Create a GUI application Hello.java with the following widgets: JTextField for the first name, JTextField for the last name, JLabel to provide feedback to the user, and a JButton. When the user selects the button, the JLabel will update per the following "Hello" and concatenate the first and last name together.

Create a class Calculator.java that has two JTextFields, multiply JButton, divide JButton, equals JButton, and a JLabel that present the user with the results.

Create an application Contacts.java. The class extends JFrame and has the following widgets: table, two text fields (name, phone number), and two buttons (Add, Save). The Contacts class will read a file to populate the contacts table. You will need two buttons: add and save. The user can add new contacts by typing the name and number in the text fields. The add button will add the new contact to the table, and the same button will save the lists to a file.