Updated examples

src/main/java/pr2/algorithmen/sorting/BubbleSort.java

@@ -1,5 +1,7 @@
 package pr2.algorithmen.sorting;
 
+import pr2.algorithmen.sort.Sorter;
+
 public class BubbleSort implements Sorter {
 
     @Override

src/main/java/pr2/algorithmen/sorting/InsertionSort.java

@@ -1,5 +1,7 @@
 package pr2.algorithmen.sorting;
 
+import pr2.algorithmen.sort.Sorter;
+
 public class InsertionSort implements Sorter {
 
     @Override

src/main/java/pr2/algorithmen/sorting/MergeSort.java

@@ -1,9 +1,11 @@
 package pr2.algorithmen.sorting;
 
+import pr2.algorithmen.sort.Sorter;
+
 public class MergeSort implements Sorter {
 
     void msort(int[] array, int le, int ri, int[] helper) {
-        int i, j, k;
+        int i, j;
         if (ri > le) {
             // zu sortierendes Feld teilen
             int mid = (ri + le) / 2;
@@ -13,17 +15,17 @@ public class MergeSort implements Sorter {
             msort(array, mid + 1, ri, helper);
 
             // Hilfsfeld aufbauen
-            for (k = le; k <= mid; k++) {
+            for (int k = le; k <= mid; k++) {
                 helper[k] = array[k];
             }
 
-            for (k = mid; k < ri; k++) {
+            for (int k = mid; k < ri; k++) {
                 helper[ri + mid - k] = array[k + 1];
             }
 
             // Ergebnisse mischen über Hilfsfeld
             i = le; j = ri;
-            for (k = le; k <= ri; k++) {
+            for (int k = le; k <= ri; k++) {
                 if (helper[i] < helper[j]) {
                     array[k] = helper[i++];
                 } else {

src/main/java/pr2/algorithmen/sorting/QuickSort.java

@@ -1,5 +1,7 @@
 package pr2.algorithmen.sorting;
 
+import pr2.algorithmen.sort.Sorter;
+
 public class QuickSort implements Sorter {
 
     int partition(int[] array, int u, int o, int p) {

src/main/java/pr2/algorithmen/sorting/SelectionSort.java

@@ -1,21 +1,23 @@
 package pr2.algorithmen.sorting;
 
+import pr2.algorithmen.sort.Sorter;
+
 public class SelectionSort implements Sorter {
 
     @Override
     public void sort(int[] data) {
-        int marker = data.length - 1;
-        while (marker >= 0) {
+        int pos = data.length - 1;
+        while (pos >= 0) {
             // bestimme größtes Element
-            int max = 0;
-            for (int i = 1; i <= marker; i++) {
-                if (data[i] > data[max]) {
-                    max = i;
+            int indexMax = 0;
+            for (int i = 0; i <= pos; i++) {
+                if (data[i] > data[indexMax]) {
+                    indexMax = i;
                 }
             }
-            // tausche array[marker] mit diesem Element
-            swap(data, marker, max);
-            marker--;
+            // tausche array[pos] mit diesem Element
+            swap(data, pos, indexMax);
+            pos--;
         }
     }
 

src/main/java/pr2/algorithmen/sorting/Sorter.java

@@ -5,6 +5,10 @@ public interface Sorter {
     void sort(int[] data);
 
     default void swap(int[] data, int i1, int i2) {
+        if (i1 == i2) {
+            return;
+        }
+
         int tmp = data[i1];
         data[i1] = data[i2];
         data[i2] = tmp;

src/main/java/pr2/algorithmen/sorting/TestSorting.java

@@ -1,5 +1,12 @@
 package pr2.algorithmen.sorting;
 
+import pr2.algorithmen.sort.impl.BubbleSort;
+import pr2.algorithmen.sort.impl.InsertionSort;
+import pr2.algorithmen.sort.impl.MergeSort;
+import pr2.algorithmen.sort.impl.QuickSort;
+import pr2.algorithmen.sort.impl.SelectionSort;
+import pr2.algorithmen.sort.Sorter;
+
 import java.util.*;
 
 public class TestSorting {
@@ -15,9 +22,9 @@ public class TestSorting {
         }
     }
 
-    static long testAlgorithm(Class clazz, int size, int runs) {
+    static long testAlgorithm(Class<?> clazz, int size, int runs) {
 
-        Sorter s;
+        pr2.algorithmen.sort.Sorter s;
 
         var data = new int[size];
         for (int i = 0; i < data.length; i++) {
@@ -40,15 +47,13 @@ public class TestSorting {
         }
 
 
-        long runtime = System.nanoTime() - start;
-
-        return runtime;
+        return System.nanoTime() - start;
 
     }
 
-    public static void measure(int size_steps, int max_size, int runs) {
+    public static void measure(int sizeSteps, int maxSize, int runs) {
         System.out.println("Runs\tBS\tIS\tMS\tQS\tSS");
-        for (int size = 0; size <= max_size; size += size_steps) {
+        for (int size = 0; size <= maxSize; size += sizeSteps) {
             long bs = testAlgorithm(BubbleSort.class, size, runs);
             long is = testAlgorithm(InsertionSort.class, size, runs);
             long ms = testAlgorithm(MergeSort.class, size, runs);
@@ -58,7 +63,6 @@ public class TestSorting {
         }
     }
     public static void main(String[] args) {
-
         measure(10, 1000, 100);
 
         final int size = 1000;

src/main/java/pr2/exceptions/callstack/HandleOrDeclare.java

@@ -1,4 +1,3 @@
-
 package pr2.exceptions.callstack;
 
 import java.io.FileNotFoundException;
@@ -11,26 +10,23 @@ import java.sql.SQLException;
 public class HandleOrDeclare {
 
     public void openFile(String dateiName)
-            throws IOException, FileNotFoundException {
+        throws IOException, FileNotFoundException {
         // Datei öffnen
     }
 
     public void datenSchreiben(String dateiName, String sqlStatement)
-            throws FileNotFoundException, IOException, SQLException {
-
+        throws FileNotFoundException, IOException, SQLException {
         openFile(dateiName);
         // Mit Datenbank arbeiten
     }
 
     public void dateiAnlegen(String dateiName)
-            throws FileNotFoundException, IOException {
-
+        throws FileNotFoundException, IOException {
         try {
             datenSchreiben(dateiName, "SELECT * FROM x");
-        }
-        catch (SQLException ex) {
+        } catch (SQLException ex) {
             // Datenbank Problem beheben ;-)
-         }
+        }
     }
 
     public void userInterface() {
@@ -38,12 +34,10 @@ public class HandleOrDeclare {
 
         try {
             dateiAnlegen(dateiName);
-        }
-        catch (FileNotFoundException ex) {
-            // Benutzer erneut nach namen Fragen
-        }
-        catch (IOException ex) {
-            // Benutzer auf Problem hinweisen
+        } catch (FileNotFoundException ex) {
+            // Benutzer:in erneut nach namen Fragen
+        } catch (IOException ex) {
+            // Benutzer:in auf Problem hinweisen
         }
     }
 

src/main/java/pr2/exceptions/junit/BrokenTest.java

@@ -3,13 +3,13 @@
  */
 package pr2.exceptions.junit;
 
-import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Disabled;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import org.junit.jupiter.api.Assertions;
 
 public class BrokenTest {
 
-    @Test
+    @Disabled
     public void testKaputt() {
         String s1 = new String("Hallo");
         assertEquals("Hallo", s1);