Java Three Letter Words

import java.util.Scanner;


public class GenerateThreeLetterWord {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String characters = input.next();
        char[] chars = characters.toCharArray();

        generateWords(chars);

    }
    public static void generateWords(char[] chars) {
        if (chars.length == 1) {
            for (int i = 0; i < 3; i++) {
                System.out.println(chars[0]);
            }
        }
        else if (chars.length == 2) {
            for (int i = 0; i < chars.length; i++) {
                for (int j = 0; j < chars.length; j++) {
                    System.out.printf("%c%c", chars[i], chars[j]);
                    System.out.println();
                }
            }
        }
        else {
            for (int i = 0; i < chars.length; i++) {
                for (int j = 0; j < chars.length; j++) {
                    for (int h = 0; h < chars.length; h++) {
                        System.out.printf("%c%c%c", chars[i], chars[j], chars[h]);
                        System.out.println();
                    }
                }
            }
        }

    }

}