Java 11 新特性

 String multilineString = "Baeldung \n \n developers \n  Java.Baeldung helps \n \n developers \n Java.";

 //按照换行符读取字符串
    List collect = multilineString.lines()
            .filter(line -> !line.isBlank())
            .map(String::strip)
            .collect(Collectors.toList());

//删除指定的字符
    Stream baeldung_helps = collect.stream().dropWhile(t -> t.equalsIgnoreCase("developers"));
    List collect1 = baeldung_helps.collect(Collectors.toList());

//获取指定的字符

    Stream baeldung_helps1 = collect.stream().takeWhile(t -> t.equalsIgnoreCase("developers"));
    List collect11 = baeldung_helps1.collect(Collectors.toList());


 //集合转变为数组

    Object[] objects = collect.toArray();

   //读取文件流
    FileInputStream fileInputStream = new FileInputStream("D:\\ZK\\2.txt");


    FileOutputStream outputStream = new FileOutputStream("D:\\ZK\\1.txt");
 //复制文件
 fileInputStream.transferTo(outputStream);

    Path path = Paths.get("D:\\ZK\\2.txt");

 //读取文件
    String s = Files.readString(path);

//文件写入
    Files.writeString(path , "你好");

  
//创建集合
    List integers = List.of(1, 2, 3, 2, 2, 2);
    List integers1 = List.of(1, 2, 3, 2, 2, 5);
//复制集合
    Set integers3 = Set.copyOf(integers);

    System.out.println(integers3);

//创建map ,其中key 不可以重复
    Map stringStringMap = Map.of("1", "1");

    Map stringStringMap1 = Map.of("1", "1", "2", "2");

    List> integers2 = List.of(integers, integers1);
    System.out.println("----------------");

    List> lists = List.copyOf(integers2);

}