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We illustrate essential elements of Java object-oriented programming on the following example.
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The following three classes are declared:
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Point -- a pair of floating point coordinates in a unit square
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Rectangle -- an ordered pair of Points
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Canvas -- a Rectangle with additional color information
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and they are all made Movable (i.e. they all implement Movable interface).
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Declaration of Interface Movable:
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public interface Movable
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{
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static float x = 0.0, y = 0.0;
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public void move(float dx, float dy);
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public void move();
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} // end interface Movable
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