Java 中的 ConcurrentSkipListSet 下行 Set()方法
原文:https://www . geeksforgeeks . org/concurrentskiplistset-descendingset-method-in-Java/
java . util . concurrentskiplistset的dependingset()方法是 Java 中的一个内置函数，它返回这个集合中包含的元素的逆序视图。该集合支持降序集合，因此对该集合的更改会反映在降序集合中，反之亦然。
语法:
ConcurrentSkipListSet.descendingSet()
返回值:该函数返回一个导航集，它是这个集合的逆序视图。
下面的程序说明了 ConcurrentSkipListSet。Set()方法:
程序 1:
// Java Program Demonstrate descendingSet()
// method of ConcurrentSkipListSet */
import java.util.NavigableSet;
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(35);
set.add(20);
set.add(25);
// Printing the elements of the set
System.out.println("Contents of the set: " + set);
// Creating a descending set object
NavigableSet<Integer> des_set = set.descendingSet();
// Printing the elements of the descending set
System.out.println("Contents of the descending set: "
+ des_set);
}
}
输出:
Contents of the set: [10, 20, 25, 35]
Contents of the descending set: [35, 25, 20, 10]
程序 2: 演示在下降集合中插入元素时原始集合发生变化的程序。
// Java Program Demonstrate descendingSet()
// method of ConcurrentSkipListSet */
import java.util.NavigableSet;
import java.util.Iterator;
import java.util.concurrent.ConcurrentSkipListSet;
class ConcurrentSkipListSetIteratorExample2 {
public static void main(String[] args)
{
// Initializing the set
ConcurrentSkipListSet<String>
set = new ConcurrentSkipListSet<String>();
// Adding elements to this set
set.add("bob");
set.add("alex");
set.add("eric");
set.add("chuck");
// Creating a descending object
NavigableSet<String> des_set = set.descendingSet();
// Adding elements to the descending set and also to the set
des_set.add("drake");
des_set.add("fred");
// Printing the elements of the set
System.out.println("Contents of the set: " + set);
// Printing the elements of the descending set
System.out.println("Contents of the descending set: "
+ des_set);
}
}
输出:
Contents of the set: [alex, bob, chuck, drake, eric, fred]
Contents of the descending set: [fred, eric, drake, chuck, bob, alex]
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