Time.java

@@ -2,7 +2,7 @@
 public class Time {
 	public static boolean timeCheck(String time) {
 
-		String regex = "([01]\\d|2[0-3]):([0-5]\\d)";
+		String regex = "^(    ?:     [01]  \\d     |             2[0-3]   )    :  [0-5]\\d$";
 		boolean formatRichtig = false;
 
 		if (time == null) {
@@ -18,8 +18,7 @@ public class Time {
 	}
 
 	public static void main(String[] args) {
-		System.out.println(timeCheck("23:56"));
+		System.out.println("23:56 \n abc");
-		System.out.println(timeCheck("00:00"));
 		System.out.println(timeCheck(null));
 	}
 }

Vector.java

@@ -9,15 +9,13 @@ public class Vector {
     }
 
     public static void vectorProduct(int[] vector1, int[] vector2) {
-        if (vector1 == null || vector2 == null){
+
-            System.out.println("Wegen unterschiedlichen Dimensionen ist das Kreuzprodukt nicht erlaubt");
+        if (vector1.length == vector2.length && vector2.length == 3) {
-        }
-        else if (vector1.length == vector2.length && vector2.length == 3) {
             int[] kreuzVektor3D = new int[3];
             kreuzVektor3D[0] = (vector1[1] * vector2[2]) - (vector1[2] * vector2[1]);
             kreuzVektor3D[1] = (vector1[2] * vector2[0]) - (vector1[0] * vector2[2]);
             kreuzVektor3D[2] = (vector1[0] * vector2[1]) - (vector1[1] * vector2[0]);
-            System.out.println("Ergebnis des 3DKreuzproduktes: [" + kreuzVektor3D[0] + ", " + kreuzVektor3D[1] + ", "
+            System.out.println("Ergebnis des Kreuzproduktes: [" + kreuzVektor3D[0] + ", " + kreuzVektor3D[1] + ", "
                     + kreuzVektor3D[2] + "]");
 
         }
@@ -25,7 +23,7 @@ public class Vector {
         else if (vector1.length == vector2.length && vector2.length == 2) {
             int kreuzVektor2D = 0;
             kreuzVektor2D = (vector1[0] * vector2[1]) - (vector1[1] * vector2[0]);
-            System.out.println("Ergebnis des 2DKreuzproduktes: " + kreuzVektor2D);
+            System.out.println("Ergebnis des Kreuzproduktes: " + kreuzVektor2D);
 
         }
 

VectorTest.java

@@ -5,6 +5,78 @@ import static org.junit.jupiter.api.Assertions.*;
 
 public class VectorTest {
 
+    @Test
+    void testScalarMultiplication() {
+        int[] vector = {1, 2, 3};
+        int scalar = 2;
+        Vector.scalarMultiplication(vector, scalar);
+        assertArrayEquals(new int[]{2, 4, 6}, vector);
+        int[] vector1 = {7, 8, 15};
+
+        Vector.scalarMultiplication(vector1, -1);
+        assertArrayEquals(new int[]{-7, -8, -15}, vector1);
+    }
+
+    @Test
+    void testVectorProduct2D() {
+        int[] vector1 = {3, 4};
+        int[] vector2 = {5, 6};
+        // Für 2D Kreuzprodukt wird der Skalarwert (Z-Komponente des 3D-Kreuzprodukts) verwendet
+        // 3*6 - 4*5 = 18 - 20 = -2
+        // Erwartete Ausgabe: -2
+        System.out.print("Erwartete Ausgabe: -2\nTatsächliche Ausgabe: ");
+        Vector.vectorProduct(vector1, vector2);
+    }
+
+    @Test
+    void testVectorProduct3D() {
+        int[] vector1 = {1, 2, 3};
+        int[] vector2 = {4, 5, 6};
+        // Kreuzprodukt:
+        // x = 2*6 - 3*5 = 12 - 15 = -3
+        // y = 3*4 - 1*6 = 12 - 6 = 6
+        // z = 1*5 - 2*4 = 5 - 8 = -3
+        System.out.print("Erwartete Ausgabe: [-3, 6, -3]\nTatsächliche Ausgabe: ");
+        Vector.vectorProduct(vector1, vector2);
+    }
+
+    @Test
+    void testVectorLength() {
+        int[] vector = {3, 4};
+        double length = Vector.vectorLength(vector);
+        assertEquals(5.0, length, 0.001);
+
+        int[] vector3D = {1, 2, 2};
+        assertEquals(3.0, Vector.vectorLength(vector3D), 0.001);
+    }
+
+    @Test
+    void testMatrixMultiplicationValidMatrix() {
+        int[][] matrix = {
+            {1, 2, 3},
+            {4, 5, 6},
+            {7, 8, 9}
+        };
+        int scalar = 2;
+        int[][] expected = {
+            {2, 4, 6},
+            {8, 10, 12},
+            {14, 16, 18}
+        };
+        assertArrayEquals(expected, Vector.matrixMultiplication(matrix, scalar));
+    }
+
+    @Test
+    void testMatrixMultiplicationInvalidMatrix() {
+        int[][] invalidMatrix = {
+            {1, 2},
+            {3, 4}
+        };
+        assertNull(Vector.matrixMultiplication(invalidMatrix, 3));
+    }
+
+
+
     @Test
     void testScalarMultiplicationVariants() {
         int[] v1 = {1, 2, 3};