Java Tutorials

Lists

• In addition to the standard collection methods, the List interface allows for random access of elements through its get and set methods.
• List indices are zero based, so list.get(list.size())) is not a valid element.

     List stuff = new ArrayList();
  
     stuff.add("Apple");
     stuff.add("Orange");
  
     // what's the last item? Indexes are zero based!
     System.out.println(stuff.get(stuff.size() - 1));
  
     // change the first item to a pear.  
     stuff.set(0, "Pear");
  
     // now iterate
     Iterator it = stuff.iterator();
  
     while(it.hasNext())
     {
        String item = (String)it.next();
        System.out.println(item);
     }
  

• ListIterator allows element addition, removal, and replacement during iteration.
• The java.util package provides two new List implementations: ArrayList and LinkedList.
• Vector is a legacy class retrofitted to the new Collection framework, and is thread safe.