按人口升序排序

Question

我正在尝试学习Java概念。在这里，我正在阅读一个文本文件，并尝试按填充字段的升序对字段进行排序。但是我无法排序，得到NullPointerException。

// File Reading and sending text file fields to POJO class

try (BufferedReader br = Files.newBufferedReader(Paths.get("C:\\Users\\keerti.x\\Documents\\Text.txt"))) {

    String line;
    while ((line = br.readLine()) != null) {
        line = line.trim();

        if ((line.length() != 0)) {
            String[] column = line.split("\\s+");

            TextFilePojo file = new TextFilePojo();

            file.setId(Integer.parseInt(column[0]));
            file.setPopulation(Long.parseLong(column[1]));
            file.setCountryName(column[2]);

            System.out.println(file.getId() + " " + file.getPopulation() + " " + file.getCountryName());
        }
    }
}

// creating an arrayList and Sorting according to ascending order of population 


ArrayList < TextFilePojo > tl = new ArrayList < TextFilePojo > ();

TextFilePojo[] text = new TextFilePojo[10];

for (int i = 0; i < text.length; i++) {
    tl.add(new TextFilePojo(text[i].getId(), text[i].getCountryName(), text[i].getPopulation()));
}

Collections.sort(tl);

for (TextFilePojo pop1: tl) {
    System.out.println(pop1.getCountryName() + " " + pop1.getId() + " " + pop1.getPopulation());
}

我希望输出是

Bhutan 114 10000
India 111 100000
Nepal 113 100000
China 112 10000000

但是我收到nullPointerException”