Java™ Application Development on Linux - Dator

16.7 Getting Down to Cases: Designing a GUI for BudgetPro351(to be put into net/multitool/gui) and the package statement on line 1 ofBudgetPro.java:1 package net.multitool.gui;16.7.1.1 Instance VariablesTake a look at the picture of the BudgetPro GUI. Count the GUI objects thatwe need: four buttons, three labels, and let’s not forget the (empty at first) tableof subaccounts. These are declared in lines 23–31. (Ignore lines 22 and 32for now, we’ll cover them later. Line 34 declares our dialog—more on thatlater, too.)21 // gui components22 private JFrame frame; // needed by dialogs to root themselves23 private JLabel nam;24 private JLabel tot;25 private JLabel val;26 private JButton upton = new JButton(new ImageIcon("net/multitool/gui/back.gif"));27 private JButton creat = new JButton("new subaccount");28 private JButton view = new JButton("view subaccount");29 private JButton clos = new JButton("quit");3031 private JTable list;32 private AbstractTableModel model;3334 private AcctDialog askem; // make once, use often16.7.1.2 MainSkip all the way to the last method of the class, line 289 and following. It’s themain() which gets run when we run this class. If we focus on the major pieceinvolved in getting our GUI together, it’s these lines:JFrame frame = new JFrame("BudgetPro");frame.getContentPane().add(status, ...);frame.getContentPane().add(list, ...);frame.getContentPane().add(buttons, ...);We’re leaving out lots of intermediate text to emphasize the “real” work.We create a JFrame, the outermost window object. We add into it all the other