How to put array in an object in Java?

Question

I am trying to clone an array and return as an object, not an array type. z

 public IntVector clone()
 {

     IntVector cloneVector = new IntVector(3);

     int[] newItems = new int[10];
     for(int i=0 ; i<itemCount_; ++i)
      {
      newItems[i] = items_[i];
      }

     cloneVector = newItems; // is there a way to do something like this??

    return cloneVector;
 }

Main method looks like this

  public static void main(String[] args)
  {

   IntVector vector = new IntVector(5);

   vector.push(8);
   vector.push(200);
   vector.push(3);
   vector.push(41);

   IntVector cloneVector = vector.clone();
  }

*there are two other methods which makes an array:IntVector() and puts value into array:push()

You should call the cloneVector.push(newItems[i]). Show us your code please. — KV Prajapati
– KV Prajapati, Commented Sep 16, 2012 at 7:50

Keith Randall · Accepted Answer · 2012-09-16 07:56:13Z

1

Declare a new constructor for IntVector which takes an int array and a count:

IntVector(int[] data, int n) {
  items_ = data.clone();
  itemCount_ = n;
}

Then you can write clone like this:

public IntVector clone() {
  return new IntVector(items_, itemCount_);
}

You can make that new constructor private if you like, so only clone can use it.

answered Sep 16, 2012 at 7:56

Keith Randall

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2 Comments

sblck Over a year ago

This works, but I can't understand how it is working. What does the constructor doing?

Keith Randall Over a year ago

The constructor makes a new IntVector by copying the array and count from the old IntVector.

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