GUI

Problem: How can a graphical user interface be added to Java programs?

• JFrame allows us to create a window
• We can add various widgets to a window
  • JButton
  • JTextField

• Event driven programming
  • Deep down, a loop is constantly checking for changes
  • We can add an ActionListener to a GUI component
  • An action will cause the actionPerformed method to run

Problem: How can a GUI be organized?

• Useful widgets
  • JLabel
  • JRadioButton
  • JCheckBox
  • JTextArea
  • …many more
• JOptionPane provides very basic I/O
• Layout
  • FlowLayout
  • BorderLayout
  • GridLayout
  • BoxLayout