Java拷贝一个集合数组

@Test
    public void test13() {
        List<Integer> l1 = Lists.newArrayList();
        l1.add(1);
        l1.add(2);
        l1.add(3);
        ArrayList<Integer> l2 = Lists.newArrayList(l1);
        l2.remove(1);
        System.out.println(l1);
        System.out.println(l2);
        System.out.println(l1==l2);
        //System.out.println(l2);
    }