Code printing entire string on each line?

user_13585437 0
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I am trying to write code that will take a given word (in this case "Alphabet") and print it backwards. With my current method, I manage to get it to print backwards, however, instead of printing on character per line, it is printing the entire word, starting with the last character on the first print line and then adding the following character on the next.

public class Main {
    public static void main(String[] args) {
        System.out.println();
        System.out.println();
        String backwards = "Alphabet";
        for (int i = backwards.length(); i >= 0; i--) {
            System.out.println(backwards.substring(i));
        }
        System.out.println();
        System.out.println();
    }
}
java
3 Answers

Change the for loop to start at length() - 1 and use String.charAt(int) instead of String.substring(int). Like,

for (int i = backwards.length() - 1; i >= 0; i--) {
    System.out.println(backwards.charAt(i));
}

Will change your output to

t
e
b
a
h
p
l
A

surrounded by a bunch of empty lines (which I assume you want).

user_29709470

For the record, you can do something like this too (in one line):

String s = "Alphabet";
new StringBuilder(s).reverse().chars().mapToObj(i -> (char) i).forEach(System.out::println);

If, of course, you are in Java 8+.

user_65792650

If you want yo use the method substring() you can do it as below:

for (int i = backwards.length(); i > 0; i--) {
      System.out.println(backwards.substring(i-1, i));
}

If you want to know how this method works take a look here: substring.

user_124603660
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