Please help in dragNdrop info

I would be most grateful if someone would help me in the following:
I am working on DnD. How can the component that
receives the drops know from which component did the drag originate,
i.e. what is being dropped?
For example if I am dropping from
tree1 to tree2. When tree2 receives the drop from tree1, I would
like to check if it is really from tree1 rather then from tree3?
Hope someone can help me.

f stands for float. If you create a number literal 0.5, it defaults to be a double. You put a f (or F works too, I think) after it to indicate you mean it to be a float. The same thing happens for int/long. 2 is int 2, 2L is long 2. It's also similar, although probably more efficient, to this: (float)0.5 or (long)2. It's just a function of the language, nothing to do with the Color class or any other class.

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