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Java ConcurrentSkipListSet isEmpty()用法及代码示例


java.util.concurrent.ConcurrentSkipListSet.isEmpty()方法是Java中的内置函数,用于检查此集合是否为空。

用法:

ConcurrentSkipListSet.isEmpty()

参数:该函数不接受任何参数。


返回值:该函数返回一个布尔值。如果ConcurrentSkipListSet为空,则返回true,否则返回false。

以下示例程序旨在说明ConcurrentSkipListSet.IsEmpty()方法:

示例1:在此程序中,ConcurrentSkipListSet为非空。

// 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."); 
    } 
}
输出:
The set is non-empty.

示例2:在此程序中,ConcurrentSkipListSet为空。

// 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."); 
    } 
}
输出:
The set is empty.

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



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注:本文由纯净天空筛选整理自rupesh_rao大神的英文原创作品 ConcurrentSkipListSet isEmpty() method in Java。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。