asked on

contains( ) method of ArrayList method

hi experts

I have a method listCounties() which returns a list of countyId fields.
I have a valueObject RegionVO which contains a field regionId.

Now My requirment is if "countyId" field 'contains' regionId or a part of regionId "do somtehing"
i have written something like this

Collection counties= listCounties(); //listCounties returns list of countyId

if (counties.contains(""+regionVO.getRegionId()))
{

do something
}

But counties is not getting recognized since its not being typecasted to the CountiesVO value object.

I can do somthing like this to get the individual elements but then i wont be ABLE to use "contains" method of Collection.
for (Iterator countyIt = counties.iterator();
countyIt.hasNext(); ) {
CountiesVO countyVO = (CountiesVO) countyIt.next();

}

any sugessions greatly appreciated

thanks
J

CEHJ

You need to override equals

CEHJ

Since regionId would be, i guess, unique, you could use that as the basis of the equals implementation for CountiesVO

jaggernat

ASKER

>>>>>You need to override equals

could you please elaborate .

thaNKS FOR prompt response

jaggernat

ASKER

>>>>Since regionId would be, i guess, unique, you could use that as the basis of the equals implementation for CountiesVO

yes i thought about it. but i am not sure if i can use the "equals implementation"

this is the scenario:

region Id of RegionVO is value "3401"
countyId of CountyVO is value "34017" . so my requirment in that case would be if regionId is a "part of" countyId --> condition is satisfied-->do something.

any help appreciated

CEHJ

Question first:

>>Now My requirment is if "countyId" field 'contains' regionId

would countyId.equals(regionId) be true?

jaggernat

ASKER

would countyId.equals(regionId) be true?

No.
regionId can only be PART OF countyId

thanks

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CEHJ

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jaggernat

ASKER

>>>>You'll simply have to iterate explicitly

can you please tell me how to do that???

CEHJ

Well you already posted some iterating code yourself. All you need to do is:

CountiesVO countyVO = (CountiesVO) countyIt.next();
if (countyVO.getId().indexOf(regionVO.getId()) > -1) {
//matched
}

jaggernat

ASKER

thanks