Implements equals Method - Java Object Oriented Design

Java examples for Object Oriented Design:equals method

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Description

Implements equals Method

Demo Code

public class TestEquality2
{
    public static void main(String[] args)
    {//from ww w.j  a  v  a  2s. c om
    Employee emp1 = new Employee("M", "A");
    Employee emp2 = new Employee("M", "A");
    if (emp1.equals(emp2))
        System.out.println("These employees are the same.");
    else
        System.out.println("These are two different employees.");
    }
}

class Employee
{
  private String lastName;
  private String firstName;

  public Employee(String lastName, String firstName)
  {
    this.lastName = lastName;
    this.firstName = firstName;
  }

  public String getLastName()
  {
    return this.lastName;
  }

  public String getFirstName()
  {
    return this.firstName;
  }

  public boolean equals(Object obj)
  {
    // an object must equal itself
    if (this == obj)
        return true;

    // no object equals null
      if (this == null)
        return false;

    // objects of different types are never equal
    if (this.getClass() != obj.getClass())
        return false;

    // cast to an Employee, then compare the fields
    Employee emp = (Employee) obj;
    return this.lastName.equals(emp.getLastName())
           && this.firstName.equals(emp.getFirstName());
  }

}

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