jls05_arrayconv.java

class Point {
	int x, y;
	Point(int x, int y) { this.x = x; this.y = y; }
	public String toString() { return "("+x+","+y+")"; }
}
public interface Colorable { void setColor(int color); }
public class ColoredPoint extends Point implements Colorable 
{
	int color;
	ColoredPoint(int x, int y, int color) {
		super(x, y); setColor(color);
	}
	public void setColor(int color) { this.color = color; }
	public String toString() {
		return super.toString() + "@" + color;
	}
}
class Test {
	public static void main(String[] args) {
		Point[] pa = new ColoredPoint[4];
		pa[0] = new ColoredPoint(2, 2, 12);
		pa[1] = new ColoredPoint(4, 5, 24);
		ColoredPoint[] cpa = (ColoredPoint[])pa;
		System.out.print("cpa: {");
		for (int i = 0; i < cpa.length; i++)
			System.out.print((i == 0 ? " " : ", ") + cpa[i]);
		System.out.println(" }");
	}
}