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Program: How to get subset from sorted set?


Description:

To implement your own sorting functionality with TreeSet on user defined objects, you have to pass Comparator object along with TreeSet constructor call. The Comparator implementation holds the sorting logic. You have to override compare() method to provide the sorting logic on user defined objects. Now you can get range of object from the treeset by calling subSet() method.


Code:
package com.java2novice.treeset;

import java.util.Comparator;
import java.util.Set;
import java.util.TreeSet;

public class MySetSublist {

	public static void main(String a[]){
		
		TreeSet<String> ts = new TreeSet<String>(new MyStrComp());
		ts.add("RED");
		ts.add("ORANGE");
		ts.add("BLUE");
		ts.add("GREEN");
		ts.add("WHITE");
		ts.add("BROWN");
		ts.add("YELLOW");
		ts.add("BLACK");
		System.out.println(ts);
		Set<String> subSet = ts.subSet("GREEN", "WHITE");
		System.out.println("sub set: "+subSet);
		subSet = ts.subSet("GREEN", true, "WHITE", true);
		System.out.println("sub set: "+subSet);
		subSet = ts.subSet("GREEN", false, "WHITE", true);
		System.out.println("sub set: "+subSet);
	}
}

class MyStrComp implements Comparator<String>{

	@Override
	public int compare(String str1, String str2) {
		return str1.compareTo(str2);
	}
	
}

Output:
[BLACK, BLUE, BROWN, GREEN, ORANGE, RED, WHITE, YELLOW]
sub set: [GREEN, ORANGE, RED]
sub set: [GREEN, ORANGE, RED, WHITE]
sub set: [ORANGE, RED, WHITE]
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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?
Knowledge Centre
Domain Naming Service(DNS)
It is very difficult to remember a set of numbers (IP address) to connect to the Internet. The Domain Naming Service(DNS) is used to overcome this problem. It maps one particular IP address to a string of characters. For example, www.java2novice.com implies com is the domain name reserved for US commercial sites, java2novice is the name of the company and www is the name of the specific computer, which is java2novice's server.
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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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