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


Description:

To get highest 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 highest value element from set by using last() method depending on your sorting logic.


Code:
package com.java2novice.treeset;

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

public class MyHighSalEmp {
	public static void main(String a[]){
		
		TreeSet<Empl2> salComp = new TreeSet<Empl2>(new MySalCompr1());
		salComp.add(new Empl2("Ram",3000));
		salComp.add(new Empl2("John",6000));
		salComp.add(new Empl2("Crish",2000));
		salComp.add(new Empl2("Tom",2400));
		System.out.println("Highest salary emp: "+salComp.last());
	}
}

class MySalCompr1 implements Comparator<Empl2>{

	@Override
	public int compare(Empl2 e1, Empl2 e2) {
		if(e1.getSalary() > e2.getSalary()){
			return 1;
		} else {
			return -1;
		}
	}
}

class Empl2{
	
	private String name;
	private int salary;
	
	public Empl2(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:
Highest salary emp: Name: John-- Salary: 6000
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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
Default value of a local variables?
The local variables are not initialized to any default values. We should not use local variables with out initialization. Even the java compiler throws error.
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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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