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BasicJava~5 min

Java: reverse a string without StringBuilder.reverse()

Java automation / SDET interview rounds

Points available

100/100

Your mission

  1. Read
  2. 2Run
  3. 3Submit
  4. 4Solve

Write static String reverse(String s) that returns the string reversed.

Do not use StringBuilder.reverse().

Examples

reverse("hello") → "olleh"

Real Java 8 runs in your browser. Write your code in class Solution; java.util, java.util.stream and java.util.function are imported for you. The first run loads Java and can take 10–20 seconds.

Hints

Each hint costs 10 points on a full solve.

Interviewer follow-ups

  • What is the time and space complexity?
  • Which edge cases would you test?

Ctrl+Enter to run · add Shift to submit

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Tab inserts two spaces. Press Escape, then Tab, to leave the editor.
Terminal

$ javac Main.java && java Main

Run executes the open file. Submit scores solution.java against hidden tests.

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