打印并访问List <String []>

Question

我正在读取文件并将其存储在t1中.如何访问t1中的元素？当我尝试打印它时,我得到的是地址而不是值.还有什么区别String和String[]？

        CSVReader reader = new CSVReader(new FileReader("src/new_acquisitions.csv"));
        List <String[]> t1 = reader.readAll();

        int i = 0
        while(i < t1.size()) {
          System.out.println(t1.get(i));
          i++;
        }

输出:

[Ljava.lang.String;@9304b1
[Ljava.lang.String;@190d11
[Ljava.lang.String;@a90653
[Ljava.lang.String;@de6ced

Answer 1

String []是一个字符串数组,因此它没有像你期望的那样打印,请尝试:

for (int i = 0; i < t1.size(); i++) {
    String[] strings = t1.get(i);
    for (int j = 0; j < strings.length; j++) {
        System.out.print(strings[j] + " ");
    }
    System.out.println();
}

或者更简洁:

for (String[] strings : t1) {
    for (String s : strings) {
        System.out.print(s + " ");
    }
    System.out.println();
}

或者更好的是:

for (String[] strings : t1) {
    System.out.println(Arrays.toString(strings));
}