subSet(E fromElement, E toElement)
或 
subSet(E fromElement, boolean fromInclusive, E toElement, boolean toInclusive)

// Java program to demonstrate ConcurrentSkipListSet subSet() method
 
import java.util.concurrent.ConcurrentSkipListSet;
 
class ConcurrentSkipListSetExample {
    public static void main(String[] args)
    {
 
        // Initializing the set using ConcurrentSkipListSet()
        ConcurrentSkipListSet<Integer>
            set = new ConcurrentSkipListSet<Integer>();
 
        // Adding elements to this set
        set.add(65552);
        set.add(34324);
        set.add(93423);
        set.add(41523);
        set.add(90000);
 
        // Printing the ConcurrentSkipListSet
        System.out.println("ConcurrentSkipListSet: "
                           + set);
 
        // Printing the elements of ConcurrentSkipListSet that
        // are returned by subSet() method
        System.out.println("The returned elements are: "
                           + set.subSet(30000, 90000));
    }
}

ConcurrentSkipListSet: [34324, 41523, 65552, 90000, 93423]
The returned elements are: [34324, 41523, 65552]

// Java program to demonstrate ConcurrentSkipListSet subSet() method
 
import java.util.concurrent.ConcurrentSkipListSet;
 
class ConcurrentSkipListSetExample {
    public static void main(String[] args)
    {
 
        // Initializing the set using ConcurrentSkipListSet()
        ConcurrentSkipListSet<Integer>
            set = new ConcurrentSkipListSet<Integer>();
 
        // Adding elements to this set
        set.add(652);
        set.add(324);
        set.add(400);
        set.add(123);
        set.add(200);
 
        // Printing the ConcurrentSkipListSet
        System.out.println("ConcurrentSkipListSet: "
                           + set);
 
        // Printing the elements of ConcurrentSkipListSet that
        // are returned by subSet() method
        System.out.println("The returned elements are: "
                           + set.subSet(100, true, 400, true));
    }
}

ConcurrentSkipListSet: [123, 200, 324, 400, 652]
The returned elements are: [123, 200, 324, 400]