app/src/main/java/school_project/Utils/Array.java

@@ -0,0 +1,13 @@
+package school_project.Utils;
+
+import java.util.Arrays;
+
+public class Array{
+    public static boolean[][] MatrixCopyOf(boolean[][] o){
+        boolean[][] ret =  new boolean[o.length][];
+        for (int i = 0; i < o.length; i++){
+            ret[i] = Arrays.copyOf(o[i], o[i].length);
+        }
+        return ret;
+    }
+}

app/src/test/java/school_project/Utils/ArrayTest.java

@@ -0,0 +1,26 @@
+package school_project.Utils;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ArrayTest {
+
+    @Test
+    void matrixCopyOf() {
+        boolean[][] a = new boolean[][] {
+                {true, false, true},
+                {false, false, false},
+                {true, false, true},
+        };
+        boolean[][] b = new boolean[][] {
+                {true, false, true},
+                {false, false, false},
+                {true, false, true},
+        };
+        boolean[][] c = Array.MatrixCopyOf(a);
+        assertArrayEquals(a, c);
+        a[1][1] = true;
+        assertArrayEquals(b, c);
+    }
+}