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

这个 JAVAutil。同时发生的ConcurrentSkipListSet。清除（） 方法是Java中的一个内置函数，它从这个集合中删除所有元素。

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语法：

 ConcurrentSkipListSet.clear()

参数： 该函数不接受任何参数。

返回值： 该函数不返回任何内容。

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

项目1：

                     /* Java Program Demonstrate clear()                   
                     method of ConcurrentSkipListSet() */                   
                     import                               java.util.concurrent.*;                   
                     class                               ConcurrentSkipListSetClearExample1 {                   
                                         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 elements of the set                   
                                         System.out.println(                               "The set contains: "                               + Lset);                   
                             
                                         // Clear the set                   
                                         Lset.clear();                   
                             
                                         // Printing elements of the set after clear operation                   
                                         System.out.println(                               "After clear operation the set contains: "                   
                                         + Lset);                   
                                         }                   
                     }                   

输出：

The set contains: [10, 20, 30, 40, 50]
After clear operation the set contains: []

项目2：

                     /* Java Program Demonstrate clear()                   
                     method of ConcurrentSkipListSet() */                   
                     import                               java.util.concurrent.*;                   
                     class                               ConcurrentSkipListSetClearExample2 {                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                                         // Creating a set object                   
                                         ConcurrentSkipListSet<String> Lset =                   
                                         new                               ConcurrentSkipListSet<String>();                   
                             
                                         // Adding elements to this set                   
                                         Lset.add(                               "alex"                               );                   
                                         Lset.add(                               "bob"                               );                   
                                         Lset.add(                               "chuck"                               );                   
                                         Lset.add(                               "drake"                               );                   
                                         Lset.add(                               "eric"                               );                   
                             
                                         // Printing elements of the set                   
                                         System.out.println(                               "The set contains: "                               + Lset);                   
                             
                                         // Clear the set                   
                                         Lset.clear();                   
                             
                                         // Printing elements of the set after clear operation                   
                                         System.out.println(                               "After clear operation the set contains: "                   
                                         + Lset);                   
                                         }                   
                     }                   

输出：

The set contains: [alex, bob, chuck, drake, eric]
After clear operation the set contains: []

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

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