hi I need to solve these questions today in details, please use java

Task 1: Use the expression trees to build a calculator. The user should enter the expression in infix notation. The calculator should support the following:

1. Construct expression tree from infix expression.
2. Print expression using infix notation.
3. Print expression using postfix notation.
4. Print expression using prefix notation.
5. Evaluate expression; assume that all the operands are numbers

Task 2: The online store system should enable the user to add a new product to the store, and view the products in the store. The store items should have the following information:

• id
• type
• brand
• price
• quantity.

The system should create a BST in which each node maintains a product item. The BST is arranged in terms of the price. The system displays a menu with the following options:

1. Add a new item to the store
2. View items in the store in ascending order of price
3. View items in the store in descending order of price
4. Search for items with a given price.
5. Exit the system