Lecture 16: GUI programming JFrame windows (p.247) Containers and layout managers (p.290) Inheriting GUI components (p.330) Chapter 12: GUI programming Skip Chapters 10 and 11 for now but will return to them soon

JFrame Windows (p.247) All JXxxx classes are part of swing JFrame extends Frame (in awt) Frame extends Window Window extends Container Container extends Component Component extends Object

JFrame methods JFrame frame1 = new JFrame(); frame1.setTitle(“Window 1”); frame1.setSize(200,150); frame1.setLocation(200,100); frame1.setDefaultCloseOperation(JFram e.EXIT_ON_CLOSE);

Containers and Layout Managers (p.290) We can add various components to a frame window, such as buttons JButton yesButton = new JButton(“yes”); frame1.add(yesButton); frame1.setVisible; JButton noButton = new JButton(“no”); frame1.add(noButton); frame1.setVisible() The “no” button overwrote the “yes” button. To avoid that we use FlowLayout

FlowLayout FlowLayout layout = new FlowLayout(); frame1.setLayout(layout) these lines go before you start adding components after adding components, need to call setVisible

Inheriting GUI components (p.330) Suppose we want to design a frame window and then construct multiple instances of it public class OurFrame extends JFrame{ –public OurFrame() { –…–… –}–} Then we can construct multiple instances of OurFrame

Chapter 12: more details Container classes (JFrame, JPanel, JApplet, etc) Component classes (JButton, JLabel, JTextField, JCheckBox, JRadioButton, JComboBox, JMenu, etc) Helper classes (FlowLayout, GridLayout, Color, Font, Graphics, etc

GridLayout and Color Gridlayout layout = new GridLayout(5,3); –specifies horizontal and vertical grid Color color = new Color(128,128,128) –specifies red, green, blue –button.setBackground(color); –button.setForeground(color); –random colors