hw3: prototype completed

hw3/src/strategy/SortByDate.java

@@ -0,0 +1,14 @@
+package strategy;
+
+import model.Photo;
+
+import java.util.Comparator;
+import java.util.List;
+
+public class SortByDate implements SortingStrategy<Photo> {
+    @Override
+    public List<Photo> sort(List<Photo> photos) {
+        photos.sort(Comparator.comparing(Photo::getDateAdded));
+        return photos;
+    }
+}

hw3/src/strategy/SortByName.java

@@ -0,0 +1,14 @@
+package strategy;
+
+import model.Photo;
+
+import java.util.Comparator;
+import java.util.List;
+
+public class SortByName implements SortingStrategy<Photo> {
+    @Override
+    public List<Photo> sort(List<Photo> photos) {
+        photos.sort(Comparator.comparing(Photo::getName));
+        return photos;
+    }
+}

hw3/src/strategy/SortBySize.java

@@ -0,0 +1,14 @@
+package strategy;
+
+import model.Photo;
+
+import java.util.Comparator;
+import java.util.List;
+
+public class SortBySize implements SortingStrategy<Photo> {
+    @Override
+    public List<Photo> sort(List<Photo> photos) {
+        photos.sort(Comparator.comparing(Photo::getFileSize));
+        return photos;
+    }
+}

hw3/src/strategy/SortingStrategy.java

@@ -0,0 +1,7 @@
+package strategy;
+
+import java.util.List;
+
+public interface SortingStrategy<T> {
+    List<T> sort(List<T> photos);
+}