Chapter 14: Problem 18

In an \(A W T\) component, or a class that extends JApplet or JPrame, if you want to get a reference to the Graphica object, do you override the paint or paintcomponent method?

Short Answer

Expert verified

To get a reference to the Graphics object, you should override the paint method for an AWT component and the paintComponent method for classes extending JApplet or JFrame in a custom JPanel subclass.

Step by step solution

Understand AWT components and Swing components

AWT (Abstract Window Toolkit) components are part of the older Java GUI programming framework. In contrast, Swing components provide a more modern and flexible approach to GUI programming in Java. JApplet and JFrame are part of the Swing framework.

Difference between paint and paintComponent methods

The paint method is used for AWT components, while the paintComponent method is used for Swing components (e.g., JApplet or JFrame). Both methods have a Graphics object as a parameter, which can be used to draw shapes and text on the component.

Overriding paint method for AWT components

If you are working with an AWT component, you should override the paint method to get a reference to the Graphics object: ``` public void paint(Graphics g) { super.paint(g); // Drawing operations using the Graphics object (g) go here } ```

Overriding paintComponent method for JApplet or JFrame classes

If you are working with a class extending JApplet or JFrame, you should override the paintComponent method in a custom JPanel subclass to get a reference to the Graphics object: ``` class CustomPanel extends JPanel { @Override protected void paintComponent(Graphics g) { super.paintComponent(g); // Drawing operations using the Graphics object (g) go here } } ``` And then add this custom panel to the JApplet or JFrame class.

Conclusion

To get the reference to the Graphics object for an AWT component, you should override the paint method. For classes extending JApplet or JFrame, you should override the paintComponent method in a custom JPanel subclass.

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In an \(A W T\) component, or a class that extends JApplet or JPrame, if you want to get a reference to the Graphica object, do you override the paint or paintcomponent method?

Short Answer

Step by step solution

Understand AWT components and Swing components

Difference between paint and paintComponent methods

Overriding paint method for AWT components

Overriding paintComponent method for JApplet or JFrame classes

Conclusion

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