Need help on with simple email program

Question

i have been set a task to create a simple email program that has the variables of the sender the recipient the subject the content and a date object representing when the email was sent (this is just to be set to the current system date)
It also needs to include a constructor with four String arguments, i.e the sender, receiver, subject and content. The constructor has to initialise the date of the email then transfer the values of the input parameters to the relevant attributes. If any values of the strings aren'nt given, the string �Unknown� should be set as the value.
I was given a java file to test the one i am to create, but some of the values are not given, if anyone could be of anyhelp or just point me in the right direction then i would be very greatfull, ive posted the code for the test file i have been given below, thanks.
public class SimpleEmailTest {
     public static void main( String[] args ) {
          SimpleEmail email;     // email object to test.
          String whoFrom;          // sender
          String whoTo;          // recipient
          String subject;          // subject matter
          String content;          // text content of email
          static final String notKnown = "Unknown";
          email = new SimpleEmail
(notKnown, notKnown, notKnown, notKnown);
          System.out.println( "SimpleEmail: " +
"\n    From: " + email.getSender() +
"\n      To: " + email.getRecipient() +
"\n Subject: " + email.getSubject() +
"\n    Date: " + 
email.getDate().toString() +
"\n Message: \n" + email.getContent() + "\n";
          email.setSender( "Jimmy Testsender");
          email.setRecipient( "Sheena Receiver");
          email.setSubject( "How are you today?");
          email.setContent( "I just wrote an email class!");
          System.out.println( "SimpleEmail: " +
"\n    From: " + email.getSender() +
"\n      To: " + email.getRecipient() +
"\n Subject: " + email.getSubject() +
"\n    Date: " + 
email.getDate().toString() +
"\n Message: \n" + email.getContent() + "\n";
     }

Answer 1

Start by writing a class named SimpleEmail, implement a constructor with four arguments in it, and the methods that the test code calls, such as the get...() and set...() methods. The class probably needs four member variables too.
public class SimpleEmail {
    // ... add member variables here
    // constructor
    public SimpleEmail(String whoFrom, String whoTo, String subject, String content) {
        // ... add code to the constructor here
    // ... add get...() and set...() methods here
}