HashMap Code. i) Find an employee whose id is 300. ii) Display all the employee information to show that map does not preserve insertion order. iii) Override toString method

Employee.java

import java.util.Map;
import java.util.HashMap;

public class Employee{
	Integer empId;
	String name;

	@Override
	public String toString()
	{
		return "Employee Id: " + empId + " Employee name: " + name;
	}


	public static void main(String[] args)
	{
		Map<Integer,Employee> empMap = new HashMap<Integer, Employee>();
		Employee emp1 = new Employee();
		emp1.name = "Moore";
		emp1.empId = 300;

		Employee emp2 = new Employee();

		emp2.name = "Thawn";
		emp2.empId = 500;


		Employee emp3 = new Employee();
		emp3.name = "Core";
		emp3.empId = 100;


		empMap.put(emp1.empId, emp1);
		empMap.put(emp2.empId, emp2);
		empMap.put(emp3.empId, emp3);

		System.out.println(empMap.get(300));

		//Iterate over each element in map
		for (Map.Entry<Integer, Employee> entry : empMap.entrySet())
		{
		    System.out.println(entry.getKey() + "/" + entry.getValue());
		}
	}
}