This is a solution for the Arrage the Strings problem

ArrangeTheString.java

package Challegne;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class ArrangeTheString {

    private static List<String> word;

    public static void main(String[] args) {

        //scanner to read the input
        Scanner inputScanner = new Scanner(System.in);

        String input = inputScanner.nextLine();
        word = getWordsFromString(input);

        //getting the string and display it
        String output = orderSentence();
        System.out.println(output);
    }

    /**
     * this function will tokenize the string into word
     * and return them as a List
     * @param input
     * @return ArrayList
     */
    private static ArrayList<String> getWordsFromString(String input) {
        //trim the string
        input = input.trim();

        //getting reference to the start and the end of a world
        int start = 0;
        int end;

        //the list that will be returned
        ArrayList<String> returnList = new ArrayList<>();

        //analysing the string
        for (int i = 0; i < input.length(); i++) {
            if (input.charAt(i) == ' ') {
                end = i;
                returnList.add(input.substring(start, end));
                start = i + 1;
            }
            if (i == input.length() - 1) {
                returnList.add(input.substring(start, input.length()));
            }
        }

        //and return the list
        return returnList;
    }

    /**
     * this function will create a String builder and sort the
     * list from One to 9
     * @return string
     */
    private static String orderSentence() {

        StringBuilder builder = new StringBuilder();
        for (int i = 0; i < word.size(); i++) {
            int j = 0;
            while (!word.get(j).contains(String.valueOf(i + 1))) {
                j++;
            }
            builder.append(word.get(j)).append(" ");
        }
        return builder.toString();
    }
}