A class SortAlpha has been defined to sort the words in the sentence in alphabetical order…

import java.util.Scanner;

class SortAlpha
{
    String sent;   // the sentence
    int n;         // number of words in the sentence

    // default constructor
    SortAlpha()
    {
        sent = "";
        n = 0;
    }

    // accepts a sentence in upper case and counts its words
    void acceptsent()
    {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a sentence in UPPER CASE: ");
        sent = sc.nextLine().trim().toUpperCase();
        n = sent.split("\\s+").length;
    }

    // sorts the words of P's sentence alphabetically and stores the result in this object
    void sort(SortAlpha P)
    {
        String w[] = P.sent.split("\\s+");
        int len = w.length;
        // bubble sort on the words
        for (int i = 0; i < len - 1; i++)
        {
            for (int j = 0; j < len - 1 - i; j++)
            {
                if (w[j].compareTo(w[j + 1]) > 0)
                {
                    String t = w[j];
                    w[j] = w[j + 1];
                    w[j + 1] = t;
                }
            }
        }
        sent = "";
        for (int i = 0; i < len; i++)
            sent = sent + w[i] + " ";
        sent = sent.trim();
        n = len;
    }

    // displays the original sentence and the sorted sentence
    void display()
    {
        SortAlpha ob = new SortAlpha();
        ob.sort(this);
        System.out.println("Original sentence: " + sent);
        System.out.println("Sorted sentence: " + ob.sent);
    }

    public static void main(String args[])
    {
        SortAlpha obj = new SortAlpha();
        obj.acceptsent();
        obj.display();
    }
}

Enter a sentence in UPPER CASE: THE SKY IS BLUE
Original sentence: THE SKY IS BLUE
Sorted sentence: BLUE IS SKY THE