Please help modify the web application code to calculate a total cost for the selected books.

Current code:

***//SelectionsBeans Class//***

// SelectionsBean.java // Manages a user's topic selections

package sessiontracking;

import java.io.Serializable; import java.util.HashMap; import java.util.Set; import java.util.TreeSet; import javax.faces.bean.ManagedBean; import javax.faces.bean.SessionScoped;

@ManagedBean(name="selectionsBean") @SessionScoped public class SelectionsBeans implements Serializable { // map of topics to book titles private static final HashMap< String, String > booksMap = new HashMap< String, String >();

// intialize booksMap static { booksMap.put("java", "$205 - Java How to Program"); booksMap.put("cpp", "$190 - C++ How to Program"); booksMap.put("iphone", "$430 - iPhone for Programmers: An App-Driven Approach"); booksMap.put("android", "$297 - Android for Programmers: An App-Driven Approach"); } // end static initalizer block

// stores individual user's selections private Set< String > selections = new TreeSet< String >(); private String selection; // stores the current selection private int total=0;

// return number of selections public int getNumberOfSelections() { return selections.size(); }

// returns the currrent selection public String getSelection() { return selection; } // end method getSelection

// store user's selection public void setSelection(String topic) { selection = booksMap.get(topic); selections.add(selection); } // end method setSelection

// return the Set of selections public String[] getSelections() { return selections.toArray(new String[selections.size()]); } // end method getSelections } // end class SelectionsBean

***//index.xhtml//***

Welcome to Sessions!

You have chosen #{selectionsBean.numberOfSelections} selection(s)

Make a Selection and Press Submit

Click here for Check Out Page

***//shoppingcart html//***

Shopping Cart

• #{book}

Click here to choose another topic