public static void main(String[] args) {

    //第一种赋值

    List<String> list1 = Arrays.asList("string1","string2","string3");

    //第二种赋值

    List<String> list2 = new ArrayList<>();

    list2.add("string4");

    list2.add("string5");

    list2.add("string6");

    //第三种赋值

    list2.addAll(list1);

    //第四种赋值

    List<String> list3 = new ArrayList<>();

    Collections.addAll(list3, "string7","string8","string9");

    //第五种赋值

    List<String> list4 = new ArrayList<String>(){{

        add("string10");

        add("string11");

        add("string12");

        //第六种赋值

        addAll(list1);

    }};

    System.out.println(list1);

    System.out.println(list2);

    System.out.println(list3);

    System.out.println(list4);

}

/*output

[string1, string2, string3]

[string4, string5, string6, string1, string2, string3]

[string7, string8, string9]

[string10, string11, string12, string1, string2, string3]

*/