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  1. #1
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    Feb 2013
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    Default Help with constructors

    I'm having some trouble getting information from a different class using a constructor,

    This is the main method where I'm calling for information from another class:

    public class StudentTest {

    public static void main(String[] args)

    Person[] personObjects = new Person[2];

    personObjects[0] = new Student("John", "Jones", "Business", 3.4, 28);
    personObjects[1] = new Student("Joseph", "Smith", "Liberal Arts", 1.3, 27);


    The Student class is a subclass of Person, the code for Person is:

    public class Person {

    private String firstName;
    private String lastName;
    private String idSSN;

    //person constructor
    public void Person(String fName, String lName, String SSN)
    firstName = fName;
    lastName = lName;
    idSSN = SSN;

    //set methods (3)
    public void setFirstName(String fName)
    firstName = fName;

    public void setLastName(String lName)
    lastName = lName;

    public void setSSN(String SSN)
    idSSN = SSN;

    //get methods (3)
    public String getFirstName()
    return firstName;

    public String getLastName()
    return lastName;

    public String getSSN()
    return idSSN;

    //get full name string
    public String getFullName()
    return String.format("%s %s", getFirstName(), getLastName());

    For some reason when I run the main method above, I get the results, "null null". Anybody know why it isn't storing the data?
    Any help is greatly appreciated.

  2. #2
    Fubarable's Avatar
    Fubarable is offline Moderator
    Join Date
    Jun 2008
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    Default Re: Help with constructors

    Please edit your post and wrap the code in code tags.
    BB Code List - Java Programming Forum - Learn Java Programming

    Note that your Person class has no constructor. Instead it has a "pseudo" constructor since constructors have no return type, not void, not anything.

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