Question

Write a program that reads a string from the console, reverses it and prints the result back at the console.

Examples:

Input	Output
sample	elpmas
24tvcoi92	29iocvt42

 

Answer 1

Here's my solution:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Pr_01_ReverseString {
    public static void main(String[] args) throws IOException {

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        String input = reader.readLine();
        StringBuilder sb = new StringBuilder();

        for (int i = input.length() - 1; i >= 0; i--) {//REVERSE ORDER
            sb.append(input.charAt(i));
        }
        System.out.println(sb.toString());
    }
}

Answer 2

Here's another without fori (for iteration):
 

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Pr_01_ReverseString {
    public static void main(String[] args) throws IOException {

        try (BufferedReader bf = new BufferedReader(new InputStreamReader(System.in))) {
            String a = bf.readLine();
            StringBuilder b = new StringBuilder(a);
            b.reverse();
            System.out.println(b);
        }
    }
}