Java中的 ConcurrentSkipListSet descendingIterator() 方法

Java .util.concurrent.ConcurrentSkipListSet的descendingIterator()方法是Java中的一个内置函数，用于按降序返回此集合中元素的迭代器。

句法：

ConcurrentSkipListSet.descendingIterator()

返回值：该函数以降序返回此集合中元素的迭代器。

下面的程序说明了 ConcurrentSkipListSet.descendingIterator() 方法：

方案一：

// Java Program Demonstrate descendingIterator()
// method of ConcurrentSkipListSet 
  
import java.util.Iterator;
import java.util.concurrent.ConcurrentSkipListSet;
  
class ConcurrentSkipListSetIteratorExample1 {
    public static void main(String[] args)
    {
  
        // Initializing the set
        ConcurrentSkipListSet
            set = new ConcurrentSkipListSet();
  
        // Adding elements to this set
        set.add("Gfg");
        set.add("is");
        set.add("fun!!");
  
        // Returns an iterator over the elements
        Iterator iterator = set.descendingIterator();
  
        // Printing the elements of the set
        while (iterator.hasNext())
            System.out.print(iterator.next() + " ");
    }
}

输出：

is fun!! Gfg

方案二：

// Java Program Demonstrate descendingIterator()
// method of ConcurrentSkipListSet 
  
import java.util.Iterator;
import java.util.concurrent.ConcurrentSkipListSet;
  
class ConcurrentSkipListSetIteratorExample1 {
    public static void main(String[] args)
    {
  
        // Initializing the set
        ConcurrentSkipListSet
            set = new ConcurrentSkipListSet();
  
        // Adding elements to this set
        set.add(10);
        set.add(15);
        set.add(20);
        set.add(25);
  
        // Returns an iterator over the elements
        Iterator iterator = set.descendingIterator();
  
        // Printing the elements of the set
        while (iterator.hasNext())
            System.out.print(iterator.next() + " ");
    }
}

输出：

25 20 15 10

参考： https: Java/util/concurrent/ConcurrentSkipListSet.html#descendingIterator–