diff --git a/java2.iml b/java2.iml
deleted file mode 100644
index 49d60fe..0000000
--- a/java2.iml
+++ /dev/null
@@ -1,19 +0,0 @@
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index 822f615..b67b0f9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -55,11 +55,11 @@
test
- org.junit.jupiter
- junit-jupiter-engine
- 5.1.0
- test
-
+ org.junit.jupiter
+ junit-jupiter-engine
+ 5.1.0
+ test
+
org.junit.vintage
junit-vintage-engine
diff --git a/src/main/java/de/joethei/hs/java2/praktikum1/GrosseZahl.java b/src/main/java/de/joethei/hs/java2/praktikum/praktikum1/GrosseZahl.java
similarity index 99%
rename from src/main/java/de/joethei/hs/java2/praktikum1/GrosseZahl.java
rename to src/main/java/de/joethei/hs/java2/praktikum/praktikum1/GrosseZahl.java
index eb6402d..defaa3e 100644
--- a/src/main/java/de/joethei/hs/java2/praktikum1/GrosseZahl.java
+++ b/src/main/java/de/joethei/hs/java2/praktikum/praktikum1/GrosseZahl.java
@@ -1,4 +1,4 @@
-package de.joethei.hs.java2.praktikum1;
+package de.joethei.hs.java2.praktikum.praktikum1;
public class GrosseZahl {
diff --git a/src/main/java/de/joethei/hs/java2/vorlesungen/Sieb.java b/src/main/java/de/joethei/hs/java2/vorlesungen/Sieb.java
new file mode 100644
index 0000000..34554f5
--- /dev/null
+++ b/src/main/java/de/joethei/hs/java2/vorlesungen/Sieb.java
@@ -0,0 +1,38 @@
+package de.joethei.hs.java2.vorlesungen;
+
+import java.util.Set;
+import java.util.TreeSet;
+
+public class Sieb {
+ private int n;
+
+ public Sieb(int n) {
+ this.n = n;
+ }
+
+ public Set getPrimzahl() {
+ Set set = new TreeSet<>();
+ for(int i = 2; i <= n; i++) {
+ set.add(i);
+ }
+ Set not = new TreeSet<>();
+ int mult;
+ int number = 2;
+ do{
+ mult = 2*number;
+ while (mult <= n) {
+ not.add(mult);
+ mult += number;
+ }
+ do {
+ number++;
+ }
+ while (not.contains(number));
+ }while (number * number <= n);
+ set.removeAll(not);
+
+ return set;
+ }
+
+
+}
\ No newline at end of file
diff --git a/src/test/java/de/joethei/hs/java2/tests/GrosseZahlTest.java b/src/test/java/de/joethei/hs/java2/tests/GrosseZahlTest.java
index cfff205..feca862 100644
--- a/src/test/java/de/joethei/hs/java2/tests/GrosseZahlTest.java
+++ b/src/test/java/de/joethei/hs/java2/tests/GrosseZahlTest.java
@@ -1,11 +1,12 @@
package de.joethei.hs.java2.tests;
-import de.joethei.hs.java2.praktikum1.GrosseZahl;
+import de.joethei.hs.java2.praktikum.praktikum1.GrosseZahl;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
+@DisplayName("Eigene GrosseZahl")
class GrosseZahlTest {
@Test
diff --git a/src/test/java/de/joethei/hs/java2/tests/GrosseZahlTest2.java b/src/test/java/de/joethei/hs/java2/tests/GrosseZahlTest2.java
index 44c1a76..4f02d4c 100644
--- a/src/test/java/de/joethei/hs/java2/tests/GrosseZahlTest2.java
+++ b/src/test/java/de/joethei/hs/java2/tests/GrosseZahlTest2.java
@@ -1,11 +1,12 @@
package de.joethei.hs.java2.tests;
-import static org.junit.Assert.*;
-
-import de.joethei.hs.java2.praktikum1.GrosseZahl;
+import de.joethei.hs.java2.praktikum.praktikum1.GrosseZahl;
import org.junit.Before;
import org.junit.Test;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
public class GrosseZahlTest2 {
GrosseZahl i0;
diff --git a/src/test/java/de/joethei/hs/java2/tests/VorlesungsTest.java b/src/test/java/de/joethei/hs/java2/tests/VorlesungsTest.java
new file mode 100644
index 0000000..2ead880
--- /dev/null
+++ b/src/test/java/de/joethei/hs/java2/tests/VorlesungsTest.java
@@ -0,0 +1,19 @@
+package de.joethei.hs.java2.tests;
+
+import de.joethei.hs.java2.vorlesungen.Sieb;
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.Set;
+import java.util.TreeSet;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class VorlesungsTest {
+
+ @Test
+ void sieb() {
+ Set set = new TreeSet<>(Arrays.asList(2, 3, 5, 7, 11, 13, 17, 19));
+ assertEquals(set, new Sieb(20).getPrimzahl());
+ }
+}
\ No newline at end of file