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Program: How to create a TreeSet with a List?


Below example shows how to create TreeSet with other collection. By passing another collection to the TreeSet constructor, you can copy entire collections elements to the TreeSet.

package com.java2novice.treeset;

import java.util.ArrayList;
import java.util.List;
import java.util.TreeSet;

public class MySetWithCollection {
        public static void main(String a[]){
                List<String> li = new ArrayList<String>();
                System.out.println("List: "+li);
                //create a treeset with the list
                TreeSet<String> myset = new TreeSet<String>(li);
                System.out.println("Set: "+myset);

List: [one, two, three, four]
Set: [four, one, three, two]
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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?
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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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