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Program: Basic TreeSet Operations.


Below example shows basic operations on TreeSet like creating object, adding elements to it, verifies elements existance, deleting all elements at once, size of the set and deleting a specific element.

package com.java2novice.treeset;

import java.util.TreeSet;

public class MyBasicTreeset {

        public static void main(String a[]){
                TreeSet<String> ts = new TreeSet<String>();
                System.out.println("Elements: "+ts);
                //check is set empty?
                System.out.println("Is set empty: "+ts.isEmpty());
                //delete all elements from set
                System.out.println("Is set empty: "+ts.isEmpty());
                System.out.println("Size of the set: "+ts.size());
                //remove one string
                System.out.println("Elements: "+ts);

Elements: [one, three, two]
Is set empty: false
Is set empty: true
Size of the set: 3
Elements: [one, three]
Next Program >>

List Of All TreeSet Sample Programs:

  1. Basic TreeSet Operations.
  2. How to create a TreeSet with a List?
  3. How to read objects from TreeSet using using Iterator?
  4. Write a program to remove duplicate entries from an array.
  5. Write a program to find duplicate value from an array.
  6. How to create a TreeSet with comparator?
  7. Create TreeSet with comparator by user define objects.
  8. How to sort a TreeSet with user defined objects?
  9. How to get subset from sorted set?
  10. How to get least value element from a set?
  11. How to get highest value element from a set?
  12. How to avoid duplicate user defined objects in TreeSet?
Knowledge Centre
Transient and Volatile Modifiers
Transient: The transient modifier applies to variables only and it is not stored as part of its object's Persistent state. Transient variables are not serialized.

Volatile: Volatile modifier applies to variables only and it tells the compiler that the variable modified by volatile can be changed unexpectedly by other parts of the program.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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