1 and decrementing is a common pattern for reversing strings.