Java- Find the element in the List having maximum value

By Atul Rai | Last Updated: May 30, 2021 Previous       Next

In Java 8, Stream API’s max method returns the maximum element of this stream according to the provided Comparator and the filter method returns the elements of this stream that match the given predicate(condition).

Test Case: We have a list of employees and our task is to find the employee details having a maximum salary.

1. Find the maximum salary.

int maxSalary = employees.stream()
						 .map(Employee::getSalary)
						 .max(Integer::compare).get();

2. Filter the employee on the basis of maximum salary.

Stream<Employee> employee = employees.stream()
		                             .filter(emp -> emp.getSalary() == maxSalary);

See the complete example.

package org.websparrow;

public class Employee {

	// Generate Getters and Setters...
	private long id;
	private String name;
	private int salary;
	private String department;

	public Employee(long id, String name, int salary, String department) {
		this.id = id;
		this.name = name;
		this.salary = salary;
		this.department = department;
	}

	@Override
	public String toString() {
		return "Employee [id=" + id + ","
				+ " name=" + name + ","
				+ " salary=" + salary + ","
				+ " department=" + department + "]";
	}
}

package org.websparrow;

import java.util.Arrays;
import java.util.List;

public class FindEmployee {

	public static void main(String[] args) {

		List<Employee> employees = Arrays.asList(
				new Employee(101, "Manish", 5000, "IT"),
				new Employee(109, "Atul", 3000, "HR"),
				new Employee(111, "Santosh", 4400, "IT"),
				new Employee(109, "Rupendra", 3200, "FIN")
				);

		// return max salary
		int maxSalary = employees.stream()
								 .map(Employee::getSalary)
								 .max(Integer::compare).get();

		System.out.println("Max salary of the employee:" + maxSalary);
		System.out.print("Employee details:");
		
		//filter the employee having max salary
		employees.stream()
				 .filter(emp -> emp.getSalary() == maxSalary)
				 .forEach(System.out::println);		 

	}

}

Output:

Max salary of the employee:5000
Employee details:Employee [id=101, name=Manish, salary=5000, department=IT]

References

1. How to sort list in Java 8
2. Java- Find all Capital Letters in the String