CODEWITHSUNDEEP
javaclassarraylist
Oliver-R
Oliver-R

Reputation: 23

ArrayList to Access Methods in Classes

Is it possible to create an ArrayList that contains new instances of a Class and then use that ArrayList to access methods in the given class? Here is an example to make it more clear:

ArrayList<myOtherClassName> myClassObjects= new ArrayList<myOtherClassName>();
myClassObjects.add(new myOtherClassName());
myClassObjects.indexOf(1).methodInOtherClass();

This, however, doesn't work! Is there a way to achieve what I want?

Upvotes: 0

Views: 1869

Answers (3)

Srinivas
Srinivas

Reputation: 147

@Oliver-R...

Try Below Code 

ArrayList<myOtherClassName> myClassObject = new ArrayList<myOtherClassName>();
myClassObject.add(new myOtherClassName());
myClassObject.get(0).methodInOtherClass();

the method methodInOtherClass() return type is void it will not return any thing other

Upvotes: 0

Ankit
Ankit

Reputation: 3181

Use:

ArrayList<myOtherClassName> class1 = new ArrayList<myOtherClassName>();
class1.add(new myOtherClassName());
class1.get(0).methodInOtherClass();

You need to:

  • call .get() method instead of .indexof()

indexof method returns the index, and not the value/object from the list.

Also, Always write 

List<myOtherClassName> class1 = new ArrayList<myOtherClassName>();

instead of 

ArrayList<myOtherClassName> class1 = new ArrayList<myOtherClassName>();

ArrayList is a implementation of List, you should ALWAYS create object of type interface rather than of the implementation class.

Upvotes: 2

iCode
iCode

Reputation: 9202

Don't use class as variable.

indexOf() will return an integer. Use get() instead

ArrayList<myOtherClassName> mylist = new ArrayList<myOtherClassName>();
mylist.add(new myOtherClassName());
mylist.get(0).methodInOtherClass();

Upvotes: 1

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