Java · Question 9 · Medium

What will be the output of the following Java program?

public class Main {
    public static void main(String[] args) {
        StringBuilder sb = new StringBuilder("abc");
        sb.append("de").reverse();
        System.out.println(sb);
    }
}
  1. edcba
  2. abcde
  3. cbade
  4. edc
Answer and explanation

Answer: A. edcba

Explanation: StringBuilder is mutable: append changes sb to "abcde" and reverse() then reverses the same object in place, giving "edcba".

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