File: p48.java

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// From "The Java Language Specification", page 48

public interface Colorable {
        void setColor(byte r, byte g, byte b);
}

class Point { int x, y; }

class ColoredPoint extends Point implements Colorable {
        byte r, g, b;

        public void setColor(byte rv, byte gv, byte bv) {
                r = rv; g = gv; b = bv;
        }
}

class Test {
        public static void main(String[] args) {
                Point p = new Point();
                ColoredPoint cp = new ColoredPoint();
                p = cp;
                Colorable c = cp;
        }
}