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Having an interface additionally offers a knowledge style for a bag that's autonomous of a specific classification definition. the subsequent chapters will increase diverse 14 bankruptcy 1 luggage implementations of a category of baggage. Code written with recognize to an interface permits us to extra simply exchange one implementation of a bag with one other. directory 1-1 A Java interface for a category of luggage /** An interface that describes the operations of a bag of items. @author Frank M. Carrano */ public interface BagInterface { /** will get the present variety of entries during this bag. @return the integer variety of entries presently within the bag */ public int getCurrentSize(); /** Sees even if this bag is complete. @return precise if the bag is complete, or fake if no longer */ public boolean isFull(); /** Sees even if this bag is empty. @return precise if the bag is empty, or fake if now not */ public boolean isEmpty(); /** provides a brand new access to this bag. @param newEntry the thing to be extra as a brand new access @return precise if the addition is winning, or fake if now not */ public boolean add(T newEntry); /** gets rid of one unspecified access from this bag, if attainable. @return both the got rid of access, if the elimination was once profitable, or null */ public T remove(); /** gets rid of one incidence of a given access from this bag, if attainable. @param anEntry the access to be got rid of @return actual if the removing was once profitable, or fake if no longer */ public boolean remove(T anEntry); /** gets rid of all entries from this bag. */ public void clear(); /** Counts the variety of instances a given access seems during this bag. @param anEntry the access to depend @return the variety of instances anEntry seems to be within the bag */ public int getFrequencyOf(T anEntry); /** checks even if this bag features a given access. @param anEntry the access to find @return real if the bag comprises anEntry, or fake differently */ Using the ADT Bag 15 public boolean contains(T anEntry); /** Creates an array of all entries which are during this bag. @return a newly allotted array of all of the entries within the bag */ public T[] toArray(); } // finish BagInterface 1. 14 After specifying an ADT and writing a Java interface for its operations, you want to write a few Java statements that use the ADT. even supposing we won't execute those statements yet—after all, we've not written a category that implements BagInterface—we can use them to substantiate or revise either our judgements concerning the layout of the tools and the accompanying documentation. during this approach, you fee either the suitability and your figuring out of the standards. it really is greater to revise the layout or documentation of the ADT now, rather than once you have written its implementation. An additional benefit of doing this job conscientiously is for you to use those comparable Java statements later to check your implementation. query 6 Given the complete bag aBag that you simply created in query 1, write a few Java statements that exhibit all the strings in aBag. don't regulate the contents of aBag. Programming Tip Write a try application prior to you enforce a category Writing Java statements that try a class’s tools can help you to totally comprehend the standards for the tools.