solved s12 ex1

12/src/main/java/ch/zhaw/ads/QuickerSortServer.java

@@ -0,0 +1,71 @@
+package ch.zhaw.ads;
+
+import java.util.Random;
+
+public class QuickerSortServer implements CommandExecutor {
+
+    @Override
+    public String execute(String command) {
+        int[] testdata = new int[1000];
+        Random random = new Random();
+        for (int i=0; i < testdata.length; i++) {
+            testdata[i] = random.nextInt(1000000);
+        }
+        quickSort(testdata);
+        return "Is sorted: " + checkSorted(testdata);
+    }
+
+    private void quickSort(int[] a, int left, int right) {
+        if (left < right) {
+            int mid = partition (a, left, right);
+            if (mid <= 50) {
+                insertSort(a);
+            } else {
+                quickSort(a, left, mid-1);
+                quickSort(a, mid , right);
+            }
+        }
+    }
+
+    private void quickSort(int[] a){
+        quickSort(a, 0, a.length-1);
+    }
+
+    private static int partition (int[] a, int left, int right) {
+        int pivot = a[(left + right) / 2];
+        while (left <= right) {
+            while (a[left] < pivot) {
+                left++;
+            }
+            while (a[right] > pivot) {
+                right--;
+            }
+            if (left <= right) {
+                int temp = a[left];
+                a[left] = a[right];
+                a[right] = temp;
+                left++;
+                right--;
+            }
+        }
+        return left;
+    }
+
+    private boolean checkSorted(int[] a) {
+        for (int i=1; i < a.length; i++) {
+            if (a[i-1] > a[i]) return false;
+        }
+        return true;
+    }
+
+    private void insertSort(int[] a) {
+        for (int k = 1; k < a.length; k++)
+            if (a[k] < a[k-1]){
+                int x = a[k];
+                int i;
+                for (i = k; ((i > 0) && (a[i-1] > x));i--)
+                    a[i] = a[i-1];
+                a[i] = x;
+            }
+    }
+}

12/src/test/java/ch/zhaw/ads/QuickerSortServerTest.java

@@ -0,0 +1,19 @@
+package ch.zhaw.ads;
+
+import org.junit.Test;
+import org.junit.Before;
+import static org.junit.Assert.*;
+import java.util.*;
+import java.io.*;
+
+public class QuickerSortServerTest {
+
+    QuickerSortServer serverToTest;
+
+    @Test
+    public void test1() {
+        serverToTest = new QuickerSortServer();
+        System.out.println(serverToTest.execute(""));
+    }
+}
+