Adding objects in constructor in Java

Asked Mar 10 '17 at 00:51

Active Mar 10 '17 at 00:51

Viewed 12 times

I'm trying to add every task which has been created in constructor

static private int Id = 0;
private int id = 0;
private Date StartDate;
private Date EndDate;
private static ArrayList<Task> Tasks;
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); 

public Task(java.util.Date StartDate, java.util.Date EndDate) {
    try{
        this.setStartDate(StartDate);
        this.setEndDate(EndDate);
        setId(Id++);

        System.out.println(this.id + this.EndDate.toString() + this.StartDate.toString());
        Tasks.add(this);
    }
    catch(Exception ex){
        System.out.println(ex);
    }
}

It throws NullPointException.

I couldn't find out a way to solve this.

Thanks in advance!

asked Mar 10 '17 at 00:51

NewPHPer

1

debug it. or post the stacktrace – Yohannes Gebremariam Mar 10 '17 at 00:53
1

You haven't initialized `Tasks`. – shmosel Mar 10 '17 at 00:54
1

why do you think `Tasks.add(this);` would work when `Tasks` has not been initialised? – Scary Wombat Mar 10 '17 at 00:54
private static ArrayList Tasks = new ArrayList(); solved the problem. Thank you so much all. – NewPHPer Mar 10 '17 at 00:57

Adding objects in constructor in Java

0 Answers0