Java 中的 ConcurrentSkipListSet higher()方法
原文:https://www . geeksforgeeks . org/concurrentskiplistset-higher-in-method-Java/
java . util . concurrentskiplistset的 higher(E e) 方法是 Java 中的一个内置函数，它返回这个集合中严格大于给定元素的最少元素，如果没有这样的元素，则返回 null。
语法:
public E higher(E e)
参数:该函数接受单个参数 e ，即要匹配的值
返回值:函数返回大于 e 的最小元素，如果没有这样的元素，则返回 null。
异常:函数抛出以下异常:
-
class castexception–如果指定元素无法与集合中的当前元素进行比较。 NullPointerException* – if the specified element is null
下面的程序说明了 concurrentskiplistset . higher(E E)方法:
程序 1:
```java // Java program to demonstrate higher() // method of ConcurrentSkipListSet
import java.util.concurrent.*;
class ConcurrentSkipListSetHigherExample1 { public static void main(String[] args) { // Creating a set object ConcurrentSkipListSet Lset = new ConcurrentSkipListSet();
// Adding elements to this set for (int i = 10; i <= 50; i += 10) Lset.add(i);
// Finding higher of 20 in the set System.out.println("The higher of 20 in the set: " + Lset.higher(20));
// Finding higher of 39 in the set System.out.println("The higher of 39 in the set: " + Lset.higher(39));
// Finding higher of 50 in the set System.out.println("The higher of 50 in the set: " + Lset.higher(50)); } } ```
Output:
```java The higher of 20 in the set: 30 The higher of 39 in the set: 40 The higher of 50 in the set: null
```
程序 2: 以更高的()显示空指针异常的程序。
```java // Java program to demonstrate higher() // method of ConcurrentSkipListSet
import java.util.concurrent.*;
class ConcurrentSkipListSetHigherExample1 { public static void main(String[] args) { // Creating a set object ConcurrentSkipListSet Lset = new ConcurrentSkipListSet();
// Adding elements to this set for (int i = 10; i <= 50; i += 10) Lset.add(i);
try { // Trying to find higher of "null" in the set System.out.println("The higher of null in the set: " + Lset.higher(null)); } catch (Exception e) { System.out.println("Exception: " + e); } } } ```
Output:
```java Exception: java.lang.NullPointerException
```
参考: https://docs . Oracle . com/javase/8/docs/API/Java/util/concurrentskiplistset . html # higher-E-
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