java.util.concurrent.ConcurrentSkipListSet.ceiling()方法是Java中的内置函数,该函数返回该集合中大于或等于给定元素的最小元素;如果没有此类元素,则返回null。
用法:
ConcurrentSkipListSet.ceiling(E e)
参数:该函数接受单个参数,即要匹配的元素。
返回值:该函数返回大于或等于e的最小元素;如果没有这样的元素,则返回null。
异常:该函数显示以下异常:
- ClassCastException-如果无法将指定的元素与集合中当前的元素进行比较
- NullPointerException-如果指定的元素为null
以下示例程序旨在说明ConcurrentSkipListSet.ceiling()方法:
示例1:查找数字的上限。
// Java Program Demonstrate ceiling()
// method of ConcurrentSkipListSet
import java.util.concurrent.*;
class ConcurrentSkipListSetCeilingExample1 {
public static void main(String[] args)
{
// Creating a set object
ConcurrentSkipListSet<Integer> Lset =
new ConcurrentSkipListSet<Integer>();
// Adding elements to this set
Lset.add(45);
Lset.add(72);
Lset.add(31);
Lset.add(13);
Lset.add(89);
// Printing elements of the set
System.out.println("The set contains: ");
for (Integer i : Lset)
System.out.print(i + " ");
// Ceiling of 35
System.out.println("\nCeiling of 35: " + Lset.ceiling(35));
// Ceiling of 100
System.out.println("\nCeiling of 100: " + Lset.ceiling(100));
}
}
输出:
The set contains: 13 31 45 72 89 Ceiling of 35: 45 Ceiling of 100: null
示例2:在ceiling()中显示NullPointerException。
// Java Program Demonstrate ceiling()
// method of ConcurrentSkipListSet
import java.util.concurrent.*;
import java.io.*;
class ConcurrentSkipListSetCeilingExample2 {
public static void main(String[] args) throws IOException
{
// Creating a set object
ConcurrentSkipListSet<Integer> Lset =
new ConcurrentSkipListSet<Integer>();
// Adding elements to this set
Lset.add(45);
Lset.add(72);
Lset.add(31);
Lset.add(13);
Lset.add(89);
try {
// Ceiling of null
System.out.println("Ceiling of null: " + Lset.ceiling(null));
}
catch (Exception e) {
System.out.println("Exception : " + e);
}
}
}
输出:
Exception : java.lang.NullPointerException
参考: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#ceiling(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 ceiling() 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。