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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
What is fail-fast in java?
A fail-fast system is nothing but immediately report any failure that is likely to lead to failure. When a problem occurs, a fail-fast system fails immediately. In Java, we can find this behavior with iterators. Incase, you have called iterator on a collection object, and another thread tries to modify the collection object, then concurrent modification exception will be thrown. This is called fail-fast.
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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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