asked on

without using iteration) can i know in the arraylist of Housedocumentcharges Object whether 620 chargeid is there or not?Is there any method is there in arraylist or in collections?

i have arraylist of Housedocumentcharges Object;in this i have different chargid's and chargesdescription will be stored.

in the arraylist if the chargeid is 620 is there i dont want to enter into UserInputModel method;

I can solve the problem using below code.but without using for loop(or using iteration) can i know in the arraylist of Housedocumentcharges Object whether 620 chargeid is there or not?Is there any method is there in arraylist or in collections?

if(chargesList1!=null && chargesList1.size()>0)
{
      for(int i=0;i<chargesList1.size();i++)
      {
            houseDocumentCharges = (HouseDocumentCharges)chargesList1.get(i);
            if(houseDocumentCharges.chargeId.equals("620"))
            continue;

      userInputModel = new UserInputModel(vndrList,"vendorIdLabel", ValidationConstants.MULTI_VENDOR_VALIDATION_NAME,4);
      validationModel.addUserInput("Vendor(s)",userInputModel);
      }
}

zzynx

ArrayList has a method contains()

zzynx

public boolean contains(Object elem)

Returns true if this list contains the specified element.

Parameters: elem - element whose presence in this List is to be tested.
Returns: true if the specified element is present; false otherwise.

Mick Barry

if (chargesList1.contains("620"))
{
...

Mick Barry

You can also use i=the indexOf() method to get the index

int index = chargesList1.indexOf("620");
if (index==-1)
{
// not there
}
else
{
// its in list
}

Mick Barry

http://java.sun.com/j2se/1.4.2/docs/api/java/util/ArrayList.html#contains(java.lang.Object)
http://java.sun.com/j2se/1.4.2/docs/api/java/util/ArrayList.html#indexOf(java.lang.Object)

zzynx

So,

chargesList.contains(...)

but the parameter you pass must be the exact object you're looking for (equals() must be true)

zzynx

>> but the parameter you pass must be the exact object you're looking for (equals() must be true)
So, a simple
if (chargesList1.contains("620"))
won't work, since your arraylist doesn't contain Strings but Housedocumentcharges objects

chaitu chaitu

ASKER

so contains and indexOf won't work here.........any other alternative

zzynx

>> so contains and indexOf won't work here.
I didn't say that.

**If** your Housedocumentcharges class has equals() & hashCode() methods
that are based on the chargeId, then passing a new Housedocumentcharges object with chargeId "620" is sufficient:

if ( chargesList1.contains( new Housedocumentcharges("620") )

ASKER CERTIFIED SOLUTION

zzynx

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chaitu chaitu

ASKER

we haven't implemented these two methods in HouseDocumentCharges class and also the Housedocumentcharges constructor

public boolean equals(Object obj) {
return chargeId.equals( ((Housedocumentcharges)obj).getChargeId() );
}
public int hashCode() {
return getChargeId().hashCode();
}

zzynx

>> we haven't implemented these two methods
Well, if you want to use contains() you should ;°)

chaitu chaitu

ASKER

we dont have get set methods in bean class only public variables defined like public String chargeId.so now i written below one in bean class

public HouseDocumentCharges(String chargeId) {
this.chargeId = chargeId;
}

public boolean equals(Object obj) {
return chargeId.equals( ((HouseDocumentCharges)obj).chargeId );
}
public int hashCode() {
return chargeId.hashCode();
}

zzynx

Thanks for accepting