阿里巴巴资深技术专家雷卷：值得开发者关注的 Java 8 后时代的语言特性

Map<String, List<Map<String,Object>>>  store = new ConcurrentHashMap<String, List<Map<String,Object>>>();        Map<String, List<Map<String,Object>>>  store = new ConcurrentHashMap<>();        Map<String, List<Map<String,Object>>>  store = new ConcurrentHashMap<String, List<Map<String,Object>>>();  //lambda  BiFunction<String, String, String> function1 = (var s1, var s2) -> s1 + s2;        System.out.println(function1.apply(text1, text2));

sudo cp bin/confd /usr/local/binconfd

ProcessHandle ph =  ProcessHandle.of(89810).get();System.out.println(ph.info());

Set<Integer> ints = Set.of(1, 2, 3);List<String> strings = List.of("first", "second");

 HttpClient client = HttpClient.newHttpClient();        HttpRequest req =                HttpRequest.newBuilder(URI.create("https://httpbin.org/ip"))                        .header("User-Agent", "Java")                        .GET()                        .build();        HttpResponse<String> resp = client.send(req, HttpResponse.BodyHandlers.ofString());        System.out.println(resp.body());

String jsonText = "{\"id\": 1, \"nick\": \"leijuan\"}";

//language=json  String cleanJsonText = """        {"id": 1, "nick": "leijuan"}""";

    //language=html    String textBlock = """    <span style="color: green">Hello %s</span>""";    System.out.println(textBlock.formatted(nick));

  //legacy    switch (DayOfWeek.FRIDAY) {        case MONDAY: {            System.out.println(1);            break;        }        case WEDNESDAY: {            System.out.println(2);            break;        }        default: {            System.out.println("Unknown");        }    }    //Arrow labels    switch (DayOfWeek.FRIDAY) {        case MONDAY, FRIDAY, SUNDAY -> System.out.println(6);        case TUESDAY -> System.out.println(7);        case THURSDAY, SATURDAY -> System.out.println(8);        case WEDNESDAY -> System.out.println(9);    }

    //Yielding a value    int i2 = switch (DayOfWeek.FRIDAY) {        case MONDAY, FRIDAY, SUNDAY -> 6;        case TUESDAY -> 7;        case THURSDAY, SATURDAY -> 8;        case WEDNESDAY -> 9;        default -> {            yield 10;        }    };

<dependency>            <groupId>com.github.bsideup.jabel</groupId>            <artifactId>jabel-javac-plugin</artifactId>            <version>0.2.0</version> </dependency>

<plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-compiler-plugin</artifactId>                <version>3.8.1</version>                <configuration>                    <source>13</source>                    <target>8</target>                    <release>8</release>                </configuration></plugin>