Java notes - GUI graphical interface, data flow

• GUI Design
  • Swing main inheritance relationship

    

    • Top-level container: JFrame\JApplet\JDialog\JWindow
    • Each top-level container has a content pane (ContentPane), and the components in the top-level container except the menu are placed in this content pane
    • Panel (JPane): The panel belongs to the intermediate container and cannot exist independently but can be nested. The panel must be added to other containers
      • FlowLayout: Components are placed one by one on a line in the container. When a line is full, a new line is
        created. Indicates left alignment, right alignment, and centering.
        ​•hgap and vgap set the horizontal and vertical spacing of components
      • BorderLayout
      • GridLayout: grid format
      • CardLayout: The component is regarded as a series of cards, and the order of the cards is determined by the order in which the components are placed in the container
      • BoxLayout: Line up horizontally or line up vertically
        • public BoxLayoutLayout(Container target, int axis); axis-- reverse southeast and northwest
  • event
    • Specify the name of the listener interface to be implemented in the declaration of the event listener class, such as: public class MyListener implements XxxListener { ...}
    • Implement the event processing method in the listener interface public void event processing method name (XxxEvent e) {...//Code for processing an event...}
    • Registration of instances of the listener class can be performed on one or more components. Such as: component object.addXxxListener(MyListener object);

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    • Event Type:

      

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• swing components
  • button
    • JButton

      

    • JToggleButton: Obtain whether the current button is selected through the isSelected() method
      • JRadioButton\JCheckBox: group for grouping, after joining the group, you can only choose single, if you don’t add it, you can choose multiple

        

    • JComboBox: editable and non-editable
      • setEditable(boolean) whether the setting is editable, the default is not editable
    • JList
    • JScrollPane
    • JTextComponent
    • JMenuBar/JPopupMenu
      • JMenu
      • JMenuItem
    • JDialog
    • JOptionPane
    • JFileChooser
• data flow
  • Basic byte data stream InputStream/OutputStream
    • File data stream: FileInputStream and FileOutputStream
      • out.write(in.read());
      • out.write(b, 7, b.length-7);
    • Buffer data stream: BufferedInputStream and BufferedOutputStream
      • The buffer is full of output, flush() forces the output

        

    • Data data stream: DataInputStream and DataOutputStream

      

    • Pipeline data stream: PipedInputStream must be used with class PipedOutputStream to establish a communication channel

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    • Object Stream: ObjectInputStream and ObjectOutputStream
      • Serializable interface: When an object declares to implement the Serializable interface, it indicates that the class has joined the object serialization protocol
    • Character input and output streams: InputStreamReader and OutputStreamWriter
    • Buffer read and write: BufferedReader and BufferedWriter

      

  • file processing
    • File class
    • RandomAccessFile