Java applying multiply to each item in an array
<p>Alright, so I'm trying to create a "sales tax program' where the user can input the items and it adds it to an array, called "costArray".  I only know how to do it, almost, with a String (since I need costArray.length for the loop) but I'm kind of lost.  Can anyone help point me in the right direction so I can: Take an array of numbers (doubles) and apply a multiplier to it (0.08 for sales tax percentage) and output a total number (double)?  Here is what I have so far, can you tell me if I'm close?  Thanks!:</p>

<blockquote>
<pre><code>public class Input
 {
 private Scanner keybd;
 private String item;
 private double cost;
 private String[] costArray;
 private String[] itemArray;
 /**
  * Constructor for objects of class Scanner
  */
public Input(int anyAmountofItems)
{
    keybd = new Scanner(System.in);
    costArray = new String[anyAmountofItems];
    itemArray = new String[anyAmountofItems];
}
/**
 * Mutator method to set the item names and costs
 */
public void setArray(){
    for(int index=0; index &lt; itemArray.length; index++){ 
    System.out.println("Enter the item name: ");
    itemArray[index] = keybd.next();}
    for(int indexa=0; indexa &lt; itemArray.length; indexa++){
        System.out.println(itemArray[indexa]);
    }
    for(int indexb=0; indexb &lt; costArray.length; indexb++){ 
    System.out.println("Enter the item cost: ");
    costArray[indexb] = keybd.next();}
    for(int indexc=0; indexc &lt; costArray.length; indexc++){
        System.out.println(costArray[indexc]);
    }
    }
    /**
     * Accessor method to return the items cost with tax
     */
    public double getTax(){
        return costArray.length;
    }
    //         /**
    //          * Mutator method to calculate tax on each item
    //          */
    //         public void calculateTax(){
    //             for(int index=0; index &lt; costArray.length; index++){
    //                 System.out.println(0.08 * costArray[index]);
    //             }
    //         }
    }
</code></pre>
</blockquote>
