HashSet


1   package com.mockobjects;
2   
3   /*
4    * TYPE TO PROVIDE VERY BASIC HASHSET IMPLEMENTATION TO BRIDGE GAP BETWEEN
5    * JDK1.1.7 and JDK 1.2
6    */
7   
8   
9   class HashSet extends java.util.Vector   {
10  
11      /**
12       * ArrayList constructor comment.
13       */
14      public HashSet() {
15          super();
16      }
17  
18      /**
19       * ArrayList constructor comment.
20       * @param initialCapacity int
21       */
22      public HashSet(int initialCapacity) {
23          super(initialCapacity);
24      }
25  
26      /**
27       * ArrayList constructor comment.
28       * @param initialCapacity int
29       * @param capacityIncrement int
30       */
31      public HashSet(int initialCapacity, int capacityIncrement) {
32          super(initialCapacity, capacityIncrement);
33      }
34  
35      public void add(Object   item) {
36          if(!this.contains(item))
37              super.addElement(item);
38      }
39  
40      public void clear() {
41          super.removeAllElements();
42      }
43  
44      public boolean equals(HashSet list) {
45          for (int i = 0; i < list.size(); i++) {
46              if (!this.contains(list.elementAt(i)))
47                  return false;
48          }
49  
50          for (int i = 0; i < size(); i++) {
51              if (!list.contains(this.elementAt(i)))
52                  return false;
53          }
54          return true;
55      }
56  
57      public boolean equals(Object   obj) {
58          if(obj instanceof HashSet)
59              return equals((HashSet)obj);
60          else
61              return false;
62      }
63  
64      public Iterator iterator() {
65          return new Iterator(this);
66      }
67  
68      public Object  [] toArray(Object  [] result) {
69          for(int i=0;i<this.size();i++) {
70              result[i] = this.elementAt(i);
71          }
72  
73          return result;
74      }
75  }
76
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