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To make a drawing, define a new component by subclassing JPanel and overriding the paintComponent () method. This new component can be used just as any other component in a panel. See the calling program in Example - CircleMain.java . /** * methods/CirclePanel.java - Component to draw circles. If the number of formal parameters required by the underlying constructor is 0, the supplied initargs array may be of length 0 or null. If the constructor's declaring class is an inner class in a non-static context, the first argument to the constructor needs to be the enclosing instance; see section 15.9.3 of The Java™ Language Specification. JavaFX Tutorial - Java Circle() Constructor. Back to Circle ↑; Syntax. Circle() constructor from Circle has the following syntax. public Circle() Example. In the following code shows how to use Circle.Circle() constructor.