Question

To do: Now add code to Pet and PetPlay to complete the comments in the code.

import java.util.ArrayList;

public class PetPlay

{

   //-----------------------------------------------------------------

   // Stores and modifies a list of pets

   //-----------------------------------------------------------------

public static void main (String[] args)

   {

// always make your array lists generic

ArrayList pets = new ArrayList();

pets.add(new Pet("dog", "Bella"));

pets.add(new Pet("cat","Blackie"));

pets.add(new Pet("bird", "Babs"));

pets.add(new Pet("dog", "Lassie"));

pets.add(new Pet("horse", "Sam"));

pets.add(new Pet("dog", "Blackie"));

pets.add(new Pet("turtle", "Joe"));

pets.add(new Pet("bird","Annie"));

pets.add(new Pet("bird", "Alex"));

pets.add(new Pet("bird", "Babs")); //I know she is there twice - we need her later

pets.add(new Pet("cat","Louie"));

pets.add(new Pet("snake","Jake"));

// You could use the following to print out all of the pets

//System.out.println (pets);

// since Java will call the toString() on each individual item if you do not

// but these puts the entire collection in [ ] and we do not want that

// It is better to do it explicitly yourself!!

  

System.out.println("The pets names are: ");

for (int i=0;i

System.out.print(pets.get(i).getName() + " ");

System.out.println();

  

//Let's add Quack the Duck at the second location (remember to start

//counting at zero)

  

pets.add(1,new Pet("duck","Quack"));

System.out.println("With Quack added:");

for (int i=0;i

System.out.print(pets.get(i).getName() + " ");

System.out.println();

  

//Remove Louie the cat. You might try this

Pet p = new Pet("cat", "Louis");

int location = pets.indexOf (p);

System.out.println("\nThe location of Louie is " + location);

System.out.println("This did not work!! See notes in code");

  

// It is looking for the object - not an object with the same values

//for the fields. Since they are not the same object, it is not

//found. Java returns a -1 for the location of unsuccessful searches.

System.out.println("Try again...");

for (int i=0;i

p = pets.get(i);

if (p.getName().equals("Louie") && p.getType().equals("cat"))

pets.remove(i);

}

  

System.out.println("\n Without Louie:");

for (int i=0;i

System.out.print(pets.get(i).getName() + " ");

System.out.println();

  

  

///////NOW YOU FINISH THESE!!!! FIND METHODS FOR THESE!!

  

//Find out the name of the third pet on the list (remember that we start counting at zero). Print it out

System.out.println ("\nThe third pet in the list now is " + pets.get(2));

// Add in the sugar glider named Pete as the fourth

//print out the pets names again

pets.add(3,new Pet("sugar glider","Pete"));

System.out.println("\nWith Pete added as the fourth pet we now have:");

for (int i=0;i

System.out.println(pets.get(i));

//print out how many pets there are now in the collection

System.out.println("\nThe number of pets is now "+ pets.size());

  

// find out the index for the location of Blackie the dog (see notes on line 88)

//find out the index for Babs the bird

//find out the index for Joe the turtle

  

  

// find the indexes for an instance. As we saw, there is no single method to compare the name and type.

// Loop through the array list. Use the method .equals to compare the entries like I did on line 62

// print out the index number if it is equal.

// NOTE: For Strings you cannot use == (this can only be used for primitive data types)

// for objects == checks to see if it is the same object ---not that the contents are the same

  

  

// find all of the pets whose first names start with the letter A.

// Print these. HINT!!! There is

// no single method for this. You will need to loop through the ArrayList getting

// each entry's name and checking to see if the string starts with an A.

  

  

   // print out the list of all of the pet name but all of the letters need to be capitalized.

  

// clear out all the members of the ArrayList

pets.clear();

// print out the ArrayList now and the size now.*/

System.out.println("Size of list :"+pets.size());

  

   }

   }

public class Pet {

private String type;

private String name;

public Pet() {

}

public Pet(String t, String n) {

type = t;

name = n;

}

public String toString() {

return name + " is a " + type;

}

public String getType() {

return type;

}

public void setType(String type) {

this.type = type;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

}

Answer 1

import java.util.ArrayList;

public class PetPlay

{

        // -----------------------------------------------------------------

        // Stores and modifies a list of pets

        // -----------------------------------------------------------------

        public static void main(String[] args)

        {

// always make your array lists generic

                ArrayList<Pet> pets = new ArrayList<>();

                pets.add(new Pet("dog", "Bella"));

                pets.add(new Pet("cat", "Blackie"));

                pets.add(new Pet("bird", "Babs"));

                pets.add(new Pet("dog", "Lassie"));

                pets.add(new Pet("horse", "Sam"));

                pets.add(new Pet("dog", "Blackie"));

                pets.add(new Pet("turtle", "Joe"));

                pets.add(new Pet("bird", "Annie"));

                pets.add(new Pet("bird", "Alex"));

                pets.add(new Pet("bird", "Babs")); // I know she is there twice - we need her later

                pets.add(new Pet("cat", "Louie"));

                pets.add(new Pet("snake", "Jake"));

// You could use the following to print out all of the pets

//System.out.println (pets);

// since Java will call the toString() on each individual item if you do not

// but these puts the entire collection in [ ] and we do not want that

// It is better to do it explicitly yourself!!

                System.out.println("The pets names are: ");

                for (int i = 0; i < pets.size(); i++)

                        System.out.print(pets.get(i).getName() + " ");

                System.out.println();

//Let's add Quack the Duck at the second location (remember to start
//counting at zero)

                pets.add(1, new Pet("duck", "Quack"));

                System.out.println("With Quack added:");

                for (int i = 0; i < pets.size(); i++)

                        System.out.print(pets.get(i).getName() + " ");

                System.out.println();

//Remove Louie the cat. You might try this
                Pet p = new Pet("cat", "Louis");

                int location = pets.indexOf(p);

                System.out.println("\nThe location of Louie is " + location);
                System.out.println("This did not work!! See notes in code");

                // It is looking for the object - not an object with the same values
                //for the fields. Since they are not the same object, it is not
                //found. Java returns a -1 for the location of unsuccessful searches.

                System.out.println("Try again...");

                for (int i = 0; i < pets.size(); i++) {
                        p = pets.get(i);
                        if (p.getName().equals("Louie") && p.getType().equals("cat"))
                                pets.remove(i);
                }

                System.out.println("\n Without Louie:");

                for (int i = 0; i < pets.size(); i++)
                        System.out.print(pets.get(i).getName() + " ");

                System.out.println();
                
                ///////NOW YOU FINISH THESE!!!! FIND METHODS FOR THESE!!
                
                //Find out the name of the third pet on the list (remember that we start counting at zero). Print it out
                System.out.println("\nThe third pet in the list now is " + pets.get(2));

                // Add in the sugar glider named Pete as the fourth
                //print out the pets names again
                pets.add(3, new Pet("sugar glider", "Pete"));

                System.out.println("\nWith Pete added as the fourth pet we now have:");
                for (int i = 0; i < pets.size(); i++)
                        System.out.println(pets.get(i));

                //print out how many pets there are now in the collection
                System.out.println("\nThe number of pets is now " + pets.size());

                // find out the index for the location of Blackie the dog (see notes on line 88)
                int index = -1;
                for (int i = 0; i < pets.size(); i++) {
                        p = pets.get(i);
                        if (p.getName().equals("Blackie") && p.getType().equals("dog"))
                                index = i;
                }
                
                System.out.println("Blackie the dog exists on index " + index);
                
                //find out the index for Babs the bird
                for (int i = 0; i < pets.size(); i++) {
                        p = pets.get(i);
                        if (p.getName().equals("Babs") && p.getType().equals("bird"))
                                index = i;
                }
                
                System.out.println("Babs the bird exists on index " + index);
                
                //find out the index for Joe the turtle
                for (int i = 0; i < pets.size(); i++) {
                        p = pets.get(i);
                        if (p.getName().equals("Joe") && p.getType().equals("turtle"))
                                index = i;
                }
                
                System.out.println("Joe the turtle exists on index " + index);
                
                // find the indexes for an instance. As we saw, there is no single method to compare the name and type.
                
                // Loop through the array list. Use the method .equals to compare the entries like I did on line 62
                // print out the index number if it is equal.
                // NOTE: For Strings you cannot use == (this can only be used for primitive data types)
                // for objects == checks to see if it is the same object ---not that the contents are the same
                
                // find all of the pets whose first names start with the letter A.
                for (int i = 0; i < pets.size(); i++) {
                        p = pets.get(i);
                        if (p.getName().startsWith("A")) {
                                System.out.println(p.getName());
                        }
                }
                
                
                // Print these. HINT!!! There is
                // no single method for this. You will need to loop through the ArrayList getting
                // each entry's name and checking to see if the string starts with an A.
                // print out the list of all of the pet name but all of the letters need to be
                // capitalized.
                for (int i = 0; i < pets.size(); i++) {
                        p = pets.get(i);
                        System.out.println(p.getName().toUpperCase());
                }
                

                // clear out all the members of the ArrayList
                pets.clear();

                // print out the ArrayList now and the size now.*/
                System.out.println("Size of list :" + pets.size());

        }

}

**************************************************

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