过时的引用和内存不足错误

Question

为什么version4方法抛出内存错误，但version3方法不抛出它，我认为在这两种情况下都存在问题是“过时参考”？

private static void version4() {
    int count = 0;
    long start = System.nanoTime();
    try {
        List<Calendar> list = new ArrayList<>();
        System.out.println(list.size());
        while(true){
            for (int i = 0; i < 1000; i++) {
                Calendar calendar = Calendar.getInstance();
                list.add(i, calendar);
            }
        }
    } catch (Error e) {
        e.printStackTrace();
    }
    long end = System.nanoTime();
    System.out.println("count: " + count + " | time:" + (end - start)/1000000);
}

private static void version3() {
    int count = 0;
    long start = System.nanoTime();
    try {
        Calendar[] calendars = new Calendar[1000]; 
        while(true){
            for (int i = 0; i < calendars.length; i++) {
                Calendar calendar = Calendar.getInstance();
                calendars[i] = calendar;
            }
        }
    } catch (Error e) {
        e.printStackTrace();
    }
    long end = System.nanoTime();
    System.out.println("count: " + count + " | time:" + (end - start)/1000000);
}