solve this problem using java

Problem #1: Electronic Shop Your friend wants to open an online store where he will sell only electronic goods. He has asked you to develop the application for the store. He wants the following functionalities for his store. 1) Stock-in existing products. Assume you have 3 washing machines and you want to bring 2 more washing machines in your store, you will use this method. This method which will increase the number of washing machines by the amount you purchased (for the example above it will be 5). 2) Add new item to the store This is for stock-in brand new items in the store which was not there before. 3) Sell a specific item Assume there are 5 washing machines and if you sell 1, there will be 4 left in your store. 4) Give sale on a specific category of item and brand (e.g. 10% sale on Cannon Camera). 5) View item list with details (e.g. name, brand, category, price, count, whether the item is on sale or not etc.) 6) View the items on Sale