Program $1$:

Download and open attached Account.java and AccountTest.java in NetBeans in your assignment source package. Add a method withdraw to Account.java that withdraws money from an Account. Ensure that withdrawal amount does not exceed the Account's balance. If it does, the balance should be left unchaged and the method should print a message indication "Withdraw denied for insufficient fund". Modify the attached AccountTest.java to test the method withdraw.

Program $2$:

Create a class called Invoice in your assignment source package. An Invoice should include four pieces of information as attributes $($instance variables$)-$ a part number of type String, a part description of type String, a purchasing quantity of type Int, and a price per item of type double. Your class should have a full constructor that initializes all the four attributes. Provide a set and a get method for each attribute. In addition, provide a method named getInvoiceTotal that calculates the invoice total, purchasing quantity $*$ price per ite, and returns the invoice total. If the quantity is negative, returns $0.$

Create an test app named Invoice Test in the same package that demonstrates class Invoice's capabilities.