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Program: How to get least value element from a set?


Description:

To get least value element of user design objects, we need to implement sorting logic on TreeSet. 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 least value element from set by using first() method depending on your sorting logic.


Code:
package com.java2novice.treeset;

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

public class MyLeastElementInSet {

	public static void main(String a[]){
		
		TreeSet<Empl1> salComp = new TreeSet<Empl1>(new MySalCompr());
		salComp.add(new Empl1("Ram",3000));
		salComp.add(new Empl1("John",6000));
		salComp.add(new Empl1("Crish",2000));
		salComp.add(new Empl1("Tom",2400));
		System.out.println("Least salary emp: "+salComp.first());
	}
}

class MySalCompr implements Comparator<Empl1>{

	@Override
	public int compare(Empl1 e1, Empl1 e2) {
		if(e1.getSalary() > e2.getSalary()){
			return 1;
		} else {
			return -1;
		}
	}
}

class Empl1{
	
	private String name;
	private int salary;
	
	public Empl1(String n, int s){
		this.name = n;
		this.salary = s;
	}
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getSalary() {
		return salary;
	}
	public void setSalary(int salary) {
		this.salary = salary;
	}
	public String toString(){
		return "Name: "+this.name+"-- Salary: "+this.salary;
	}
}

Output:
Least salary emp: Name: Crish-- Salary: 2000
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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
Inner class and Anonymous class
Inner class: classes defined in other classes, including those defined in methods are called inner classes. An inner class can have any accessibility including private.

Anonymous class: Anonymous class is a class defined inside a method without a name and is instantiated and declared in the same place and cannot have explicit constructors.
Famous Quotations
Do not confuse motion and progress. A rocking horse keeps moving but does not make any progress.
-- Alfred A. Montapert

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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