list初始化

方法1

List<String> stringList = new LinkedList<>();
stringList.add("a");
stringList.add("b");
stringList.add("c");

方法2

List<String> stringList = new LinkedList<String>(){{
    add("a");
    add("b");
    add("c");
}};

方法3

List<String> stringList = Arrays.asList("a", "b", "c");

方法4

List<String> list = Stream.of("a", "b", "c").collect(Collectors.toList());

参考文章https://juejin.im/post/5bddcee3e51d4520b6639663