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

这个 takeFirst（） 方法 LinkedBlockingDeque 返回并从中删除Deque容器的第一个元素，如有必要，等待该元素可用。。该方法抛出了一个 中断异常 如果在等待时被打断。

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语法：

public E takeFirst()

返回： 此方法返回 第一要素 如有必要，等待元素可用。

例外：函数抛出一个 中断异常 如果在等待时被打断。

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

项目1：

                     // Java Program to demonstrate takeFirst()                   
                     // 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 Dequeue                   
                                         System.out.println(                               "Linked Blocking Deque: "                               + LBD);                   
                             
                                         // removes the front element and prints it                   
                                         System.out.println(                               "Head of Linked Blocking Deque: "                   
                                         + LBD.takeFirst());                   
                             
                                         // prints the Deque                   
                                         System.out.println(                               "Linked Blocking Deque: "                               + LBD);                   
                                         }                   
                     }                   

输出：

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

项目2： 演示中断异常

                       // Java Program to demonstrate takeFirst()                     
                       // 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 Dequeue                     
                                             System.out.println(                                  "Linked Blocking Deque: "                                  + LBD);                     
                                
                                             LBD.clear();                     
                                
                                             // throws error as the list is empty and it                     
                                             // is interrupted while waiting                     
                                             System.out.println(                                  "Head of Linked Blocking Deque: "                     
                                             + LBD.takeFirst());                     
                                             }                     
                       }                     

运行时错误：

Max real time limit exceeded due to either by heavy load on server or by using sleep function

参考： https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedBlockingDeque.html#takeFirst–

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