Java中的LinkedBlockingDeque removeFirst（）方法-yiteyi-C++库

这个 removeFirst（） 方法 LinkedBlockingDeque 返回并从中删除Deque容器的第一个元素。该方法抛出了一个 非接触性异常 如果Deque容器是空的。

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语法：

public E removeFirst()

返回： 此方法返回头第一个元素是Deque容器。

例外：函数抛出一个 非接触性异常 如果Deque是空的。

下面的程序演示了LinkedBlockingDeque的removeFirst（）方法：

项目1：

                     // Java Program to demonstrate removeFirst()                   
                     // method of LinkedBlockingDeque                   
                             
                     import                               java.util.concurrent.LinkedBlockingDeque;                   
                     import                               java.util.*;                   
                             
                     public                               class                               GFG {                   
                                         public                               static                               void                               main(String[] args)                   
                                         throws                               InterruptedException                   
                                         {                   
                             
                                         // create object of LinkedBlockingDeque                   
                                         LinkedBlockingDeque<Integer> LBD                   
                                         =                               new                               LinkedBlockingDeque<Integer>();                   
                             
                                         // Add numbers to end of LinkedBlockingDeque                   
                                         LBD.add(                               7855642                               );                   
                                         LBD.add(                               35658786                               );                   
                                         LBD.add(                               5278367                               );                   
                                         LBD.add(                               74381793                               );                   
                             
                                         // print Dequee                   
                                         System.out.println(                               "Linked Blocking Deque: "                               + LBD);                   
                             
                                         // removes the front element and prints it                   
                                         System.out.println(                               "First element of Linked Blocking Deque: "                   
                                         + LBD.removeFirst());                   
                             
                                         // prints the Deque                   
                                         System.out.println(                               "Linked Blocking Deque: "                               + LBD);                   
                                         }                   
                     }                   

输出：

Linked Blocking Deque: [7855642, 35658786, 5278367, 74381793]

First element of Linked Blocking Deque: 7855642

Linked Blocking Deque: [35658786, 5278367, 74381793]

项目2：

                     // Java Program to demonstrate removeFirst()                   
                     // method of LinkedBlockingDeque                   
                             
                     import                               java.util.concurrent.LinkedBlockingDeque;                   
                     import                               java.util.*;                   
                             
                     public                               class                               GFG {                   
                                         public                               static                               void                               main(String[] args)                   
                                         throws                               NoSuchElementException                   
                                         {                   
                             
                                         // create object of LinkedBlockingDeque                   
                                         LinkedBlockingDeque<Integer> LBD                   
                                         =                               new                               LinkedBlockingDeque<Integer>();                   
                             
                                         // print Dequee                   
                                         System.out.println(                               "Linked Blocking Deque: "                               + LBD);                   
                             
                                         try                               {                   
                                         // throws an exception                   
                                         LBD.removeFirst();                   
                                         }                   
                                         catch                               (Exception e) {                   
                                         System.out.println(                               "Exception when removing "                   
                                         +                               "first element from this Deque: "                   
                                         + e);                   
                                         }                   
                                         }                   
                     }                   

输出：

Linked Blocking Deque: []
Exception when removing first element from this Deque: java.util.NoSuchElementException

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