Java ConcurrentSkipListSet descendingIterator()方法
java.util.concurrent.ConcurrentSkipListSet 的 descendingIterator() 方法是Java中的一个内置函数,用于返回该集合中元素的递减迭代器。
语法
ConcurrentSkipListSet.descendingIterator()
返回值: 该函数按降序返回该集合中的元素的迭代器。
下面的程序说明了ConcurrentSkipListSet.descendingIterator()方法。
程序1 :
// 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<String>
set = new ConcurrentSkipListSet<String>();
// Adding elements to this set
set.add("Gfg");
set.add("is");
set.add("fun!!");
// Returns an iterator over the elements
Iterator<String> iterator = set.descendingIterator();
// Printing the elements of the set
while (iterator.hasNext())
System.out.print(iterator.next() + " ");
}
}
输出。
is fun!! Gfg
程序2
// 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<Integer>
set = new ConcurrentSkipListSet<Integer>();
// Adding elements to this set
set.add(10);
set.add(15);
set.add(20);
set.add(25);
// Returns an iterator over the elements
Iterator<Integer> iterator = set.descendingIterator();
// Printing the elements of the set
while (iterator.hasNext())
System.out.print(iterator.next() + " ");
}
}
输出。
25 20 15 10
参考资料: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#descendingIterator-