# | Line 145 | Line 145 | package java.util; | |
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145 | * that do allow null elements are strongly encouraged <i>not</i> to | |
146 | * take advantage of the ability to insert nulls. This is so because | |
147 | * {@code null} is used as a special return value by various methods | |
148 | < | * to indicated that the deque is empty. |
148 | > | * to indicate that the deque is empty. |
149 | * | |
150 | * <p>{@code Deque} implementations generally do not define | |
151 | * element-based versions of the {@code equals} and {@code hashCode} |
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