dsa

Data Structures & Algorithms - Spring 2018
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ListArrayBasedPlus.java (1266B)

      1 package lab2;
      2 
      3 public class ListArrayBasedPlus extends ListArrayBased {
      4 
      5     public ListArrayBasedPlus() {
      6         super();
      7     }
      8 
      9     public void add(int index, Object item)
     10             throws  ListIndexOutOfBoundsException
     11     {
     12         if (numItems == items.length )  //fixes implementation errors and programming errors.
     13         {
     14             resize();
     15         }  // end if
     16         if (index >= 0 && index <= numItems)
     17         {
     18             super.add(index, item);
     19         }
     20     } //end add
     21 
     22     public void reverse() {
     23         for(int i = 0; i < numItems/2; i++) {
     24             Object tempObject = items[i];
     25             items[i] = items[numItems - i - 1];
     26             items[numItems - i - 1] = tempObject;
     27         }
     28         System.out.println("List reversed");
     29     }
     30 
     31     public void resize() {
     32         Object []tmp;
     33         tmp = new Object[numItems*2 + 1];
     34         for (int i = 0; i < numItems; i++) {
     35             tmp[i] = items[i];
     36         }
     37         items = tmp;
     38     }
     39 
     40     @Override
     41     public String toString() {
     42         String result = "List of size " + size() + " has the following items : ";
     43 
     44         for (int i = 0; i < size(); i++) {
     45             if (items[i] != null)
     46                 result += items[i] + " ";
     47         }
     48 
     49         return result;
     50     }
     51 }