From f63261a4324a535b088eabbe791ef0a402545de6 Mon Sep 17 00:00:00 2001
From: amin <amin@MacBook-Pro-de-amin.local>
Date: Thu, 27 Jun 2024 04:26:32 +0100
Subject: [PATCH] docs: adding subject and main

---
 .../maximal-square/ExerciseRunner.java        | 27 +++++++++
 .../java/checkpoints/maximal-square/README.md | 60 +++++++++++++++++++
 2 files changed, 87 insertions(+)
 create mode 100644 subjects/java/checkpoints/maximal-square/ExerciseRunner.java
 create mode 100644 subjects/java/checkpoints/maximal-square/README.md

diff --git a/subjects/java/checkpoints/maximal-square/ExerciseRunner.java b/subjects/java/checkpoints/maximal-square/ExerciseRunner.java
new file mode 100644
index 000000000..821bad8d5
--- /dev/null
+++ b/subjects/java/checkpoints/maximal-square/ExerciseRunner.java
@@ -0,0 +1,27 @@
+public class ExerciseRunner {
+    public static void main(String[] args) {
+        MaximalSquare finder = new MaximalSquare();
+
+        // Test case 1
+        char[][] matrix1 = {
+            {'1', '0', '1', '0', '0'},
+            {'1', '0', '1', '1', '1'},
+            {'1', '1', '1', '1', '1'},
+            {'1', '0', '0', '1', '0'}
+        };
+        System.out.println("Maximal square area: " + finder.maximalSquare(matrix1)); // Expected output: 4
+
+        // Test case 2
+        char[][] matrix2 = {
+            {'0', '1'},
+            {'1', '0'}
+        };
+        System.out.println("Maximal square area: " + finder.maximalSquare(matrix2)); // Expected output: 1
+
+        // Test case 3
+        char[][] matrix3 = {
+            {'0'}
+        };
+        System.out.println("Maximal square area: " + finder.maximalSquare(matrix3)); // Expected output: 0
+    }
+}
\ No newline at end of file
diff --git a/subjects/java/checkpoints/maximal-square/README.md b/subjects/java/checkpoints/maximal-square/README.md
new file mode 100644
index 000000000..f25bca4b9
--- /dev/null
+++ b/subjects/java/checkpoints/maximal-square/README.md
@@ -0,0 +1,60 @@
+## Maximal Square
+
+### Instructions
+
+Create a class `MaximalSquare` that provides a method to find the area of the largest square containing only 1's in a given 2D binary matrix.
+
+### Expected Class
+
+```java
+public class MaximalSquare {
+    public int maximalSquare(char[][] matrix) {
+        // Implementation to find the area of the largest square containing only 1's
+    }
+}
+```
+
+### Usage
+
+Here is a possible `ExerciseRunner.java` to test your class:
+
+```java
+public class ExerciseRunner {
+    public static void main(String[] args) {
+        MaximalSquare finder = new MaximalSquare();
+
+        // Test case 1
+        char[][] matrix1 = {
+            {'1', '0', '1', '0', '0'},
+            {'1', '0', '1', '1', '1'},
+            {'1', '1', '1', '1', '1'},
+            {'1', '0', '0', '1', '0'}
+        };
+        System.out.println("Maximal square area: " + finder.maximalSquare(matrix1)); // Expected output: 4
+
+        // Test case 2
+        char[][] matrix2 = {
+            {'0', '1'},
+            {'1', '0'}
+        };
+        System.out.println("Maximal square area: " + finder.maximalSquare(matrix2)); // Expected output: 1
+
+        // Test case 3
+        char[][] matrix3 = {
+            {'0'}
+        };
+        System.out.println("Maximal square area: " + finder.maximalSquare(matrix3)); // Expected output: 0
+    }
+}
+```
+
+### Expected Output
+
+```shell
+$ javac *.java -d build
+$ java -cp build ExerciseRunner
+Maximal square area: 4
+Maximal square area: 1
+Maximal square area: 0
+$
+```
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