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How to save the elements of a TreeSet to a file in Java?
A TreeSet is a subclass of AbstractSet class and it does not allow duplicate elements. By default, TreeSet stores the elements in an ascending order and retrieval speed of an element out of a TreeSet is faster. The TreeSet class internally uses a TreeMap to store elements. The elements in a TreeSet are sorted according to their natural ordering.
We can also save the elements stored in a TreeSet to a file by using the Arrays.asList() method and pass this set as an argument to the writeObject() method of ObjectOutputStream class.
Syntax
public class TreeSet extends AbstractSet<E> implements NavigableSet<E>, Cloneable, Serializable
Example
import java.util.*;
import java.io.*;
public class TreeSetTest {
public static void main(String args[]) {
try {
String elements[] = {"Raja", "Jai", "Adithya", "Chaitanya"};
Set<String> set = new TreeSet<String>(Arrays.asList(elements));
FileOutputStream fos = new FileOutputStream("set.txt");
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(set);
oos.close();
System.out.println("The elements of a Set saved to a File Sucessfully");
} catch(Exception e) {
System.out.println("Error Occurred : " + e.getMessage());
}
}
}
Output
The elements of a Set saved to a File Sucessfully
Updated on: 01-Dec-2023
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