Java Swing - GUIs
TOPIC 03 – MORE ON COMPONENTS

LESSON NOTE

In this lesson, we will look at components more closely. The components in Swing are called JComponents (though we often simply say Components).

SETTING COMPONENT COLOUR

We can set the colour of a JComponent by using the setBackground(Color) method. The following line makes a JButton btn blue.

btn.setBackground(Color.blue);

The following image shows a blue JButton and a green JTextField.

OTHER TYPES OF LISTENERS

Other than ActionListeners, there are other types of Listeners such as ItemListener. They work in a very similar way as ActionListener but are triggered at different times. For example, some may be triggered if the component is clicked on, some if the component changes states and some at many times when the component is being altered.