Method for List initialization

Method for List initialization

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1. Conventional method

        List<String> list = new ArrayList<>();
        list.add("1");
        list.add("2");
        list.add("3");
        System.out.println("getList: " + list); // getList: [1, 2, 3]

Output result:

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2. Arrays tool class

        List<String> list = Arrays.asList("1", "2", "3");
        System.out.println("getList: " + list); // getList: [1, 2, 3]

Output result:

The source code of the Arrays.asList(T… a) method is as follows:

    @SafeVarargs
    @SuppressWarnings("varargs")
    public static <T> List<T> asList(T... a) {
     
     
        return new ArrayList<>(a);
    }

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reference article

• 8 ways to initialize List collection in Java!