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| <span class="returntype">int</span> |
| <span class="name ">hashCode</span></section> |
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| <section class="desc markdown"> |
| <p>The hash code for this object.</p> |
| <p>A hash code is a single integer which represents the state of the object |
| that affects <code>==</code> comparisons.</p> |
| <p>All objects have hash codes. |
| The default hash code represents only the identity of the object, |
| the same way as the default <code>==</code> implementation only considers objects |
| equal if they are identical (see <code>identityHashCode</code>).</p> |
| <p>If <code>==</code> is overridden to use the object state instead, |
| the hash code must also be changed to represent that state.</p> |
| <p>Hash codes must be the same for objects that are equal to each other |
| according to <code>==</code>. |
| The hash code of an object should only change if the object changes |
| in a way that affects equality. |
| There are no further requirements for the hash codes. |
| They need not be consistent between executions of the same program |
| and there are no distribution guarantees.</p> |
| <p>Objects that are not equal are allowed to have the same hash code, |
| it is even technically allowed that all instances have the same hash code, |
| but if clashes happen too often, it may reduce the efficiency of hash-based |
| data structures like <code>HashSet</code> or <code>HashMap</code>.</p> |
| <p>If a subclass overrides <code>hashCode</code>, it should override the |
| <code>==</code> operator as well to maintain consistency.</p> |
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