java vector to arraylist

Question

Is there any way to copy or convert a vector to arraylist in Java?

Jon Skeet · Accepted Answer · 2010-08-09 12:45:14Z

66

Yup - just use the constructor which takes a collection as its parameter:

Vector<String> vector = new Vector<String>();
// (... Populate vector here...)
ArrayList<String> list = new ArrayList<String>(vector);

Note that it only does a shallow copy.

answered Aug 9, 2010 at 12:45

Jon Skeet

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3 Comments

amdev Over a year ago

complexity is o(n) ?

Jon Skeet Over a year ago

@amdev: Yes, exactly.

user6249539 Over a year ago

@JonSkeet Thank you, this helped.. I dint want to go with Iterator approach and all because of large chunk of data.. hence this helped.. better than iterating and populating the arrayList

Kevin Parker · Accepted Answer · 2011-10-21 14:13:17Z

2

I just wrote a class to do the same thing, but is more flexible as it will accept Objects accordingly.

public class ExteriorCastor {
    public static  ArrayList vectorToArrayList(Vector vector){
        if (vector == null){return null;}
        return new ArrayList<Object>(vector);
    }
}

answered Oct 21, 2011 at 14:13

Kevin Parker

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Comments

John Conde · Accepted Answer · 2012-10-23 00:20:38Z

0

i´m not sure if it is length() or size().... but the idea is the next:

ArrayList<Object> a;

for(int i = 0;i < Vector.length() ; i++)

    a.add(Vector.elementAt(i); // Again... i´m not sure if this is elementAt() or get()

Vector.finalize();

edited Oct 23, 2012 at 0:20

John Conde

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answered Oct 23, 2012 at 0:02

Javier

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