jdk11新特性

新特性

public class Jdk11Demo {
    public static void main(String[] args) {
        autoTypeJudge();
        StrongString();
        http();

    }

    /**
     * 网络请求
     */
    private static void http() {
        var request = HttpRequest.newBuilder()
                .uri(URI.create("http://wanandroid.com/wxarticle/chapters/json"))
                .GET()
                .build();
        var client = HttpClient.newHttpClient();

        // 同步
        HttpResponse<String> response = null;
        try {
            response = client.send(request, HttpResponse.BodyHandlers.ofString());
            System.out.println(response.body());
        } catch (IOException | InterruptedException e) {
            e.printStackTrace();
        }


        // 异步
        client.sendAsync(request, HttpResponse.BodyHandlers.ofString())
                .thenApply(HttpResponse::body)
                .thenAccept(System.out::println);
    }

    /**
     * 字符串加强
     */
    private static void StrongString() {
        System.out.println(" ".isBlank());

        System.out.println("标准的字符串");
        System.out.println(" 首尾空格 ".strip());
        System.out.println(" 头部空格".stripTrailing());
        System.out.println("尾部空格 ".stripLeading());
        System.out.println("Java11 ".repeat(3));
        System.out.println("a\nb\nc\n".lines().count());
    }

    /**
     * 动态类型推导判断
     */
    private static void autoTypeJudge() {
        var jdk11String = "hell jdk 11";
        System.out.println(jdk11String);

        var jdk11Int = 123;
        System.out.println(jdk11Int);
    }


}

结果

hell jdk 11
123
true
标准的字符串
首尾空格
 头部空格
尾部空格 
Java11 Java11 Java11 
3
{"data":[{"children":[],"courseId":13,"id":408,"name":"鸿洋","order":190000,"parentChapterId":407,"userControlSetTop":false,"visible":1},{"children":[],"courseId":13,"id":409,"name":"郭霖","order":190001,"parentChapterId":407,"userControlSetTop":false,"visible":1},{"children":[],"courseId":13,"id":410,"name":"玉刚说","order":190002,"parentChapterId":407,"userControlSetTop":false,"visible":1},{"children":[],"courseId":13,"id":411,"name":"承香墨影","order":190003,"parentChapterId":407,"userControlSetTop":false,"visible":1},{"children":[],"courseId":13,"id":413,"name":"Android群英传","order":190004,"parentChapterId":407,"userControlSetTop":false,"visible":1},{"children":[],"courseId":13,"id":414,"name":"code小生","order":190005,"parentChapterId":407,"userControlSetTop":false,"visible":1},{"children":[],"courseId":13,"id":415,"name":"谷歌开发者","order":190006,"parentChapterId":407,"userControlSetTop":false,"visible":1},{"children":[],"courseId":13,"id":416,"name":"奇卓社","order":190007,"parentChapterId":407,"userControlSetTop":false,"visible":1},{"children":[],"courseId":13,"id":417,"name":"美团技术团队","order":190008,"parentChapterId":407,"userControlSetTop":false,"visible":1},{"children":[],"courseId":13,"id":420,"name":"GcsSloop","order":190009,"parentChapterId":407,"userControlSetTop":false,"visible":1},{"children":[],"courseId":13,"id":421,"name":"互联网侦察","order":190010,"parentChapterId":407,"userControlSetTop":false,"visible":1}],"errorCode":0,"errorMsg":""}