dcba Reverses string. rev("abcd") - "dcba".

Recursion

AP Computer Science A· difficulty 4/5

public static String rev(String s) {
    if (s.length() <= 1) return s;
    return rev(s.substring(1)) + s.charAt(0);
}
// Call: System.out.println(rev("abcd"));

What is printed?

A
$abcdcba$
B
$abcd$
C
$dcba$
check_circle
D
$dabc$

Explanation

Reverses string. rev("abcd") -> "dcba".

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