合并文件中的行以对应给定的 header

Question

我有一个文件，其中包含一系列 header，后跟一行或多行对 header 的描述。类似于：

>Animal|Dog
this is a dog
which barks
>Animal|Cat
Cats often meow
>Animal|Bat
Bat will fly
and comes out at night
eating small insects

我正在尝试合并文件的元素，以便每个描述都放在一行中并与其给定的 header 相对应。喜欢：

Animals = [Dog,this is a dog which barks],[Cat,Cats often meow],[Bat,Bat will fly and come out at night eating small insects]

我不确定如何完成此操作。

public static void main(String[] args) {

    try (BufferedReader br = new BufferedReader(new FileReader("speciesFile.txt"))) {
        String line;
        while ((line = br.readLine()) != null) {
            if (line.contains(">")) {

                String[] array = line.split("|");
                if(array.length == 2){
                    String name = array[1];
                    // add to array
                }
            }else{
                // line is description
                // check if line below is description and merge
                // add to array
            }
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

Answer 1

这是实现此目的的一种方法。我使用的不是数组，而是 ArrayList 并且我创建了一个名为 Animal 的简单模型对象来包含每个动物记录。

查看代码中的注释了解更多详情。

public class MergeLines
{
    // Animal model object:
    // Note: This can placed in another file called Animal.java and
    // made into a public, non-static class, but I created it in this
    // manner for purpose of having a and self-containted example.
    private static class Animal
    {
        private String name;
        private String description;

        public Animal(String name)
        {
            this.name = name;
        }

        public void setDescription(String description)
        {
            this.description = description;
        }

        @Override
        public String toString ()
        {
            return "[" + name + "," + description + "]";
        }
    }

    public static void main (String[] args)
    {
        // this list will hold our animals
        List<Animal> animals = new ArrayList<Animal>();

        try (BufferedReader br = new BufferedReader(new FileReader("speciesFile.txt")))
        {
            String line;
            String description = "";
            Animal animal = null;
            while ((line = br.readLine()) != null)
            {
                if (line.contains(">"))
                {
                    // check if we had a previous animal
                    if (description.length() > 0 && animal != null)
                    {
                        // set the description and add to the list
                        animal.setDescription(description);
                        animals.add(animal);

                        // reset for the next animal
                        description = "";
                        animal = null;
                    }

                    // Note: you had split("|") but that is incorrect 
                    // since the '|' character means OR in regex.
                    String[] array = line.split("\|");
                    if (array.length == 2)
                    {
                        String name = array[1];

                        // create the animal
                        animal = new Animal(name);
                    }
                }
                else
                {
                    description = description + " " + line;
                }
            }

            // add the last animal to the list
            if (animal != null)
            {
                animal.setDescription(description);
                animals.add(animal);
            }
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }

        // finally, print them out.
        System.out.println("Animals = " + animals);
    }
}

输出：

Animals = [[Dog, this is a dog which barks], [Cat, Cats often meow], [Bat, Bat will fly and comes out at night eating small insects]]

合并文件中的行以对应给定的 header

Merging lines in a file to correspond with a given header

java

arrays

file

bufferedreader