Java中的ConcurrentSkipListSet pollLast（）方法-yiteyi-C++库

这个 pollLast（） 方法 JAVAutil。同时发生的ConcurrentSkipListSet 是Java中的一个内置函数，它返回并删除最后一个（最高）元素，如果该集合为空，则返回null。

null

语法：

public E pollLast()

返回值： 函数返回并移除最后一个（最高）元素，如果该集合为空，则返回null。

下面的程序演示了ConcurrentSkipListSet。pollLast（）方法：

项目1：

                     // Java program to demonstrate pollLast()                   
                     // method of ConcurrentSkipListSet                   
                             
                     import                               java.util.concurrent.*;                   
                             
                     class                               ConcurrentSkipListSetpollLastExample1 {                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                                         // Creating a set object                   
                                         ConcurrentSkipListSet<Integer> Lset =                               new                               ConcurrentSkipListSet<Integer>();                   
                             
                                         // Adding elements to this set                   
                                         for                               (                               int                               i =                               10                               ; i <=                               50                               ; i +=                               10                               )                   
                                         Lset.add(i);                   
                             
                                         // Printing the content of the set                   
                                         System.out.println(                               "Contents of the set: "                               + Lset);                   
                             
                                         // Retrieving and removing Last element of the set                   
                                         System.out.println(                               "The Last element of the set: "                               + Lset.pollLast());                   
                             
                                         // Printing the content of the set after pollLast()                   
                                         System.out.println(                               "Contents of the set after pollLast: "                               + Lset);                   
                                         }                   
                     }                   

输出：

Contents of the set: [10, 20, 30, 40, 50]
The Last element of the set: 50
Contents of the set after pollLast: [10, 20, 30, 40]

项目2：

                     // Java program to demonstrate pollLast()                   
                     // method of ConcurrentSkipListSet                   
                             
                     import                               java.util.concurrent.*;                   
                             
                     class                               ConcurrentSkipListSetpollLastExample2 {                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                                         // Creating a set object                   
                                         ConcurrentSkipListSet<Integer> Lset =                               new                               ConcurrentSkipListSet<Integer>();                   
                             
                                         // Printing the content of the set                   
                                         System.out.println(                               "Contents of the set: "                               + Lset);                   
                             
                                         // Retrieving and removing Last element of the set                   
                                         System.out.println(                               "The Last element of the set: "                               + Lset.pollLast());                   
                                         }                   
                     }                   

输出：

Contents of the set: []
The Last element of the set: null

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

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