jls5_13.java

public class Point { int x, y; }
public interface Colorable { void setColor(int color); }
public class ColoredPoint extends Point implements Colorable 
{
	int color;
	public void setColor(int color) { this.color = color; }
}
class Test {
	public static void main(String[] args) {
		Point[] pa = new Point[100];
		// The following line will throw a ClassCastException:
		ColoredPoint[] cpa = (ColoredPoint[])pa;
		System.out.println(cpa[0]);
		int[] shortvec = new int[2];
		Object o = shortvec;
		// The following line will throw a ClassCastException:
		Colorable c = (Colorable)o;
		c.setColor(0);
	}

}