Question

JAVA PROGRAMMING
Implement a class Purse. A purse contains a collection of coins. For simplicity, we will only store the coin names in an ArrayList<String>.

• Supply a method void addCoin(String coinName).
• Add a method toString to the Purse class that prints the coins in the purse in the format Purse[Quarter,Dime,Nickel,Dime].
• Write a method reverse that reverses the sequence of coins in a purse.
• Implement a TestPurse class with a main method in it. It will use the toString method to test your code. For example, if reverse is called with a purse Purse[Quarter,Dime,Nickel,Dime], then the purse is changed to Purse[Dime,Nickel,Dime,Quarter].
• MUST BE TWO SEPERATE CLASSES

IMP: This is what I have so far. Please correct it.

PURSE CLASS:
import java.util.Collections;
import java.util.ArrayList;

public class Purse {

   private ArrayList<String> coins;
  
   public Purse() {
       coins = new ArrayList<String>();
   }

   public void addCoin(String nameofCoin)
   {
      
   }
  
  
   public String toString()
   {
return coins.toString();  
   }
  
   public String reverse()
{
ArrayList<String> pl = new ArrayList<String>(coins);
Collections.reverse(pl);
return pl.toString();
}
}

//TEST PURSE CLASS:

public class TestPurse {

   public static void main(String[] args) {
      
       Purse pu = new Purse();
       pu.addCoin("Dime");
       pu.addCoin("Dime");
       pu.addCoin("Nickel");
       pu.addCoin("Quarter");
      
       System.out.println(pu);
       System.out.println("Expected the Purse: Dime, Dime, Nickel, Quarter");
       System.out.println(pu.reverse());
      

   }

}

Answer 1

//Java code (Try this solution)

import java.util.Collections;
import java.util.ArrayList;

public class Purse {

    private ArrayList<String> coins;

    //Constructor
    public Purse() {
        
        coins = new ArrayList<String>();
    }

    public void addCoin(String nameofCoin)
    {
        //add coin to the arrayList coins using add()
        coins.add(nameofCoin);
    }


    public String toString()
    {
        String result="";
        for (String coin:coins
             ) {
            result+=coin+", ";
        }
        return result;
    }

    public String reverse()
    {
        ArrayList<String> pl = new ArrayList<String>(coins);
        Collections.reverse(pl);
        return pl.toString();
    }
}

//=========================================

public class TestPurse {

    public static void main(String[] args) {

        Purse pu = new Purse();
        pu.addCoin("Dime");
        pu.addCoin("Dime");
        pu.addCoin("Nickel");
        pu.addCoin("Quarter");

        System.out.println(pu);
        System.out.println("Expected the Purse: Dime, Dime, Nickel, Quarter");
        System.out.println(pu.reverse());


    }

}

//Output

//If you need any help regarding this solution ........... please leave a comment ........ thanks