In Java, every part of a graphical user interface is represented by a class in the Swing or Abstract Windowing Toolkit packages. There is a JButton class for buttons, a JWindow class for windows, a JTextField class for text fields, and so on.
To create and display an interface, you create objects, set their variables, and call their methods. The techniques are the same as those you used during the previous three hours as you were introduced to object-oriented programming.
When you are putting a graphical user interface together, you work with two kinds of objects: components and containers. A component is an individual element in a user interface, such as a button or slider. A container is a component that can be used to hold ...