根據(jù)個(gè)人經(jīng)驗(yàn)，做Android開發(fā)的，可能阻塞隊(duì)列使用會(huì)相對(duì)較少，但是有時(shí)候看框架源碼經(jīng)常會(huì)碰到，所以有必要學(xué)習(xí)一下。阻塞隊(duì)列里面的幾個(gè)添加和刪除的方法太容易記混了，所以這里專門總結(jié)記錄一下，一個(gè)是可以加深自己的記憶，另一個(gè)也可以把我的理解分享給大家。

先直接放結(jié)論，有興趣的可以再繼續(xù)往后看具體的分析

先講一講添加的幾個(gè)方法，刪除方案都是跟添加方法一一對(duì)應(yīng)的。我們先看一下BlockingQueue中的添加方法說明

    /**
     * Inserts the specified element into this queue if it is possible to do
     * so immediately without violating capacity restrictions, returning
     * {@code true} upon success and throwing an
     * {@code IllegalStateException} if no space is currently available.
     * When using a capacity-restricted queue, it is generally preferable to
     * use {@link #offer(Object) offer}.
     *
     * @param e the element to add
     * @return {@code true} (as specified by {@link Collection#add})
     * @throws IllegalStateException if the element cannot be added at this
     *         time due to capacity restrictions
     * @throws ClassCastException if the class of the specified element
     *         prevents it from being added to this queue
     * @throws NullPointerException if the specified element is null
     * @throws IllegalArgumentException if some property of the specified
     *         element prevents it from being added to this queue
     */
    boolean add(E e);

往隊(duì)列中插入一個(gè)元素，插入成功則返回true，插入失敗則拋出異常。

    /**
     * Inserts the specified element into this queue if it is possible to do
     * so immediately without violating capacity restrictions, returning
     * {@code true} upon success and {@code false} if no space is currently
     * available.  When using a capacity-restricted queue, this method is
     * generally preferable to {@link #add}, which can fail to insert an
     * element only by throwing an exception.
     *
     * @param e the element to add
     * @return {@code true} if the element was added to this queue, else
     *         {@code false}
     * @throws ClassCastException if the class of the specified element
     *         prevents it from being added to this queue
     * @throws NullPointerException if the specified element is null
     * @throws IllegalArgumentException if some property of the specified
     *         element prevents it from being added to this queue
     */
    boolean offer(E e);

往隊(duì)列中插入一個(gè)元素，插入成功則返回true，插入失敗則返回false。

    /**
     * Inserts the specified element into this queue, waiting if necessary
     * for space to become available.
     *
     * @param e the element to add
     * @throws InterruptedException if interrupted while waiting
     * @throws ClassCastException if the class of the specified element
     *         prevents it from being added to this queue
     * @throws NullPointerException if the specified element is null
     * @throws IllegalArgumentException if some property of the specified
     *         element prevents it from being added to this queue
     */
    void put(E e) throws InterruptedException;

往隊(duì)列中插入一個(gè)元素，如果隊(duì)列已滿會(huì)阻塞，直到隊(duì)列有空余空間。