diff --git a/Matrici/Identita.java b/Matrici/Identita.java
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--- /dev/null
+++ b/Matrici/Identita.java
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+public class Identita {
+    public static void main(String[] args) {
+        int[][] matrice =
+            {
+                {1, 0, 0, 0, 0},
+                {0, 1, 0, 0, 0},
+                {0, 0, 1, 0, 0},
+                {0, 0, 0, 1, 0},
+                {0, 0, 0, 0, 1}
+            };
+
+        System.out.println(cercaIdentita(matrice));
+
+    }
+
+    private static boolean cercaIdentita(int[][] matrice) {
+        for (int i = 0; i < matrice.length; i++) {
+            for (int j = 0; j < matrice[0].length; j++) {
+                if(matrice[i][i] != 1) {
+                    return false;
+                }
+                if(i != j && matrice[i][j] != 0) {
+                    return false;
+                }
+            }
+        }
+
+        return true;
+    }
+}
diff --git a/Matrici/Identita.pdf b/Matrici/Identita.pdf
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diff --git a/Matrici/Riempimento.java b/Matrici/Riempimento.java
new file mode 100644
index 0000000..14e596a
--- /dev/null
+++ b/Matrici/Riempimento.java
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+import java.util.Random;
+
+public class Riempimento {
+    public static void main(String[] args) {
+        int[][] matrice = new int[5][5];
+
+        riempiRandom(matrice, 100);
+
+        for (int[] array : matrice) {
+            for(int num : array) {
+                System.out.printf("%2d ", num);
+            }
+            System.out.println();
+        }
+    }
+
+    public static void riempiRandom(int[][] matrice, int maxValue) {
+        Random generator = new Random();
+
+        for (int i = 0; i < matrice.length; i++) {
+            for (int j = 0; j < matrice[0].length; j++) {
+                matrice[i][j] = generator.nextInt(maxValue);
+            }
+        }
+    }
+}
diff --git a/Matrici/Riempimento.pdf b/Matrici/Riempimento.pdf
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diff --git a/Matrici/Simmetria.java b/Matrici/Simmetria.java
new file mode 100644
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+++ b/Matrici/Simmetria.java
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+public class Simmetria {
+    public static void main(String[] args) {
+        int[][] matrice =
+        {
+            {1, 2, 3, 4, 5},
+            {2, 1, 4, 5, 6},
+            {3, 4, 1, 6, 7},
+            {4, 5, 6, 1, 8},
+            {5, 6, 7, 8, 1}
+        };
+
+        for (int[] array : matrice) {
+            for(int num : array) {
+                System.out.printf("%2d ", num);
+            }
+            System.out.println();
+        }
+
+        boolean simmetrico = true;
+        for (int i = 0; i < matrice.length; i++) {
+            for (int j = 0; j < matrice[0].length; j++) {
+                if (matrice[i][j] != matrice[j][i]) simmetrico = false;
+            }
+        }
+
+        if(simmetrico) {
+            System.out.println("La matrice è simmetrica rispetto alla diagonale principale");
+        } else {
+            System.out.println("La matrice non è simmetrica");
+        }
+    }
+}
diff --git a/Matrici/Simmetria.pdf b/Matrici/Simmetria.pdf
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