I need help adding an Arraylist to this java code.

import java.util.*; import java.time.LocalDateTime; class Pet { Scanner read = new Scanner(System.in);//Scanner class to read input from reader. private String petType;//attributes private String petName; private int petAge; private int dogSpace; private int catSpace; private int daysStay; private int amountDue; String CheckIn = "No"; String CheckOut = "No"; public Pet(String petType,String petName,int petAge,int daysStay){//public constructor this.petType = petType; this.petName = petName; this.petAge = petAge; this.daysStay = daysStay; } public void checkIn(){ CheckIn = "Yes"; LocalDateTime myObj = LocalDateTime.now(); // Create a date object System.out.println("CheckIn of pet is at :"+myObj); //display time of check in } public void checkOut(){ CheckOut = "Yes"; LocalDateTime myObj = LocalDateTime.now(); // Create a date object System.out.println("CheckOut of pet is at :"+myObj); //display checkout time } public void getPet(){ System.out.println("PetType : "+petType); System.out.println("PetName : "+petName); } public void setPet() { System.out.println("Select 1.To set PetType"+" "+"2. To Set PetName "+" "+"3.To Set PetAge "); int temp = read.nextInt(); switch (temp) { case 1 : System.out.println("Enter the PetType :"); String temp1 = read.nextLine(); petType = temp1; case 2 : System.out.println("Enter the PetName :"); String temp2 = read.nextLine(); petName = temp2; case 3 : System.out.println("Enter the PetAge :"); int temp3 = read.nextInt(); petAge = temp3; } } public void createPet(){ System.out.println("Enter the PetType :"); String Temp4 = read.nextLine(); petType = Temp4; System.out.println("Enter the PetName :"); String Temp5 = read.nextLine(); petName = Temp5; System.out.println("Enter the PetAge :"); int Temp6 = read.nextInt(); petAge = Temp6; } public void updatePet(){ System.out.println("Select 1.To Update PetType"+" "+"2. To Update PetName "+" "+"3.To Update PetAge "+" "+"4. To Update DaysStay"); int temp = read.nextInt(); switch (temp) { case 1 : System.out.println("Enter the PetType :"); String TempPet1 = read.nextLine(); petType = TempPet1; case 2 : System.out.println("Enter the PetName :"); String TempPet2 = read.nextLine(); petName = TempPet2; case 3 : System.out.println("Enter the PetAge :"); int TempPet3 = read.nextInt(); petAge = TempPet3; case 4 : System.out.println("Enter Number of DaysStay:"); int temp4 = read.nextInt(); daysStay = temp4; } } } class Dog extends Pet { public int dogSpaceNbr; public int dogWeight; public String dogGrooming; public Dog(String petType,String petName,int petAge,int daysStay,int dogSpaceNbr,int dogWeight,String dogGrooming){ super(petType,petName,petAge,daysStay); this.dogSpaceNbr = dogSpaceNbr; this.dogWeight = dogWeight; this.dogGrooming = dogGrooming; } Scanner read = new Scanner(System.in); public void getGrooming() { System.out.println("Dog Grooming : "+dogGrooming); } public void setGrooming() { String temp = read.nextLine(); dogGrooming = temp; System.out.println("Dog Grooming : "+dogGrooming); } public void getDogWeight() { System.out.println("Dog Weight : "+dogWeight); } public void setDogWeight() { int temp = read.nextInt(); dogWeight = temp; System.out.println("Dog Weight : "+dogWeight); } public void setdogSpaceNbr() { int temp = read.nextInt(); dogSpaceNbr = temp; System.out.println("Dog SpaceNbr : "+dogSpaceNbr); } public void getdogSpaceNbr() { System.out.println("Dog SpaceNbr : "+dogSpaceNbr); } public void setPet() { super.setPet(); } public void updatePet() { super.updatePet(); } public void getPet() { super.getPet(); } } class Cat extends Pet {//class for Cat public int catSpaceNbr; public int catWeight;//This attributes are optinal because these are not given in uml class but you said "Each class has all attributes" public String catGrooming; public Cat(String PetType,String petName,int petAge,int daysStay,int catSpceNbr,int catWeight,String catGrooming){//constructor for cat super(PetType,petName,petAge,daysStay);//super class constructor to set this.catSpaceNbr = catSpaceNbr; this.catWeight = catWeight; this.catGrooming = catGrooming; } Scanner read = new Scanner(System.in); public void getGrooming() { System.out.println("Cat Grooming : "+catGrooming); } public void setGrooming() { String temp = read.nextLine(); catGrooming = temp; System.out.println("Cat Grooming : "+catGrooming); } public void getDogWeight() { System.out.println("Cat Weight : "+catWeight); } public void setDogWeight() { int temp = read.nextInt(); catWeight = temp; System.out.println("Cat Weight : "+catWeight); } public void setdogSpaceNbr() { int temp = read.nextInt(); catSpaceNbr = temp; System.out.println("Cat SpaceNbr : "+catSpaceNbr); } public void getdogSpaceNbr() { System.out.println("Cat SpaceNbr : "+catSpaceNbr); } public void setPet() { super.setPet(); } public void updatePet() { super.updatePet(); } public void getPet() { super.getPet(); } } public class MyPet { public static void main(String [] args){ Pet pet1 = new Pet("Cat","Boom",3,3);//creating object to pet class with details Dog dog1 = new Dog("Dog","Craze",4,2,10,6,"Yes");//creating object to Dog class with details Type Name Age Stay SpaceNbr Weight Grooming Cat cat1 = new Cat("Cat","Fuz",5,1,11,2,"No");//creating object to Cat class with details Type Name Age Stay SpaceNbr Weight Grooming pet1.getPet(); pet1.checkIn(); } }