When you update the data used to draw shapes on a component, you must call the repaint method to force a call to the paint or paintComponent methods.

Question

Quizplus · Accepted Answer

Calling the repaint method is necessary to ensure that the updated data will be correctly displayed on the component. Without calling this method, the old data may still be displayed or the component may not be redrawn at all.

When You Update the Data Used to Draw Shapes on a Component