java - 如何使用 Printwriter 将字符串数组写入 java 中的文本文件？

Question

我需要帮助使用 Printwriter 将数组对象的一些内容(以下是我正在使用的数组的两个示例)写入文本文件。有任何想法吗？我是初学者，所以越简单越好，谢谢!

Astronauts[0][0] = new Passengers(-1, "", 1, 0, 0, "", "", 0, "", "", "", "", ""); 

Astronauts[0][1] = new Passengers(0, "Pilot", 2424, 14, 0, "Bruce", "Banner", 0, "678-884-6325", "Mom", "678-884-6323","","");

Astronauts[0][2] = new Passengers(0, "Pilot", 1248, 3, 0, "Sally", "Forth", 0, "678-921-1135", "Hannah", "678-921-1130","","");


 Astronauts[1][0] = new Passengers(-1, "", 2, 0, 0, "", "", 0, "", "", "", "", "");

Astronauts[1][1] = new Passengers(0, "Pilot", 1022, 55, 0, "Buz", "Aldrin", 0, "404-014-4553", "June", "404-014-4555","","");

Astronauts[1][2] = new Passengers(0, "Pilot", 2813, 8, 0, "Alice", "Dyer", 0, "678-884-6325", "Mom", "678-884-6323","","");

Answer 1

我不确定我是否正确地捕获了您的问题，因为将数组的内容写入文件非常简单:

String[] arr = {"a", "b", "c"};
try {
    PrintWriter pw = new PrintWriter(new FileWriter("output.txt"));
    pw.println(Arrays.toString(arr));
    pw.flush();
    System.out.println("Finished");
} catch (IOException e) {
    e.printStackTrace();
}

[编辑]

我意识到我可能没有解决您的整个问题。如果您想知道如何编写数组中包含的对象的所需特征，您可以覆盖 toString()您的自定义类的方法:

class A {
    public static void main(String[] args) {
        B[] bs = {new B("a", "b"),
                  new B("c", "d"),
                  new B("e", "f"),
                  new B("g", "h")};

        try {
            PrintWriter pw = new PrintWriter(new FileWriter("output.txt"));
            for (B b : bs) {
                pw.println(b);
            }
            pw.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("Finished");
    }
}

class B {
    private String prop1;
    private String prop2;

    public B (String prop1, String prop2) {
        this.prop1 = prop1;
        this.prop2 = prop2;
    }

    @Override
    public String toString() {
        return this.prop1 + " " + this.prop2;
    }
}