Deep copying using clone method

Question

Hello guys i am trying to deep copy class A. Im having trouble deep copying class A. subscriptions is an array reference that holds the objects of SubscriptionYear. Could someone help me out using the clone method to do a deep copy.

public class A {

private String countryNames;
private SubscriptionYear[] subscriptions;
private int size;
private int location;

public A(String country)
{
    this.countryNames = country;
}
public A(String country, int arraylength)
{
    this.countryNames = country;
    this.size = arraylength;
    subscriptions = new SubscriptionYear[size];
    location = 0;
}
//adds the subscription.
public void addSubscriptionYear(int year, double subscription)
{
        subscriptions[location]= new SubscriptionYear(year, subscription);
        ++location;
}

SubscriptionYear:

public class SubscriptionYear {

private int year;
private double subscriptions;

public SubscriptionYear(int year,double subscriptions)
{
    setYear(year);
    setSubscription(subscriptions);
}
public void setYear(int Year)
{
    this.year= Year;
}
public void setSubscription(double value)
{
    this.subscriptions = value;
}
public int getYear()
{
    return year;
}
public double getSubscription()
{
    return subscriptions;
}

possible duplicate of [How do you make a deep copy of an object in Java?](http://stackoverflow.com/questions/64036/how-do-you-make-a-deep-copy-of-an-object-in-java) — LeffeBrune, Nov 12 '14 at 04:13

Jason · Answer 1 · 2014-11-12T05:31:05.917

0

public Object clone() {
    A newA = new A(countryNames);
    newA.size = size;
    newA.subscriptions = new SubscriptionYear[size];
    for(SubscriptionYear subYear : subscriptions) {
        newA.addSubscriptionYear(subYear.getYear(), subYear.getSubscription());
    }
    return newA;
}

edited Nov 12 '14 at 05:31

answered Nov 12 '14 at 04:01

Jason

11,744
3
42
46

i added SubscriptionYear class – kendra SMITH Nov 12 '14 at 05:07
If you want to perform a deep copy, SubscriptionYear will need to expose getters so that we can read the values stored inside it, or a clone method so that we can deep clone it. – Jason Nov 12 '14 at 05:14
sorry forgot to add the setters and getters. i modified the code – kendra SMITH Nov 12 '14 at 05:30

score 0 · Accepted Answer · answered Nov 16 '14 at 00:42

Ok i solved my problem. this solution addressed my issue:

public Object clone() {
A newA = new A(this.countryNamse, this.arraylength);

for(int i=0;i<this.newA.subscriptions.length;i++) {
   newA.subscriptions[i] = subscriptions[i[]; 
 }
return newA;
 }

Deep copying using clone method

2 Answers2