Sorting methods in the manager class can now be added.
Only part of the manager class is now shown.


/*
 * Super class: Dogs. Subclass: Working dogs
 * Read in from a text file
 */
package inheritance;

public class DogsUI {

    public static void main(String[] args) {
        DogManager dm = new DogManager();
        String text = dm.displayAll();
        System.out.println(text);
        dm.bubbleSortName();
        text = dm.displayAll();
        System.out.println(text);
        dm.bubbleSortAge();
        text = dm.displayAll();
        System.out.println(text);
    }
}
====================================================================

// Sorts alphabetically by the dog's name
    public void bubbleSortName (){
        Dogs temp;
        
        for(int i = 0; i < size - 1; i++){
            for (int j = 0; j < size -1 - i; j++) {
                String name1 = dogArray[j].getName();
                String name2 = dogArray[j + 1].getName();
                int value = name1.compareTo(name2);
                if(name1.compareTo(name2)> 0) {
                    temp = dogArray[j];
                    dogArray[j] = dogArray[j + 1];
                    dogArray[j + 1] = temp;
                } // end if
            } // end inner loop
        } // end outer loop
    } // end method
// ==========================================================================

// Sorts numerically by the dog's age
    public void bubbleSortAge (){
        Dogs temp;
        
        for(int i = 0; i < size - 1; i++){
            for (int j = 0; j < size -1 - i; j++) {
                int age1 = dogArray[j].getAge();
                int age2 = dogArray[j + 1].getAge();
                if(age1 > age2) {
                    temp = dogArray[j];
                    dogArray[j] = dogArray[j + 1];
                    dogArray[j + 1] = temp;
                } // end if
            } // end inner loop
        } // end outer loop
    } // end method
// ===========================================================================

OUTPUTS. 
First by text file. Second alphabetically.
Third by age of the dog.

run:
Butch	2	false
April	1	true
Shaka	2	true	Thabiso
Morgan	4	false
Ratty	9	false
Ricky	1	false	Khutso
Tut	2	true
Seal	1	false	Marge

April	1	true
Butch	2	false
Morgan	4	false
Ratty	9	false
Ricky	1	false	Khutso
Seal	1	false	Marge
Shaka	2	true	Thabiso
Tut	2	true

April	1	true
Ricky	1	false	Khutso
Seal	1	false	Marge
Butch	2	false
Shaka	2	true	Thabiso
Tut	2	true
Morgan	4	false
Ratty	9	false

BUILD SUCCESSFUL (total time: 0 seconds)