title: Java (eclipse) public variables not saving values
body: <p>I am running into some issues with my Java program. We have to create a library, which contains the title(halo, lotr) , the format (xbox, dvd etc), the date loaned (if it is ever loaned), and the person it is loaned to (if it is ever loaned).</p>
  
  <p>I am not complete with my code, however I am testing it out as I go along instead of just compiling the entire finished code after 5 hours of coding. I am running into a problem. Whenever I set a public string variable to a value, it saves in the method I declared it in, but it will display "null" when system.out.print'd in other methods.</p>
  
  <p>heres my code. First class is Library.</p>
  
  <pre><code>package p1;
  import java.util.Scanner;
  public class Library {
  // \/ FIELDS
  private String[] mediaItemTitle = new String[100];
  public String[] mediaItemFormat = new String[100];
  public String[] mediaItemLoanedTo = new String[100];
  public String[] mediaItemOnLoan = new String[100];
  public String[] mediaItemDateLoaned = new String[100];
  public String today = "3/9/2015";
  public int numberOfItems;   
  // /\ FIELDS
  
  // \/ METHODS
  public static void main(String[] brad){
  
      Scanner input = new Scanner(System.in);
  
      MediaItem main;
      main = new MediaItem();
      String title;
      String format;
      String date;
      String name;
  
      for ( int i = 0; i != 5; ){
      i = displayMenu();
      if (i == 1){
          System.out.println("What is the title? ");
          title = input.nextLine();
          System.out.println("What is the format? ");
          format = input.nextLine();
          main.MediaItem(title,format);
  
      }else if (i == 2){
          System.out.println("Which Item (Enter the title? ");
          title = input.nextLine();
          System.out.println("Who are you loaning it to? ");
          name = input.nextLine();
          System.out.println("When did you loan it to them? ");
          date = input.nextLine();
  
      }else if (i == 3){
          main.MediaItem();
      }else if (i == 4){
          System.out.print("Which item? (enter the title) ");
          title = input.nextLine();
          main.markReturned(title);
      }else if (i == 5){ // DONE
          System.out.print("Goodbye!");
          break;
      }
  
      }
  
  }
  public static int displayMenu(){ // DONE
      Scanner input = new Scanner(System.in);
  
      int choice = 0;
      System.out.println("1. Add new item");
      System.out.println("2. Mark an item as on loan");
      System.out.println("3. List all items");
      System.out.println("4. Mark an item as returned");
      System.out.println("5. Quit");
      choice = input.nextInt();
  
  
      return choice;
  }
  public void addNewItem(String title, String format){
      this.mediaItemTitle[numberOfItems] = title;
      this.mediaItemFormat[numberOfItems] = format;
      System.out.print("TEST: " + mediaItemTitle[numberOfItems]);
  
  }
  public void incrementNumberOfItems(){
      numberOfItems++;
  }
  public void listAllItems(){
  for (int i = 0; i &lt; numberOfItems; i++){
  System.out.print(mediaItemTitle[i])
  }
  </code></pre>
  
  <p>}
  Here is the second part of code, my second class MediaItem
      package p1;</p>
  
  <p>public class MediaItem {</p>
  
  <pre><code>// \/ METHODS
  public void MediaItem(){
      Library list;
      list = new Library();
      list.listAllItems();
  
  }
  public void MediaItem(String title, String format){
      Library call;
      call = new Library();
      call.addNewItem(title, format);
      call.incrementNumberOfItems();
  
  }
  
  
  
  // /\ METHODS
  </code></pre>
  
  <p>}</p>
  
  <p>This is driving me insane. I would love to just have me public variables save their value between methods but its not happening. the console (when 3 is chosen from displayMenu)</p>
  
  <p>0
  null</p>
  
  <p>which means numberOfItems and mediaItemTitle[i] are read to be 0, and null. Which I dont understand, because I declared them earlier in the program!!!</p>
  
  <p>I dont understand what Im doing wrong. please help me! Thank you!!</p>