网捷达

The higher(E e) method of java.util.concurrent.ConcurrentSkipListSet is an in-built function in Java which returns the least element in this set strictly greater than the given element, or null if there is no such element. Syntax:

public E higher(E e)

Parameter: The function accepts a single parameter e i.e the value to match Return Value: The function returns the least element greater than e, or null if there is no such element. Exception: The function throws the following exceptions:

ClassCastException - if the specified element cannot be compared with the elements currently in the set.

NullPointerException - if the specified element is null

Below programs illustrate the ConcurrentSkipListSet.higher(E e) method: Program 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<Integer>
            Lset = new ConcurrentSkipListSet<Integer>();

        // 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:

The higher of 20 in the set: 30
The higher of 39 in the set: 40
The higher of 50 in the set: null

Program 2: Program to show NullPointerException in higher().

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<Integer>
            Lset = new ConcurrentSkipListSet<Integer>();

        // 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:

Exception: java.lang.NullPointerException

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#higher-E-

ConcurrentSkipListSet higher() method in Java

Explore