publicvoidexample(){ // val -> final List<String> val example = new ArrayList<String>(); example.add("Hello, World!"); // val -> final String val foo = example.get(0); System.out.println(foo.toLowerCase());
// val -> final Map<Integer, String> val map = new HashMap<Integer, String>(); map.put(0, "zero"); map.put(5, "five"); // val -> final Map.Entry<Integer, String> for (val entry : map.entrySet()) { System.out.printf("%d: %s\n", entry.getKey(), entry.getValue()); }
// val -> final Person val person = new Person(); person.setName("amos"); person.setAge(22); System.out.println(person);
// val -> final String[] val strings = new String[]{ "中国", "唐伯虎", "美人鱼" }; // val -> final String val str = "美人鱼";
val foundStr = Stream.of(strings).filter(s -> s.equals(str)).findAny().orElse("null"); System.out.println(foundStr); }