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Program: How to get max element of a list of user defined objects using Comparator?


Collections.min() method returns the minimum element of the given collection, according to the order induced by the specified comparator. All elements in the collection must be mutually comparable by the specified comparator (that is,, e2) must not throw a ClassCastException for any elements e1 and e2 in the collection). Below example shows how to get min salary from the given list of user defined objects by using comparator object.

package com.java2novice.collections;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class MyMinComparator {

        public static void main(String a[]){
                List<Empy> emps = new ArrayList<Empy>();
                emps.add(new Empy(10, "Raghu", 25000));
                emps.add(new Empy(120, "Krish", 45000));
                emps.add(new Empy(210, "John", 14000));
                emps.add(new Empy(150, "Kishore", 24000));
                Empy minSal = Collections.min(emps, new EmpyComp());
                System.out.println("Employee with min salary: "+minSal);

class EmpyComp implements Comparator<Empy>{

        public int compare(Empy e1, Empy e2) {
                return e1.getSalary().compareTo(e2.getSalary());

class Empy{
        private int id;
        private String name;
        private Integer salary;
        public Empy(int id, String name, Integer sal){
       = id;
       = name;
                this.salary = sal;
        public int getId() {
                return id;
        public void setId(int id) {
       = id;
        public String getName() {
                return name;
        public void setName(String name) {
       = name;
        public Integer getSalary() {
                return salary;
        public void setSalary(Integer salary) {
                this.salary = salary;
        public String toString(){
                return id+"  "+name+"   "+salary;

Employee with min salary: 210  John   14000
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  20. How to get max element of a list of user defined objects?
  21. How to get min element of a list of user defined objects?
  22. How to get max element of a list of user defined objects using Comparator?
  23. How to get min element of a list of user defined objects using Comparator?
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Knowledge Centre
Can we override static method?
We cannot override static methods. Static methods are belogs to class, not belongs to object. Inheritance will not be applicable for class members
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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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