Java ConcurrentSkipListSet clear()用法及代碼示例

java.util.concurrent.ConcurrentSkipListSet.clear()方法是Java中的內置函數，該函數從該集合中刪除所有元素。

用法:

 ConcurrentSkipListSet.clear()

參數：該函數不接受任何參數。

返回值：該函數不返回任何內容。

以下示例程序旨在說明ConcurrentSkipListSet.clear()方法：

示例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); 
    } 
}

輸出：

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

示例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); 
    } 
}

輸出：

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

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

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注：本文由純淨天空篩選整理自rupesh_rao大神的英文原創作品 ConcurrentSkipListSet clear() method in Java。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。