Is it in Java possible to store classes...
Class1 class1 = new Class1();
...in Arrays/ArrayLists, somehow like this:
ArrayList<> classArray = new ArrayList();
classArray.add(class1);
Obviously this doesn't work, but how could it work?
2 Answers
Of course you can. You just specify the type of objects you want to store when you create the array list:
ArrayList<Class1> classArray = ArrayList<Class1>();
classArray.add(class1);
3 Comments
gi pi
But when there are variable multiple Classes, and I don't know which gets in the ArrayList?
Neo
You either need to make it generic Java object ArrayList<Object> or you need to create a wrapper around it. You can check stackoverflow.com/questions/19602601/…
SergeiTonoian
It is possible to use List<Object>, but I wouldn't do it.
If the class can only be Class1
ArrayList<Class1> list = new ArrayList<Class1>();
Above code won't allow any other class objects it can only store objects of type Class1
If you want to store any class object
ArrayList<Object> list = new ArrayList<Object>();
Object is a parent class of everything in java which is the reason why it can store object of any class
2 Comments
gi pi
Let´s say I have that ArrayList with my class inside, which works fine. But now I want to change a fragment in a certain part of the application to another one, and the other one is the one in my ArrayList. How can I put that ArrayList in:
manager.beginTransaction().replace(R.id.fragment_one, new //ArrayList with Class//).commit(); ?
Rajat Patil
manager.beginTransaction().replace(R.id.fragment_one, new ArrayList( listThatYouWantToPut)).commit(); And remember if you want to add type safety then use new ArrayList<Type>() else ArrayList()
Classobjects than represent a class?Fragment1, which displays a fragment. I want to store that whole Fragment class in a List