diff --git a/_notebooks/2023-04-26-HW-Rohangroup.ipynb b/_notebooks/2023-04-26-HW-Rohangroup.ipynb
index 6b6a4b5..c7a17a9 100644
--- a/_notebooks/2023-04-26-HW-Rohangroup.ipynb
+++ b/_notebooks/2023-04-26-HW-Rohangroup.ipynb
@@ -96,6 +96,281 @@
     "}\n",
     "SeatingChart.main(null);"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Hack 1"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "vscode": {
+     "languageId": "java"
+    }
+   },
+   "outputs": [],
+   "source": [
+    "//create ArrayLists that satisfy the following\n",
+    "// a) that stores Boolean values\n",
+    "ArrayList<Boolean> boolList = new ArrayList<Boolean>();\n",
+    "// b) that stores Turtle Objects\n",
+    "ArrayList<Turtle> turtleList = new ArrayList<Turtle>();\n",
+    "// c) that initializes with 10 Strings\n",
+    "ArrayList<String> stringList = new ArrayList<String>(Arrays.asList(\"one\", \"two\", \"three\", \"four\", \"five\", \"six\", \"seven\", \"eight\", \"nine\", \"ten\"));"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Hack 2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "vscode": {
+     "languageId": "java"
+    }
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "ArrayList: [1, 4, 7, 12, 23]\n"
+     ]
+    }
+   ],
+   "source": [
+    "import java.util.ArrayList;\n",
+    "\n",
+    "public class Hack2 {\n",
+    "    public static void main(Integer[] args) {\n",
+    "        ArrayList<Integer> randomNumbers = new ArrayList<Integer>();\n",
+    "        randomNumbers.add(1);\n",
+    "        randomNumbers.add(4);\n",
+    "        randomNumbers.add(7);\n",
+    "        randomNumbers.add(12);\n",
+    "        randomNumbers.add(23);\n",
+    "        System.out.println(\"ArrayList: \" + randomNumbers);\n",
+    "\n",
+    "        ;\n",
+    "        ;\n",
+    "        ;\n",
+    "    }\n",
+    "}\n",
+    "Hack2.main(null);"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Hack 3"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "vscode": {
+     "languageId": "java"
+    }
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "ArrayList: [1, 4, 7, 12, 23]\n",
+      "Total: 47\n"
+     ]
+    }
+   ],
+   "source": [
+    "public class Hack3 {\n",
+    "    public static void main(String[] args) {\n",
+    "        ArrayList<Integer> values = new ArrayList<Integer>();\n",
+    "        values.add(1);\n",
+    "        values.add(4);\n",
+    "        values.add(7);\n",
+    "        values.add(12);\n",
+    "        values.add(23);\n",
+    "        System.out.println(\"ArrayList: \" + values);\n",
+    "\n",
+    "        int total = 0;\n",
+    "\n",
+    "        for (int i=0; i < values.size(); i++) {\n",
+    "            total += values.get(i);\n",
+    "        }\n",
+    "\n",
+    "        System.out.println(\"Total: \" + total);\n",
+    "    }\n",
+    "}\n",
+    "\n",
+    "Hack3.main(null);"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Hack 4"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "vscode": {
+     "languageId": "java"
+    }
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "11 12 22 25 64 "
+     ]
+    }
+   ],
+   "source": [
+    "public class SelectionSort {\n",
+    "    public static void main(String[] args) {\n",
+    "        int[] arr = {64, 25, 12, 22, 11};\n",
+    "        for (int i = 0; i < arr.length; i++) {\n",
+    "            for (int j = i + 1; j < arr.length; j++) {\n",
+    "                if (arr[j] < arr[i]) {\n",
+    "                    // Swap the elements\n",
+    "                    int temp = arr[i];\n",
+    "                    arr[i] = arr[j];\n",
+    "                    arr[j] = temp;\n",
+    "                }\n",
+    "            }\n",
+    "            System.out.print(arr[i] + \" \");\n",
+    "        }\n",
+    "    }\n",
+    "}\n",
+    "\n",
+    "SelectionSort.main(null);"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Hack 5"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "vscode": {
+     "languageId": "java"
+    }
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Elements with even indexes:\n",
+      "1 3 5 7 9 \n",
+      "Elements with odd indexes:\n",
+      "2 4 6 8 10 \n"
+     ]
+    }
+   ],
+   "source": [
+    "public class ArrayIndexingExample {\n",
+    "    public static void main(String[] args) {\n",
+    "        int[] arr = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };\n",
+    "\n",
+    "        System.out.println(\"Elements with even indexes:\");\n",
+    "        for (int i = 0; i < arr.length; i += 2) {\n",
+    "            System.out.print(arr[i] + \" \");\n",
+    "        }\n",
+    "        System.out.println();\n",
+    "\n",
+    "        System.out.println(\"Elements with odd indexes:\");\n",
+    "        for (int i = 1; i < arr.length; i += 2) {\n",
+    "            System.out.print(arr[i] + \" \");\n",
+    "        }\n",
+    "        System.out.println();\n",
+    "    }\n",
+    "}\n",
+    "ArrayIndexingExample.main(null);"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Hack 7"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "vscode": {
+     "languageId": "java"
+    }
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Sum of diagonal elements: 5\n"
+     ]
+    }
+   ],
+   "source": [
+    "public class Test1 {\n",
+    "    public static void main(String[] args) {\n",
+    "        int[][] array = { {1,2,3},{-1,-2,-3},{4,5,6} };\n",
+    "        int sum = 0;\n",
+    "\n",
+    "        // Iterate over the diagonal of the array\n",
+    "        for (int i = 0; i < array.length; i++) {\n",
+    "            sum += array[i][i];\n",
+    "        }\n",
+    "\n",
+    "        System.out.println(\"Sum of diagonal elements: \" + sum);\n",
+    "    }\n",
+    "}\n",
+    "\n",
+    "Test1.main(null);"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Extra Credit"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "vscode": {
+     "languageId": "java"
+    }
+   },
+   "outputs": [],
+   "source": [
+    "// FRQ Array Lists\n"
+   ]
   }
  ],
  "metadata": {