Uebungsaufgaben/Semester2/Vorlesung2part3.java

package Semester2;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.Random;

public class Vorlesung2part3 {

    public static void main(String[] args) {
        LinkedList<String> linkedList = new LinkedList<>();
        ArrayList<String> arrayList = new ArrayList<>();

        int[] anzahl = {10000, 20000, 50000, 100000, 200000, 500000,
            1000000, 2000000, 5000000, 10000000, 20000000, 50000000};


        for (int i: anzahl) {
            long timeStartLinked = System.currentTimeMillis();
            for (int j = 0; j < i; j++) {
                linkedList.add(generiereZeichenkette());
            }
            long timeEndLinked = System.currentTimeMillis();
            long elapsedTimeLinked = timeEndLinked - timeStartLinked;
            System.out.println("Linked List time for " + i + " Data: " + elapsedTimeLinked);

            long timeStartArray = System.currentTimeMillis();
            for (int j = 0; j < i; j++) {
                arrayList.add(generiereZeichenkette());
            }
            long timeEndArray = System.currentTimeMillis();
            long elapsedTimeArray = timeEndArray - timeStartArray;
            System.out.println("Array List time for " + i + " Data: " + elapsedTimeArray);
            System.out.println("\n");

            linkedList.clear();
            arrayList.clear();
        }
    }

    private static String generiereZeichenkette() {
        Random random = new Random();
        String wort = "";
        for (int i = 0; i < random.nextInt(15, 20); i++) {
            wort += (char) random.nextInt(65, 122);
        }
        return wort;
    }
}