polyconstructors.java

java编程思想的部分实现

//:c07:PolyConstructors.java

abstract class Glyph
{
	abstract void draw();
	Glyph()
	{
		System.out.println("Glyph() before draw()");
		draw();
		System.out.println("Glyph() after draw()");
	}
}
class RoundGlyph extends Glyph
{
	int radius=1;
	RoundGlyph(int r)
	{
		System.out.println("RoundGlyph.RoundGlyph(),radius= "+radius);
		radius=r;
		System.out.println("RoundGlyph.RoundGlyph(),radius= "+radius);
	}
	void draw()
	{
		System.out.println("RoundGlyph.draw(),radius= "+radius);
	}
}
public class PolyConstructors
{
	public static void main(String [] args)
	{
		new RoundGlyph(5);
	}
}