Swing Components and Containers

• Swing contains two key items i.e components and containers.
• Components are independent visual controls.
• Conatiners builts a group of components.
• Swing Containers  are of two types light-weight and heavy-weight.
• All components of swing are derived from JComponent class.
• JComponent do inherit component class and container class of awt.
• JFrame, JApplet, JDialog and JWindow these are all swing containers but they do not inherit JComponent instead they directly inherit component and container class of awt.
• Since awt is heavy-weight because it is platform independent, JFrame, JApplet, JDialog and JWindow do inherits awt component and container class and hece they are also heavy-weight.
• Top-level containers are not containd within any other container.
• All the swing component which inherits JComponent class are light-weight.
• An example of light-weight container is JPanel which is a general purpose container.
• Swing components are available in javax.swing package and some of the swing  events which are not defined in AWTEvent class are present in javax.swing.event  package

✭Swing components Constructor

• JButton

1. JButton();
2. JButton(String str);
3. JButton(ImageIcon image);
4. JButton(String str, ImageIcon image);

• JLabel

1. JLabel();
2. JLabel(String str);
3. JLabel(Icon image);
4. JLabel(String str, Icon image, int horizotalAlignment);
5. JLabel(String str, int horizotalAlignment);

• JRadioButton

1. JRadioButton()
2. JRadioButton(Action a)
3. JRadioButton(Icon icon, boolean selected)
4. JRadioButton(String text, boolean selected)RadioButton(String text, Icon icon)
5. JRadioButton(String text, Icon icon, boolean selected)

• JComboBox

1. JComboBox()
2. JComboBox(ComboBoxModel aModel)
3. JComboBox(Object[] items)
4. JComboBox(Vector<?> items)