Copy ArrayLists in Java

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I have two arrayLists diferent types.....

Java

ArrayList<Ergazomenos> erg = new ArrayList<Ergazomenos>();
ArrayList<Proistamenos> proist = new ArrayList<Proistamenos>();
copy(erg, proist);

I dont know how to copy ergazomenos to proistamenos. Can i use arraycopy?

Posted 12-Dec-10 9:34am

nikosv

Updated 12-Dec-10 9:36am

Henry Minute

v2

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Manfred Rudolf Bihy · Answer 1 · 2010-12-12T09:43:00

Solution 1

Hi Nikosv!

Java

import java.util.ArrayList;
import java.util.Collections;
Collections.copy(arrayList2,arrayList1);
//alternatively copyOfList = new ArrayList<Proista>((ArrayList<Proista>)listOfErgozToCopy);

This should work if Ergazos were derived from Proistas.

Cheers

Manfred

Posted 12-Dec-10 9:43am

Manfred Rudolf Bihy

Updated 12-Dec-10 9:44am

v2

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nikosv 12-Dec-10 17:02pm

hanks for the answear Manfred.
I want to copy all Ergazomenos to Proistamenos. Could you explain this?

copyOfList=new ArrayList((ArrayList)listOfErgozToCopy);

What is copyOfLIst and listOfErgozToCopy?
thanks anyway