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+package Project.java;%0A%0Aimport java.awt.event.ActionEvent;%0A%0Aimport javax.swing.JButton;%0Aimport javax.swing.event.ListSelectionEvent;%0A%0Apublic class ManagerFrame extends mainFrame  %7B%0A%09private JButton addItem;%0A%09private JButton removeItem;%0A%09public ManagerFrame(String title) %7B%0A%09%09super(title);%0A%09%09addItem = new JButton(%22Add an item%22);%0A%09%09add(addItem);%0A%09%09removeItem = new JButton(%22Remove an item%22);%0A%09%09add(removeItem);%0A%09%7D%0A%09%0A%09public void actionPerformed(ActionEvent arg0) %7B%0A%09%7D%0A%09%0A%09public void valueChanged(ListSelectionEvent arg0) %7B%0A%09%7D%0A%7D%0A

Create ManagerFrame.java