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  2. Double-ended queue - Wikipedia

    en.wikipedia.org/wiki/Double-ended_queue

    As of Java 6, Java's Collections Framework provides a new Deque interface that provides the functionality of insertion and removal at both ends. It is implemented by classes such as ArrayDeque (also new in Java 6) and LinkedList , providing the dynamic array and linked list implementations, respectively.

  3. Peek (data type operation) - Wikipedia

    en.wikipedia.org/wiki/Peek_(data_type_operation)

    For the stack, priority queue, deque, and DEPQ types, peek can be implemented in terms of pop and push (if done at same end). For stacks and deques this is generally efficient, as these operations are O (1) in most implementations, and do not require memory allocation (as they decrease the size of the data) – the two ends of a deque each ...

  4. Java collections framework - Wikipedia

    en.wikipedia.org/wiki/Java_collections_framework

    Collection implementations in pre-JDK 1.2 versions of the Java platform included few data structure classes, but did not contain a collections framework. [4] The standard methods for grouping Java objects were via the array, the Vector, and the Hashtable classes, which unfortunately were not easy to extend, and did not implement a standard member interface.

  5. Queue (abstract data type) - Wikipedia

    en.wikipedia.org/wiki/Queue_(abstract_data_type)

    Queues may be implemented as a separate data type, or maybe considered a special case of a double-ended queue (deque) and not implemented separately. For example, Perl and Ruby allow pushing and popping an array from both ends, so one can use push and shift functions to enqueue and dequeue a list (or, in reverse, one can use unshift and pop ...

  6. Collection (abstract data type) - Wikipedia

    en.wikipedia.org/wiki/Collection_(abstract_data...

    Oracle PL/SQL implements collections as programmer-defined types [1] Python: some built-in, others implemented in the collections library.NET provides the ICollection and IReadOnlyCollection interfaces and implementations such as List<T>. Rust provides the Vec<T> [2] and HashMap<K, V> [3] structs in the std::collections namespace. [4]

  7. Priority queue - Wikipedia

    en.wikipedia.org/wiki/Priority_queue

    The semantics of priority queues naturally suggest a sorting method: insert all the elements to be sorted into a priority queue, and sequentially remove them; they will come out in sorted order. This is actually the procedure used by several sorting algorithms , once the layer of abstraction provided by the priority queue is removed.

  8. Web crawler - Wikipedia

    en.wikipedia.org/wiki/Web_crawler

    It was written in Java. ht://Dig includes a Web crawler in its indexing engine. HTTrack uses a Web crawler to create a mirror of a web site for off-line viewing. It is written in C and released under the GPL. Norconex Web Crawler is a highly extensible Web Crawler written in Java and released under an Apache License.

  9. clone (Java method) - Wikipedia

    en.wikipedia.org/wiki/Clone_(Java_method)

    clone() is a method in the Java programming language for object duplication. In Java, objects are manipulated through reference variables, and there is no operator for copying an object—the assignment operator duplicates the reference, not the object. The clone() method provides this missing functionality.