Growth Level

Section 5.3 Growth Level

Objectives

Accessing data in ArrayLists with a for-loop

Subsection 5.3.1 Instructions

The following program requires you to write a method to locate duplicates within an ArrayList containing Animal objects. A "duplicate" refers to an Animal with the same name as another Animal that is already in the list. That is, if an Animal with a particular name already exists in the ArrayList, any subsequent Animal with the exact same name is considered a duplicate.

public class Animal {
  //**TO-DO: Initialize a static ArrayList here called allAnimals**
  String name;
  String type;

  public Animal(String name, String type){
      this.name = name;
      this.type = type;
      allAnimals.add(this);
  }

  public String toString(){
      return name + " (" + type + ")";
  }

  //**TO-DO: Write method that checks if an animal in the list**
  public static boolean isDuplicate(String nameToCheck){
  
  }
}

The program contains a class named Animal, where each instance represents an individual animal that is characterized by a name and a type. Each animal that is created is added to a static ArrayList allAnimals. You may assume that all names begin with a capital letter.

import java.util.ArrayList;
public class Animal {

//**TO-DO: Initialize a static ArrayList here called allAnimals**
    String name;
    String type;

public Animal(String name, String type){
        this.name = name;
        this.type = type;
        allAnimals.add(this);
    }

public String toString(){
        return name + " (" + type + ")";
    }

//**TO-DO: Write method that checks if an animal in the list**
    public static boolean isDuplicate(String nameToCheck){
    
    }

public static void main(String[] args){

// ----- DO NOT CHANGE -----

//Creating animals..
        Animal greg = new Animal("Greg", "giraffe");
        Animal alice = new Animal("Alice", "aardvark");
        Animal reggie = new Animal("Reggie", "raccoon");
        Animal orville = new Animal("Orville", "ostrich");
        Animal paul = new Animal("Paul", "piranha");
        Animal harry = new Animal("Harry", "hippo");

//Testing method..
        Animal.isDuplicate("Alice");
        Animal.isDuplicate("George");
        Animal.isDuplicate("Timothy");
        Animal.isDuplicate("Paul");
        Animal.isDuplicate("Orville");
        Animal.isDuplicate("Oliver");

// ----- DO NOT CHANGE -----
    }
}

The expected output is:

DUPLICATE: There is already an animal with the name "Alice" in the list: Alice (aardvark)
UNIQUE: The name George is unique.
UNIQUE: The name Timothy is unique.
DUPLICATE: There is already an animal with the name "Paul" in the list: Paul (piranha)
DUPLICATE: There is already an animal with the name "Orville" in the list: Orville (ostrich)
UNIQUE: The name Oliver is unique.

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