How to initialize arrayList in one line

 

First method : Using ArrayList

ArrayList<String> list = new ArrayList<String>() {{

add("A");

add("B");

add("C");

}};

Second Method : For Java 9 or Later 

List<String> strings = List.of("foo", "bar", "baz");

Third Method : For Java 8 or earlier

List<String> strings = Arrays.asList("foo", "bar", "baz");

Fourth Method :

ArrayList<String> list = new ArrayList<String>() {{
    add("A");
    add("B");
    add("C");
}};