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                >[success] # Queue集合 1. `java.util.Queue`集合是Collection集合的子集合,與List集合屬于平級關系。 2. 主要用于描述具有先進先出特征的數據結構,叫做**隊列**(fifirst in fifirst out FIFO)。 3. 主要實現類是**LinkedList**類,因為該類在增刪方面比較有優勢 >[danger] ##### 常用方法 |方法聲明 |功能介紹| |--|--| |boolean offer(E e) |將一個對象添加至隊尾,若添加成功則返回true| |E poll() |從隊首刪除并返回一個元素| |E peek()| 返回隊首的元素(但并不刪除)| ~~~ import java.util.LinkedList; import java.util.Queue; public class QueueTest { public static void main(String[] args) { // 1.準備一個Queue集合并打印 Queue queue = new LinkedList(); System.out.println("隊列中的元素有:" + queue); // [啥也沒有] System.out.println("----------------------------------------------------------"); // 2.將數據11、22、33、44、55依次入隊并打印 for (int i = 1; i <= 5; i++) { boolean b1 = queue.offer(i * 11); //System.out.println("b1 = " + b1); System.out.println("隊列中的元素有:" + queue); // 11 22 33 44 55 } System.out.println("----------------------------------------------------------"); // 3.然后查看隊首元素并打印 System.out.println("對首元素是:" + queue.peek()); // 11 System.out.println("----------------------------------------------------------"); // 4.然后將隊列中所有數據依次出隊并打印 int len = queue.size(); for (int i = 1; i <= len; i++) { System.out.println("出隊的元素是:" + queue.poll()); // 11 22 33 44 55 } System.out.println("----------------------------------------------------------"); // 5.查看隊列中最終的元素 System.out.println("隊列中的元素有:" + queue); // [啥也沒有] } } ~~~
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