java ArrayList LinkedList 비교

비교

        ArrayList<Integer> arrayList = new ArrayList<>();
        LinkedList<Integer> linkedList = new LinkedList<>();

        System.out.println("뒤에 추가");
        int count1 = 10_000_000;
        listAdd(arrayList, count1);
        listAdd(linkedList, count1);
        
        System.out.println("앞부터 삭제");
        int count4 = 1_000;
        listRemoveHead(arrayList, count4);
        listRemoveHead(linkedList, count4);
    }

뒤에 추가
0.194 sec
0.896 sec
앞부터 삭제
5.199 sec
0.0 sec

        System.out.println("뒤에 추가");
        int count1 = 10_000_000;
        listAdd(arrayList, count1);
        listAdd(linkedList, count1);
        
        System.out.println("중간 추가");
        int count2 = 5_000;
        listAddMiddle(arrayList, count2);
        listAddMiddle(linkedList, count2);
        
        System.out.println("앞부터 삭제");
        int count4 = 1_000;
        listRemoveHead(arrayList, count4);
        listRemoveHead(linkedList, count4);

뒤에 추가
0.19 sec
0.899 sec
중간 추가
27.783 sec
0.006 sec
앞부터 삭제
5.871 sec
0.0 sec

        System.out.println("뒤에 추가");
        int count1 = 10_000_000;
        listAdd(arrayList, count1);
        listAdd(linkedList, count1);
        
        System.out.println("뒤부터 삭제");
        int count3 = 5_000_000;
        listRemoveBack(arrayList, count3);
        listRemoveBack(linkedList, count3);
        
        System.out.println("앞부터 삭제");
        int count4 = 1_000;
        listRemoveHead(arrayList, count4);
        listRemoveHead(linkedList, count4);

뒤에 추가
0.2 sec
0.89 sec
뒤부터 삭제
0.393 sec
0.053 sec
앞부터 삭제
1.8 sec
0.0 sec

        System.out.println("뒤에 추가");
        int count1 = 10_000_000;
        listAdd(arrayList, count1);
        listAdd(linkedList, count1);
        
        System.out.println("중간 삭제");
        int count5 = 1_000;
        listRemoveMiddle(arrayList, count5);
        listRemoveMiddle(linkedList, count5);

뒤에 추가
0.196 sec
0.907 sec
중간 삭제
4.772 sec
4.526 sec

        System.out.println("뒤에 추가");
        int count1 = 10_000_000;
        listAdd(arrayList, count1);
        listAdd(linkedList, count1);
        
        System.out.println("앞부터 조회");
        int count6 = 100_000;
        listGetHead(arrayList, count6);
        listGetHead(linkedList, count6);

뒤에 추가
0.193 sec
0.924 sec
앞부터 조회
0.004 sec
9.245 sec

    private static void listAdd(List<Integer> list, Integer count) {
        long start = System.currentTimeMillis();
        for (int i = 0; i < count; i++) {
            list.add(i);
        }
        System.out.println((System.currentTimeMillis() - start) / 1000f + " sec");
    }
    
    private static void listAddMiddle(List<Integer> list, Integer count) {
        long start = System.currentTimeMillis();
        for (int i = 0; i < count; i++) {
            list.add(500, i);
        }
        System.out.println((System.currentTimeMillis() - start) / 1000f + " sec");
    }
    
    private static void listRemoveBack(List<Integer> list, Integer count) {
        long start = System.currentTimeMillis();
        for (int i = list.size() - 1; count > 0; i--, count--) {
            list.remove(i);
        }
        System.out.println((System.currentTimeMillis() - start) / 1000f + " sec");
    }
    
    private static void listRemoveMiddle(List<Integer> list, Integer count) {
        long start = System.currentTimeMillis();
        for (int i = 0; i < count; i++) {
            list.remove(1_000_000);
        }
        System.out.println((System.currentTimeMillis() - start) / 1000f + " sec");
    }
    
    private static void listRemoveHead(LinkedList<Integer> list, Integer count) {
        long start = System.currentTimeMillis();
        for (int i = 0; i < count; i++) {
            list.remove();
        }
        System.out.println((System.currentTimeMillis() - start) / 1000f + " sec");
    }
    
    private static void listRemoveHead(ArrayList<Integer> list, Integer count) {
        long start = System.currentTimeMillis();
        for (int i = 0; i < count; i++) {
            list.remove(0);
        }
        System.out.println((System.currentTimeMillis() - start) / 1000f + " sec");
    }
    
    private static void listGetHead(List<Integer> list, Integer count) {
        long start = System.currentTimeMillis();
        int sum = 0;
        for (int i = 0; i < count; i++) {
            sum += list.get(i);
        }
        System.out.println((System.currentTimeMillis() - start) / 1000f + " sec");
    }