Specify each method of the class PiggyBank, as given in Listing, by stating the method’s p...

Specify each method of the class PiggyBank, as given in Listing, by stating the method’s purpose; by describing its parameters; and by writing preconditions, postconditions, and a pseudocode version of its header. Then write a Java interface for these methods that includes javadoc-style comments.

LISTING A class of piggy banks

/**A class that implements a piggy bank by using a bag.@author Frank M. Carrano*/public class PiggyBank{  private BagInterfacecoins;  public PiggyBank()   {   coins = new Bag ();   } // end default constructor  public boolean add(Coin aCoin)   {   return coins.add(aCoin);   } // end add  public Coin remove()   {   return coins.remove();   } // end remove  public boolean isEmpty()   {   return coins.isEmpty();   } // end isEmpty} // end PiggyBank