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Stack based LinkedList implementation 1. Go to the List interface and add a method to get the value of the head You should also add the implementation of the method the the Linkedt ist and DoublyL inkedl ist classes. public E gethead(H if (I enpty()) return head, data; return notly 2. The Stack class class Stackel > iaplenents StackhdT f 1/Tos0 ) Implementing the checkBalance method Given an expression string exp, write a program to examine whecher the pairs and the orders of 7,7,+6,7,[,] are correct in exp. static boolean checkealance(string expr\} \{ 1/TeDo