Question

Hey can anyone help me understand how to do an edit method for my company application. I had previously asked for help with a search method. And i think the edit method might involve the search method.

Here is my code:

EmployeeStore.

//Imports.
import java.util.HashMap;
//********************************************************************
public class EmployeeStore
{
    HashMap<String, Employee> map;

//Constructor.  
    public EmployeeStore()
    {
        map = new HashMap<String,Employee>();
    }
//********************************************************************
//Hashmap Methods.
//Add to the Hashmap : Employee.
    public void add(Employee employee)
    {

        map.put(employee.getEmployeeName(), employee);
    }
//********************************************************************
//Remove from the Hashmap : Employee.
    public void remove(String key)
    {
      //Remove the Employee by name.
        map.remove(key);
    }
//********************************************************************
//Clear the Hashmap : Employee.
    public void clear()
    {
        map.clear();
    }
    //********************************************************************
//Print the Hashmap : Employee. 
    public void print()
    {
        System.out.println("\n********Employee's in the Company.********");
        for (Employee employee : map.values())
        {
            //System.out.println(employee); to print the toString of Employee class
            //or:
            System.out.println("Employee Name:\t" + employee.getEmployeeName());
            System.out.println("Employee Id:\t" + employee.getEmployeeId());
            System.out.println("E-mail:\t"+ employee.getEmployeeEmail());
        }

    }
    public Employee get(String name){
        return map.get(name);
    }
    /*public void searchByName ()
    {
        //(for(Employee e : map.values()) {...}) 
        //and check for each employee if his/her email matches the searched value
        for(Employee e : map.values())
        {
            System.out.println(e);
            map.equals(getClass());

        }
    }*/
//********************************************************************
    public Employee searchByName(String name) 
    {
        Employee employee = map.get(name);    
        System.out.println(employee);
        return employee;
    }
//********************************************************************

    public Employee searchByEmail(String email) 
    {
        for (Employee employee : map.values())
        {
            if (email.equals(employee.getEmployeeEmail()))
            {
                System.out.println(employee);
                return employee;
            }
        }
        return null;
    }
//********************************************************************





//********************************************************************  
//********************************************************************


}

Employee class.

//Imports:

//********************************************************************
//Employee Class.
public class Employee
{
//Variables.
    private String employeeName;
    private int employeeId;
    private String employeeEmail;
//********************************************************************  
//Constructor.
    public Employee(String employeeName, int employeeId, String employeeEmail) 
    {
        this.employeeName = employeeName;
        this.employeeId = employeeId;
        this.employeeEmail = employeeEmail;
    }
//********************************************************************
//Getters.
    public String getEmployeeEmail() {
        return employeeEmail;
    }
    public void setEmployeeEmail(String employeeEmail) {
        this.employeeEmail = employeeEmail;
    }
    public String getEmployeeName() {
        return employeeName;
    }
    public int getEmployeeId() {
        return employeeId;
    }
//********************************************************************
//toString method.
    public String toString() {
        return "\t\t\tEmployee\n" +
                "********************************************************************\n"+
                "Employee Name: "+ employeeName +"\n"+ 
                "Employee Id: " + employeeId +"\n"+  
                "Employee Email: " + employeeEmail;
    }
//********************************************************************





}

Answer 1

You can use the put method of java’s HashMap for this as well. From the API for HashMap’s put method:

If the map previously contained a mapping for this key, the old value is replaced.

So, something like:

public void edit(Employee employee)
{
    map.put(employee.getEmployeeName(), employee);
}

And then in the other code:

Employee employee = getEmployeeByName("Someniceemployeename");
if (employee != null)
{
    employee.setEmployeeEmail("[e-mail]");
    edit(employee);
}

As for editing the ID of an employee, you need to take some additional precautions. First, you want to make sure that the map contains the ID you want to edit (as usual). Second, when “editing” the ID you need to first remove the old employee instance from the map (with the old ID) and then add the new employee with put.