title: Java applying multiply to each item in an array
body: <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>