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Thread: Needs help with code

  1. #1
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    Default Needs help with code

    I was wondering how do I go about adding this to my code?

    Now, create public accessor & private modifier methods (gets & sets) in the “Employee.java” file for each of the 4 data
    members. Use the following as the error-checking criteria in your modifier (“set”) methods:
    - First Name & Last Name: Must have size greater than zero, and size less than or equal to 20.
    - Employee Id: Value must be greater than or equal to 1000, but less than or equal to 9999.
    - Employee Rate: Must be greater than zero.

    public class Employee {

    public String firstName;
    public String lastName;
    private double hourlyRate;
    private int employeeId;


    private Employee(String first, String last, double hourly, int employeeID)
    {
    firstName = first;
    lastName = last;
    hourlyRate = hourly;
    employeeId = employeeID;
    }


    public static void main(String[] args)
    {

    Employee e = new Employee("John", "Doe", 14.79, 1597);

    System.out.println("Name: " + e.firstName + " " + e.lastName);
    System.out.println("Hourly: $" + e.hourlyRate);
    System.out.println("EmployeeID: " + e.employeeId);
    System.out.println(); // This will simply create a blank line

    e = new Employee("Sarah", " Dao", 17.55, 2574);

    System.out.println("Name: " + e.firstName + " " + e.lastName);
    System.out.println("Hourly: $" + e.hourlyRate);
    System.out.println("EmployeeID: " + e.employeeId);
    System.out.println();
    }}


  2. #2
    Member snowguy13's Avatar
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    Default Re: Needs help with code

    Accessor methods are your get() methods; they allow outside classes to access the private members of another class.

    For example:

    public class ClassA
    {
     
       private int number;
     
       public ClassA(int theNumber)
       {
     
          number = theNumber;
     
       }
     
       //Now, we make a get() method for number, because it is private
       //and cannot be accessed by other classes
       public int getNumber()
       {
     
          return number;
     
       }
    }

    public class ClassATest
    {
     
       public static void main(String[] heeheeNotCallingThisArgs)
       {
     
          ClassA test = new ClassA(5);
     
          int cake = test.number; //This would throw an exception, since number is private
          int otherCake = test.getNumber(); //This works, because getNumber() is public
     
       }
    }

    Now, your modifier methods are your set() methods. I really have no clue why you'd want them to be private; this would mean that there's no way to edit the values in your class. Usually set() methods are public. Here's what a typical set() method looks like (using that previous class):

    public class ClassA
    {
     
       private int number;
     
       public ClassA(int theNumber)
       {
     
          number = theNumber;
     
       }
     
       public int getNumber()
       {
     
          return number;
     
       }
     
       //Now we'll add the modifier (set) method, so that number's value can be changed
       public void setNumber(int newNumber)
       {
     
          number = newNumber;
     
       }
    }

    public class ClassATest
    {
     
       public static void main(String[] heeheeNotCallingThisArgs)
       {
     
          ClassA test = new ClassA(5);
     
          test.number = 2; //This would throw an exception, since number is private
          test.setNumber(2); //This works, because setNumber() is public
     
       }
    }

    Does that clear things up at all?
    Last edited by snowguy13; February 25th, 2012 at 11:18 AM.
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