Add Lecture01 Skeleton

DoggieAnimation.java

+public class DoggieAnimation {
+    public static void main(String[] args) {
+        // Setup Canvas and Scale
+        StdDraw.setCanvasSize(1024, 768);
+        StdDraw.setScale(-1024, 1024);
+
+        IntBag bag = null;
+
+        // Add each picture once
+        for (int i = 1; i <= 10; i++) {
+            bag.add(i);
+        }
+
+        // Add my favorite picture many times
+        for (int i = 0; i < 10; i++) {
+            bag.add(3);
+        }
+
+        while (true) {
+            // get next picture name
+            String pic = "pictures/hopper" + bag.pick() + ".jpg";
+            // draw it
+            StdDraw.picture(0, 0, pic);
+            // pause
+            StdDraw.pause(2000);
+            System.out.println(pic);
+        }
+    }
+}

IntBag.java

+/**
+ * An IntBag represents a multiset of integers between min and max.
+ * That is, each number between min and max can occur some non-negative
+ * number of times in a particular IntBag.
+ */
+public class IntBag {
+
+    // constructors in java are like __init__ in python
+    public IntBag(int min, int max) {
+
+    }
+
+    /**
+     * Adds one instance of value to this IntBag.
+     * @param value the value to be added
+     */
+    public void add(int value) {
+
+    }
+
+    /**
+     * Returns true when the bag has no instances of any elements
+     * and false otherwise.
+     * @return true iff the bag is empty
+     */
+    public boolean isEmpty() {
+        return false;
+    }
+
+    /**
+     * Chooses (but does not remove) a uniformly random element from this
+     * IntBag in proportion to how many elements exist for each number.
+     * @return the element picked from the bag
+     */
+    public int pick() {
+        return -1;
+    }
+}