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well i dont have to use add() but i got the answer to the statement i given above but any one plz check that i got it right??

/**
*
* Charlie, Nop, Bum+
*/
import java.util.ArrayList;
...

truthfully this is my assignment but i juz dont know how to store binary nodes in an array list, could anyone help me

here is the question

Specify and design, and implement a class for binary trees where the nodes are stored in an array list, similar to the way that a complete binary tree is usually stored....