Java 中的 ConcurrentSkipListSet pollLast()方法
原文:https://www . geeksforgeeks . org/concurrentskiplistset-poll last-method-in-Java/
java . util . concurrentskiplistset的 pollLast() 方法是 Java 中的一个内置函数，它返回检索并删除最后一个(最高的)元素，如果这个集合为空，则返回 null。
语法:
public E pollLast()
返回值:函数返回检索并删除最后一个(最高的)元素，如果该集合为空，则返回 null。
下面的程序说明了 ConcurrentSkipListSet.pollLast()方法:
程序 1:
// Java program to demonstrate pollLast()
// method of ConcurrentSkipListSet
import java.util.concurrent.*;
class ConcurrentSkipListSetpollLastExample1 {
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);
// Printing the content of the set
System.out.println("Contents of the set: " + Lset);
// Retrieving and removing Last element of the set
System.out.println("The Last element of the set: " + Lset.pollLast());
// Printing the content of the set after pollLast()
System.out.println("Contents of the set after pollLast: " + Lset);
}
}
Output:
Contents of the set: [10, 20, 30, 40, 50]
The Last element of the set: 50
Contents of the set after pollLast: [10, 20, 30, 40]
程序 2:
// Java program to demonstrate pollLast()
// method of ConcurrentSkipListSet
import java.util.concurrent.*;
class ConcurrentSkipListSetpollLastExample2 {
public static void main(String[] args)
{
// Creating a set object
ConcurrentSkipListSet<Integer> Lset = new ConcurrentSkipListSet<Integer>();
// Printing the content of the set
System.out.println("Contents of the set: " + Lset);
// Retrieving and removing Last element of the set
System.out.println("The Last element of the set: " + Lset.pollLast());
}
}
Output:
Contents of the set: []
The Last element of the set: null
参考: https://docs . Oracle . com/javase/8/docs/API/Java/util/concurrentskiplistset . html # pollast–
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