1) How to reverse a string?

Question

Darren Su · Accepted Answer

public class ReversedString {
  public static void main(String[] args) {
      String output = reverse("123456789");
      System.out.println(output);
  }
  private static String reverse(String str) {
        String sb = new StringBuffer(str).reverse().toString();
        return sb;
    }
}

Chris · Answer

In JS:
function reverse(str) {
  return str.split('').reverse().join('');
}

Kemo · Answer

public class ReversedString {
	public static void main(String[] args) {
	StringBuffer sb = new StringBuffer();
	System.out.println(reverse("123456789", sb));
	}

	private static String reverse(String str, StringBuffer sb) {
		if(str.length()==0) {
			return sb.toString();
		}
		sb.append(str.charAt(str.length()-1));
		return reverse(str.substring(0, str.length()-1), sb);
	}
}

Kemo · Answer

public class ReversedString {
	public static void main(String[] args) {
	StringBuffer sb = new StringBuffer();
	System.out.println(reverse("123456789", sb));
	}

	private static String reverse(String str, StringBuffer sb) {
		if(str.length()==0) {
			return sb.toString();
		}
		sb.append(str.charAt(str.length()-1));
		return reverse(str.substring(0, str.length()-1), sb);
	}
}

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