Java ConcurrentSkipListSet isEmpty()用法及代碼示例

java.util.concurrent.ConcurrentSkipListSet.isEmpty()方法是Java中的內置函數，用於檢查此集合是否為空。

用法:

ConcurrentSkipListSet.isEmpty()

參數：該函數不接受任何參數。

返回值：該函數返回一個布爾值。如果ConcurrentSkipListSet為空，則返回true，否則返回false。

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

示例1:在此程序中，ConcurrentSkipListSet為非空。

// Java Program to demonstrate isEmpty() 
// method of ConcurrentSkipListSet()  
  
import java.util.concurrent.*; 
  
class ConcurrentSkipListSetIsEmptyExample1 { 
    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); 
  
        // Checks if this set is empty or not 
        if (Lset.isEmpty()) 
            System.out.println("The set is empty."); 
        else
            System.out.println("The set is non-empty."); 
    } 
}

輸出：

The set is non-empty.

示例2:在此程序中，ConcurrentSkipListSet為空。

// Java program to demonstrate isEmpty() 
// method of ConcurrentSkipListSet()  
  
import java.util.concurrent.*; 
  
class ConcurrentSkipListSetIsEmptyExample2 { 
    public static void main(String[] args) 
    { 
        // Creating a set object 
        ConcurrentSkipListSet<Integer> Lset =  
                       new ConcurrentSkipListSet<Integer>(); 
  
        // Checks if this set is empty or not 
        if (Lset.isEmpty()) 
            System.out.println("The set is empty."); 
        else
            System.out.println("The set is non-empty."); 
    } 
}

輸出：

The set is empty.

參考： https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#add(E)

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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 isEmpty() 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。