add java examples

java/crtp/Transit.java

@@ -0,0 +1,25 @@
+package patterns.crtp;
+
+import java.util.List;
+import java.util.Map;
+
+import patterns.Point;
+/**
+ * 
+ * @author pouyllau
+ *
+ * @param <T>
+ */
+public class Transit<T extends Transit<T>> {
+
+	T t;
+	
+	
+	public double transit(Point p, List<Point> neighbors, Map<Point, Double> costs) {
+		return  t.transit(p, neighbors, costs);
+	}
+	
+	public static boolean hasCost(Point p ,Map<Point, Double> costs) {
+		return (costs.get(p) != null && costs.get(p) != Double.POSITIVE_INFINITY);
+	}
+}