CODEWITHSUNDEEP
javalist
error404
error404

Reputation: 3

How to cast two objects

I am new in java and i dont know how can I solve the problem. My problem is that I have a list with sacks and every stack have persons inside and the persons a string(Name). so list -> stack-> person with name

My question is how can I get the name?

((Stack)list.getObject() getObject gives me the current object in the list(this works) but I have no idea for the name :((Stack)list.getObject().(Person)stack.top().Name was one idea but it's wrong

Upvotes: 0

Views: 148

Answers (3)

Derick
Derick

Reputation: 11

You just need more brackets but it's easier to put as different line.

((Person)((Stack)list.getObject()).stack).top().Name

Upvotes: 0

childofsoong
childofsoong

Reputation: 1936

Another option is:

((Person)((Stack)list.getObject()).top()).Name

However, this isn't all that readable, so let's break it down by the steps that we take to get this:

Get the object:

list.getObject()

Cast this to a Stack object:

(Stack)list.getObject()

Call top() on the stack (note parentheses around the last so we know what we're calling it on):

((Stack)list.getObject()).top()

Cast this to a Person object:

(Person)((Stack)list.getObject()).top()

Retrieve the Name field (noting more parentheses again):

((Person)((Stack)list.getObject()).top()).Name

Now, as for readability, I would much more recommend wassgren's answer, but if for some reason you absolutely must have this take up on line, that's how you do it.

Upvotes: 0

wassgren
wassgren

Reputation: 19231

You had the right idea but the wrong syntax. Try this way:

Stack stack = (Stack) list.getObject();
Person person = (Person) stack.top();
String name = person.Name;

Upvotes: 4

Related Questions