Java ConcurrentSkipListSet size()用法及代碼示例

java.util.concurrent.ConcurrentSkipListSet.size()方法是Java中的內置函數，它提供集合中存在的元素的總數。

用法:

ConcurrentSkipListSet.size()

參數：該函數不接受任何參數。

返回值：該函數返回隊列中的元素數。

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

示例1:

// Java Program Demonstrate size() 
// method of ConcurrentSkipListSet 
  
import java.util.concurrent.ConcurrentSkipListSet; 
  
class ConcurrentSkipListSetSizeExample1 { 
    public static void main(String[] args) 
    { 
        // Initializing the set 
        ConcurrentSkipListSet<Integer> set =  
                       new ConcurrentSkipListSet<Integer>(); 
  
        // Adding elements to this set 
        for (int i = 1; i <= 10; i++) 
            set.add(i); 
  
        // Printing the size of the set 
        System.out.println("Number of elements in the set = "
                           + set.size()); 
        // Printing the elements 
        System.out.println("set : " + set); 
    } 
}

輸出：

Number of elements in the set = 10
set : [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

示例2:

// Java Program Demonstrate size() 
// method of ConcurrentSkipListSet 
  
import java.util.concurrent.ConcurrentSkipListSet; 
  
class ConcurrentSkipListSetSizeExample2 { 
    public static void main(String[] args) 
    { 
        // Initializing the set 
        ConcurrentSkipListSet<String> set =  
                         new ConcurrentSkipListSet<String>(); 
  
        // Adding elements to this set 
        set.add("A"); 
        set.add("B"); 
        set.add("C"); 
        set.add("D"); 
        set.add("E"); 
  
        // Printing the size of the set 
        System.out.println("Number of elements in the set = "
                           + set.size()); 
        // Printing the elements 
        System.out.println("set : " + set); 
    } 
}

輸出：

Number of elements in the set = 5
set : [A, B, C, D, E]

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

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