Throwing Exceptions

[x-ice]

Can i use the throws clause on a static method?

Here is my code, it has an error in it.

import java.util.ArrayList;
import java.util.Iterator;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

/**
 * Store items
 * 
 * @author Daniel Morgan [362724]
 * @version 1.0
 */

public class Library
{
    private static ArrayList theItems;

    /**
     * Create a library
     */
    public Library()
    {
        //ArrayList that will store all the new items
        theItems = new ArrayList();
    }
    
    /**
     * Run from command line
     */
    public static void main()
    {
        //Create a new library
        Library newLib = new Library();
        //Start command interface
        retrieveInput();
    }

    /**
     * Create a new item and add it to the library arraylist
     * 
     * @param Name The name of the item
     * @param cost The cost of the item
     */
    public static void createItem(String Name, int cost)
    {
        //Create a new instance of an item
        Item newItem = new Item(Name, cost);      
        //Add it to the array list
        theItems.add(newItem);
    }
    
    /**
     * Print all items in the library
     */
    public static void printAll()
    {
        //Create an iterator
        Iterator itCount = theItems.iterator();
        //Loop through all items in the library
        while(itCount.hasNext())
        {
            Item currentItem = (Item)itCount.next();
            //Print the item details
            currentItem.print();
        }        
    }
    
    
    /**
     * Retrieve the user input and provide the command interface
     * 
     * @throws IOException
     */    
    public static void retrieveInput() throws IOException
    {
        //The input reader
	    BufferedReader usrInput = new BufferedReader(new InputStreamReader(System.in));
	    //'Name' and 'Cost' variables
	    String itemName = "";
	    String inputAnswer= "";
	    int itemCost = 0;
	    Boolean contInput = true;
	    
	    while(contInput = true)
	    {
    	    //Prompt user to create a new item
    	    System.out.println("Do you want to create an item? (Yes or No)"); System.out.println("> ");
    	    //Read input
    	    inputAnswer = usrInput.readLine();
    	    //Check input
    	    if(inputAnswer.toLowerCase().equals("yes"))
    	    {
    	        //Prompt user for item 'Name'
    	        System.out.println("Item name?"); System.out.println("> ");
    	        //Read input
    	        itemName = usrInput.readLine();
    	        //Prompt user for item 'Cost'
    	        System.out.println("Item Cost?"); System.out.println("> ");
    	        itemCost = Integer.parseInt(usrInput.readLine());
    	        //Create the item
    	        createItem(itemName, itemCost);
    	        //Notify user of success
    	        System.out.println("Item created successfully");
    	        //Print a blank line, for presentation purposes
    	        System.out.println();
    	    }//End If
    	    	    
    	    //Prompt the user to print all items
    	    System.out.println("Do you want to print all items? (Yes or No)"); System.out.println("> ");
    	    //Read input
    	    inputAnswer = usrInput.readLine();
    	    //Check input
    	    if(inputAnswer.toLowerCase().equals("yes"))
    	    {
    	        //Print all items
    	        printAll();
    	        //Print a blank line, for presentation purposes
    	        System.out.println();
    	    }//End If
    	    
    	    //Repeater
    	    System.out.println("Repeat this process? (Yes or No)"); System.out.println("> ");
    	    //Read input
    	    inputAnswer = usrInput.readLine();
    	    //Check input
    	    if(inputAnswer.toLowerCase().equals("yes"))
    	    {
    	        //Set continue flag
    	        contInput = true;
    	    }
    	    else
    	    {
    	        //Set continue flag
    	        contInput = false;
    	    }//End If
	    }//End While
    }
    
}

The error is in the line highlighted in bold. The error is:

Unreported exception java.io.IOException; must be caught or declared to be thrown.