How to remove an element from array of objects?

Question

public class Patient extends Person {
    private String Diagnosis;
    private Appointment[] appointment = new Appointment[2];
    private int numberofAppointment;
    public static int numberOfPatient;

    public void DellappointmentAT(int index) {
        appointment[index].setAvailable(true);
        numberofAppointment--;
    }
}

The class i created, has an Array of object as data fields and i have this method that should remove an element from this array, I want to delete the element without changing the array size.

Normal arrays have a fixed size in Java so you are using the wrong datatype in regard of the requirements here. Use an ArrayList for this task. — akuzminykh
– akuzminykh, Commented Mar 20, 2020 at 5:26

Anthonius · Accepted Answer · 2020-03-20 05:24:18Z

1

Removing an element will impact the array size.

If you really need the initial array to stay the same, there are 2 common approaches:

Create another array so your initial array is not modified
Soft delete - create a remove flag inside the object. That way, you can differentiate between removed data and the array size stays the same

answered Mar 20, 2020 at 5:24

Anthonius

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Maurice Perry · Accepted Answer · 2020-03-20 06:10:21Z

0

How about this:

public void DellappointmentAT(int index) {
    appointment[index].setAvailable(true);
    numberofAppointment--;
    for (int i = index; i < numberofAppointment; ++i) {
        appointment[i] = appointment[i+1];
    }
}

answered Mar 20, 2020 at 6:10

Maurice Perry

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