why this method returns null ? please help

[rian bron]

Hello guys, i am kinda new to java, but when i am looking for the mistake, i can't find it . it looks fine. can you tell me where is the problem and how to fix it? thank you :

public class Date
{
    private int _day;
    private int _month;
    private int _year;
    public Date(int d, int m, int y)
    {
        _day=d;
        _month=m;
        _year=y;
    }

    public Date (Date other)
    {
        other._day=_day;
        other._month=_month;
        other._year=_year;
    }

    public int getDay()
    {
        return _day;
    }

    public int getMonth()
    {
        return _month;
    }

    public int getYear()
    {
        return _year;
    }

    
    public String toString()
    {
        return _day+"/"+_month+"/"+_year;
    }
}

 public class Message
{
   private String _sender;
   private String _subject;
   private String _content;
   private Date _date;
    public Message(String send,String sub,String count,Date d)
   {
   _sender= send;
   _subject=sub;
   _content=count;
   _date=d;
    }
  
public String getSender()
{
    return this._sender;
}
public String getSubject()
{
    return this._subject;
}
public String getContent()
{
    return this._content;
}
public Date getRecDate()
{
    return this._date;
}

public String toString()
{
    return "Sender: "+getSender()+" subject: " +getSubject()+" content: "+getContent()+
    " date: "+getRecDate();
    
}
}

public class MessageTester
{
    public static void main(String[]args)
    {
    Date original_date= new Date(1,1,2019);
    Date other_date=new Date(2,1,1998);
    Message mes1=new Message("[e-mail]","hello ","How are you today?",original_date);
    Message mes2=new Message("google100gmail.com","Subject","how's going?",other_date);  
    System.out.println("mes1: "+mes1.toString());
    System.out.println("mes2: "+mes2.toString());
   
    }
}

output:

mes1: Sender: null subject: null content: null date: null
mes2: Sender: google100gmail.com subject: Subject content: how's going? date: 2/1/1998

why am i receiving null at the first object? and on the second one not?

thank you !

[Jeanne Boyarsky]

When I run your code, I get:
mes1: Sender: [e-mail] subject: hello  content: How are you today? date: 1/1/2019 mes2: Sender: google100gmail.com subject: Subject content: how's going? date: 2/1/1998

The output you describe shouldn't be possible. Maybe try re-compiling in case you aren't running the same code you posted here?

[rian bron]

Jeanne Boyarsky wrote:When I run your code, I get:
mes1: Sender: [e-mail] subject: hello  content: How are you today? date: 1/1/2019 mes2: Sender: google100gmail.com subject: Subject content: how's going? date: 2/1/1998

The output you describe shouldn't be possible. Maybe try re-compiling in case you aren't running the same code you posted here?

i copied the code i run to here, i  don't understand this, maybe i will try to copy these classes into a new file and run it there.

[rian bron]

Jeanne Boyarsky wrote:When I run your code, I get:
mes1: Sender: [e-mail] subject: hello  content: How are you today? date: 1/1/2019 mes2: Sender: google100gmail.com subject: Subject content: how's going? date: 2/1/1998

The output you describe shouldn't be possible. Maybe try re-compiling in case you aren't running the same code you posted here?

even tho i moved these classes to other file. it returns the same output.

[Jeanne Boyarsky]

Are you saying that you still get:
mes1: Sender: null subject: null content: null date: null
mes2: Sender: google100gmail.com subject: Subject content: how's going? date: 2/1/1998

[rian bron]

Jeanne Boyarsky wrote:Are you saying that you still get:
mes1: Sender: null subject: null content: null date: null
mes2: Sender: google100gmail.com subject: Subject content: how's going? date: 2/1/1998

Yes

[zeinab sheikhi]

I've run your code and I got this :
mes1: Sender: [e-mail] subject: hello  content: How are you today? date: 1/1/2019
mes2: Sender: google100gmail.com subject: Subject content: how's going? date: 2/1/1998

[Dave Tolls]

How exactly do you compile and run your code?
If it's from the command line then what directory are you in, and where are your files?