gistfile1.java

public class GenericsTest {
	
	public class Shape {}
	public class Circle extends Shape {}
	public class Sphere extends Circle {}
	
	public class ShapeDescriber<T extends Shape> {
		public void describe(T s) {}
	}
	
	public class CircleDescriber<T extends Circle> extends ShapeDescriber<T> {
		public void describe(T s) {
			super.describe(s);
		}
	}
	
	public class SphereDescriber<T extends Sphere> extends ShapeDescriber<T> {
		public void describe(T s) {
			super.describe(s);
		}
		
		public void testTheThing() {
			this.describe(new Sphere());
		}
	}
}