@@ -0,0 +1,351 @@
+package org.psjava.goods;%0A%0Aimport org.psjava.algo.geometry.convexhull.ConvexHullAlgorithm;%0Aimport org.psjava.algo.geometry.convexhull.GrahamScan;%0A%0Apublic class GoodConvexHullAlgorithm %7B%0A%0A%09public static ConvexHullAlgorithm getInstance() %7B%0A%09%09return GrahamScan.getInstance(GoodSortingAlgorithm.getInstance());%0A%09%7D%0A%0A%09private GoodConvexHullAlgorithm() %7B%7D%0A%7D%0A

introduce GoodConvexHullAlgorithm