So far we have written Java programs that read from stdin or text files and only write to stdout or text files. We will now write Java programs that act like Windows programs, running in a graphical window containing traditional Windows like components such as buttons, text input fields and other graphical controls. The principal class Java uses to represent a Windows like program is the JFrame class. All Java GUI applications are based on JFrame.
SIMPLE GUI (NO EVENTS OR ACTIVE CONTROLS)
HelloJFrame.java
EVENT DRIVEN USING JBUTTON CONTROL AND ACTIONLISTENER INTERFACE
JFrame2.java- JButton, and active control/widget
- multiple classes in a single .java file
- the ActionListener interface
EVENT DRIVEN USING JBUTTONS AND JTEXTFIELDS + INNER CLASS TO IMPLEMENT ACTIONLISTENER
INTRODUCING GRIDLAYOUT THAT DEFINES REGIONS WHERE WIDGETS WILL APPEAR ON CONTENT PANE.
- JButton, JTextField controls interacting
- inner class used to implement ActionListener
