程序包 edu.princeton.cs.algs4

类 Stack<Item>

  • 类型参数:
    Item - the generic type of an item in this stack
    所有已实现的接口:
    java.lang.Iterable<Item>
    public class Stack<Item>
extends java.lang.Object
implements java.lang.Iterable<Item>
    The Stack class represents a last-in-first-out (LIFO) stack of generic items. It supports the usual push and pop operations, along with methods for peeking at the top item, testing if the stack is empty, and iterating through the items in LIFO order.

    This implementation uses a singly linked list with a static nested class for linked-list nodes. See LinkedStack for the version from the textbook that uses a non-static nested class. See ResizingArrayStack for a version that uses a resizing array. The push, pop, peek, size, and is-empty operations all take constant time in the worst case.

    For additional documentation, see Section 1.3 of Algorithms, 4th Edition by Robert Sedgewick and Kevin Wayne.

    • 构造器概要

      构造器 
      构造器 说明
      Stack()
      Initializes an empty stack.

    • 方法概要

      修饰符和类型 方法 说明
      boolean isEmpty()
      Returns true if this stack is empty.
      java.util.Iterator<Item> iterator()
      Returns an iterator to this stack that iterates through the items in LIFO order.
      static void main​(java.lang.String[] args)
      Unit tests the Stack data type.
      Item peek()
      Returns (but does not remove) the item most recently added to this stack.
      Item pop()
      Removes and returns the item most recently added to this stack.
      void push​(Item item)
      Adds the item to this stack.
      int size()
      Returns the number of items in this stack.
      java.lang.String toString()
      Returns a string representation of this stack.

      • 从类继承的方法 java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

      • 从接口继承的方法 java.lang.Iterable

        forEach, spliterator

    • 构造器详细资料

      • Stack

        public Stack()
        Initializes an empty stack.

    • 方法详细资料

      • isEmpty

        public boolean isEmpty()
        Returns true if this stack is empty.
        返回:
        true if this stack is empty; false otherwise

      • size

        public int size()
        Returns the number of items in this stack.
        返回:
        the number of items in this stack

      • push

        public void push​(Item item)
        Adds the item to this stack.
        参数:
        item - the item to add

      • pop

        public Item pop()
        Removes and returns the item most recently added to this stack.
        返回:
        the item most recently added
        抛出:
        java.util.NoSuchElementException - if this stack is empty

      • peek

        public Item peek()
        Returns (but does not remove) the item most recently added to this stack.
        返回:
        the item most recently added to this stack
        抛出:
        java.util.NoSuchElementException - if this stack is empty

      • toString

        public java.lang.String toString()
        Returns a string representation of this stack.
        覆盖:
        toString 在类中 java.lang.Object
        返回:
        the sequence of items in this stack in LIFO order, separated by spaces

      • iterator

        public java.util.Iterator<Item> iterator()
        Returns an iterator to this stack that iterates through the items in LIFO order.
        指定者:
        iterator 在接口中 java.lang.Iterable<Item>
        返回:
        an iterator to this stack that iterates through the items in LIFO order

      • main

        public static void main​(java.lang.String[] args)
        Unit tests the Stack data type.
        参数:
        args - the command-line arguments