Task 1
Create a Java application to construct an expression (binary) tree from the postfix expression using Stacks. Note: Construct trees using stacks. For this task, create a binary tree using doubly linked list. Doubly linked list class should be created from scratch and for stack class, you can use JCF Stack class. Write a program to demonstrate.
Task 2
Write a Java program for array-based implementation of a heap. Create following basic methods:
createHeap() // Creates an empty heap.
heapIsEmpty() // Determines whether a heap is empty.
heapInsert(newItem) // Inserts newItem into a heap.
heapDelete() // Retrieves and then deletes a heap’s root item.
Write a program to demonstrate these methods.
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