Added equals() and hashCode() to Centroid

src/main/java/io/github/auberonedu/equalsLivecode/App.java

@@ -13,11 +13,22 @@ public static void main(String[] args) {
 
         Centroid locA = new Centroid(4, 9, "Salamander");
         Centroid locB = new Centroid(4, 9, "Salamander");
+        Centroid locC = locA; // Assignment operator; thing on the left points to the thing on the right
 
-        System.out.println("Result of locA == locB " + (locA == locB));
-        System.out.println("Result of locA.equals(locB) " + locA.equals(locB));
+        System.out.println("Result of locA == locB " + (locA == locB)); // false
+        System.out.println("Result of locA.equals(locB) " + locA.equals(locB)); // false
+        System.out.println("Result of locA == locA " + (locA == locA)); // true
+        System.out.println("Result of locA == locC " + (locA == locC)); // true
 
-        videoDemo();
+        Set<Centroid> centroids = new HashSet<>();
+        centroids.add(locA);
+        System.out.println(centroids.contains(locB));
+
+        Location a = new Location(1, 5, "Salamander");
+        Location b = new Location(1, 5, "Salamander");
+        System.out.println("Locations a and b are the same: " + a.equals(b));
+
+        // videoDemo();
     }
 
     // We will look at this a bit later in the livecode, please ignore for first part

src/main/java/io/github/auberonedu/equalsLivecode/Centroid.java

@@ -22,4 +22,61 @@ public int getC() {
     public String getName() {
         return name;
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + r;
+        result = prime * result + c;
+        result = prime * result + ((name == null) ? 0 : name.hashCode()); // Strings have their own hashcode
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        Centroid other = (Centroid) obj;
+        if (r != other.r)
+            return false;
+        if (c != other.c)
+            return false;
+        if (name == null) {
+            if (other.name != null)
+                return false;
+        } else if (!name.equals(other.name))
+            return false;
+        return true;
+    }
+
+
+
+    // @Override
+    // public boolean equals(Object o) {
+    //     // if null, return false
+    //     if (o == null) return false;
+    //     // if a different class, return false
+    //     if(getClass() != o.getClass()) return false;
+
+    //     // At this point, we can assume these are both non null and the same class
+    //     Centroid other = (Centroid) o; // casting (Type)
+
+    //     // Check each part (this can be more concise, but we're making it more readable)
+    //     // these primitive ints cannot be null
+    //     if (r != other.r) return false;
+    //     if (c != other.c) return false;
+    //     // name might be null, so needs handled differently
+    //     if (name == null) {
+    //         if (other.name == null) return true;
+    //         if (other.name != null) return false;
+    //     }
+    //     if (!name.equals(other.name)) return false;
+
+    //     return true;
+    // }
 }

src/main/java/io/github/auberonedu/equalsLivecode/Location.java

@@ -0,0 +1,4 @@
+package io.github.auberonedu.equalsLivecode;
+
+public record Location(int x, int y, String label) {   
+}