SortedSet subSet() method in Java - GeeksforGeeks

30 Sep, 2018
The subSet() method of SortedSet interface in Java is used to return a view of the portion of this set whose elements range from fromElement, inclusive, to toElement, exclusive.
The set returned by this method is backed by this set, so changes in the returned set are reflected in this set, and vice-versa.
The set returned by this method supports all optional set operations that this set supports.
Note: The set returned by this method will throw an IllegalArgumentException if an attempt is made to insert an element outside its range.
Syntax:
SortedSet subSet(E fromElement,
                    E toElement)

Where, E is the type of element maintained by this Set.
Parameters: This function accepts two parameters fromElement and toElement which represent the low endpoint (inclusive) and high endpoint (exclusive) of the returned set.
Return Value: It returns the elements which in range between fromElement and toElement passed as argument.
Exceptions:
ClassCastException : It throws a ClassCastException if fromElement is not compatible with this set’s comparator (or, if the set has no comparator, if fromElement does not implement Comparable).
NullPointerException : It throws a NullPointerException if the parameter fromElement is null.
IllegalArgumentException : It throws an IllegalArgumentException this set itself has a restricted range, and the parameter fromElement lies outside the bounds of the range.
Below programs illustrate the above method:
Program 1:
// A Java program to demonstrate// working of SortedSetimport java.util.SortedSet;import java.util.TreeSet;  public class Main {    public static void main(String[] args)    {        // Create a TreeSet and inserting elements        SortedSet<Integer> s = new TreeSet<>();          // Adding Element to SortedSet        s.add(1);        s.add(5);        s.add(2);        s.add(3);        s.add(9);          // Returning the set with elements        // ranging between the passed value        System.out.print("Elements range between 2 and 9 in set are : "                         + s.subSet(2, 9));    }}
Elements range between 2 and 9 in set are : [2, 3, 5]

Program 2:
// A Java program to demonstrate// working of SortedSetimport java.util.SortedSet;import java.util.TreeSet;  public class Main {    public static void main(String[] args)    {        // Create a TreeSet and inserting elements        SortedSet<String> s = new TreeSet<>();          // Adding Element to SortedSet        s.add("Geeks");        s.add("For");        s.add("Geeks");        s.add("Code");        s.add("It");          // Returning the set with elements        // ranging between the passed value        System.out.print("Elements between C and G in set is : "                         + s.subSet("C", "G"));    }}
Elements between C and G in set is : [Code, For]

Reference: https://docs.oracle.com/javase/10/docs/api/java/util/SortedSet.html#subSet(E)
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