根據個人經驗，做Android開發的，可能阻塞隊列使用會相對較少，但是有時候看框架源碼經常會碰到，所以有必要學習一下。阻塞隊列裏面的幾個添加和刪除的方法太容易記混了，所以這裏專門總結記錄一下，一個是可以加深自己的記憶，另一個也可以把我的理解分享給大家。
先直接放結論，有興趣的可以再繼續往後看具體的分析
| 添加方法 | add() | offer() | put() |
|---|---|---|---|
| 添加成功 | return true | return true | 無返回 |
| 添加失敗 | 拋異常 | return false | 阻塞等待直到可以插入 |
| 對應刪除方法 | remove() | poll() | take() |
先講一講添加的幾個方法，刪除方案都是跟添加方法一一對應的。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);
往隊列中插入一個元素，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);
往隊列中插入一個元素，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;
往隊列中插入一個元素，如果隊列已滿會阻塞，直到隊列有空餘空間。