I need some help in trying to find out how to cast a method that is within an object which is inside a LinkedList.

Let me try to explain:

I already know that I have to use a wrapper to convert an object back into another state. The think I am confused about is how to use a method from the object. What I am doing is storing Objects called Item into a LinkedList. I have a method from Item that gets a stored variable. Heres the code for my Item class.

public class Item implements Comparable
	private int myId;
	private int myInv;
	public Item(int id, int inv)
		myId = id;
		myInv = inv;
	public int getId() 
		return myId;
	public int getInv() 
		return myInv;
	public int compareTo(Object otherObject) 
		Item right = (Item)otherObject;
		return myId - right.myId;
	public boolean equals(Object otherObject) 
		return compareTo(otherObject) == 0;
	public String toString() 
		String string = (getId() + "  " + getInv());
		return string;

From my experience so far, Arrays with stored objects only need to method call after referencing it.

int id = myArray[index].getId()

What I tried was:

int id = myList.get(index).getId();

I knew that this aproach probably wouldn't work anyway. So right now I need someone to help me to understand how to call a method from an object within a LinkedList.

Thanks in advanced,

Lord Felix

13 Years
Discussion Span
Last Post by Meldroz

You need to explicitly cast the object you retrieve from the List to the correct type unless you use a 1.5 level compiler in which case you can use generics to declare the List to only accept a specific type (and thus do the cast for you on retrieval).

You'd then declare the List as:

List<Item> myList = new LinkedList<Item>();

Hey there,

int id = myList.get(index).getId(); // yeah this line could work

The only problem is your storing objects, the list doesn't know at run time what kind of object is stored there i think. You would have cast it like jwenting said.

Item t = (Item)myList.get(index);
int id = t.getId();

This would work i think.

good luck,

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