Add 3 3 (ArrayList vs LinkedList)

README.md

@@ -10,6 +10,7 @@
 <br>Sowohl SourceCode, PDF als auch Word Datei
 - VL 2 Aufgabe 1 (Erstellen von Testdaten)
 - VL 2 Aufgabe 2 (StringTokenizer)
+- VL 3 Aufgabe 3 (ArrayList vs LinkedList)
 
 
 - keine

src/part3/aufg3/Anwendung.java

@@ -1,5 +1,8 @@
 package part3.aufg3;
 
+import java.util.ArrayList;
+import java.util.LinkedList;
+
 /**
  * Aufgabe 3
  * Es soll die Einfügeperformance der beiden Klassen LinkedList und ArrayList verglichen
@@ -23,24 +26,76 @@ package part3.aufg3;
 
 public class Anwendung {
 
-    private String getRandomString(){
+    public static String getRandomString(int MIN_LENGTH, int MAX_LENGTH) {
         char[] alphabet = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
         int size;
 
-        do{
-            size = (int) Math.random()*16;
-        }while (size<10);
+        do {
+            size = (int) (Math.random() * MAX_LENGTH);
+        } while (size < MIN_LENGTH);
 
         String output = "";
         int index;
 
-        for (int i=0; i<size; i++){
-            index = (int) Math.random()*alphabet.length;
+        for (int i = 0; i < size; i++) {
+            index = (int) (Math.random() * alphabet.length);
             output += alphabet[index];
         }
         return output;
     }
-    public static void main(String[] args){
 
+    public static void fillWithRandomStrings(LinkedList<String> ls, int amount) {
+        for (int i = 0; i < amount; i++) {
+            ls.add(getRandomString(10, 16));
+        }
+    }
+
+    public static void fillWithRandomStrings(ArrayList<String> ls, int amount){
+        for (int i=0; i<amount; i++){
+            ls.add(getRandomString(10,16));
+        }
+    }
+
+    public static void main(String[] args) {
+
+        int stringsToAdd = 50_000_000;
+        long totalTimeSpent = 0;
+        int measurements = 10;
+
+        for (int i = 0; i < measurements; i++) {
+
+            long timeStart = System.currentTimeMillis();
+
+            // LinkedList<String> ls = new LinkedList<>();
+            ArrayList<String> ls = new ArrayList<>();
+
+            fillWithRandomStrings(ls, stringsToAdd);
+
+            long timeEnd = System.currentTimeMillis();
+            long timeSpent = timeEnd-timeStart;
+            totalTimeSpent += timeSpent;
+
+            System.out.println(timeSpent);
+        }
+        System.out.println("Average of " + measurements + ": " + (totalTimeSpent/measurements));
     }
 }
+
+/*
+    Linked List:                        ArrayLis:
+    10k     10  single Time of 0 ???    7
+    20k     9   Here too ??             11
+    50k     24                          22
+
+    100k    47                          37
+    200k    99                          74
+    500k    245                         188
+
+    1Mil    737                         350
+    2Mil    1576                        688
+    5Mil    4173                        1650
+
+    10Mil   8600                        3300
+    20Mil   17750                       6690
+    50Mil   43600                       24860
+ */