Java 如何读取 txt 文件的每一列，并将它们放在单独的数组中？
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How do I read each column of a txt file, and place them in separate arrays?
提问by user2805298
I'm doing a Programming Assignment and basically I need to read from a txt file and sort everything in there in different arrays allowing me to display everything in the cmd prompt neatly and be able to delete stuff.
我正在做一个编程作业，基本上我需要从 txt 文件中读取并将其中的所有内容排序在不同的数组中，这样我就可以在 cmd 提示符下整齐地显示所有内容并能够删除内容。
h Vito 123
d Michael 234 Heart
s Vincent 345 Brain Y
n Sonny 456 6
a Luca 567 Business
r Tom 678 Talking Y
j Anthony 789 Maintenance N
d Nicos 891 Bone
n Vicky 911 7
First column needs to be the employeeRole (employee, doctor). The second column being the employeeName. Third column being the employeeNumber and some of them have have a fourth column (if it's a number it's number of patients. Y is for like sweeping, or answering calls)
第一列需要是员工角色（员工、医生）。第二列是员工姓名。第三列是员工编号，其中一些列有第四列（如果是数字，则表示患者数量。Y 表示扫地或接听电话）
So my thought process was put each column into it's own array and then writing it out that way. I was able to put each row into its own array with
所以我的思考过程是将每一列放入它自己的数组中，然后以这种方式写出来。我能够将每一行放入自己的数组中
public class ReadingFile {
// String test;
// char[] employeeRole = new char[9];
String[] employeeRole = new String[9];
String[] employeeName = new String[9], specialty;
String[] wholeLine = new String[9];
// String word;
int[] employeeNum = new int[9];
int r, n, l, num;
public void Reader()
{
Scanner inputStream = null;
Scanner inputStream2 = null;
Scanner inputStream4 = null;
try
{
BufferedReader inputStream3 =
new BufferedReader(new FileReader("data.txt"));
inputStream = new Scanner(new FileInputStream("data.txt"));
inputStream =
new Scanner(new FileInputStream("data.txt"));
inputStream2 =
new Scanner(new FileInputStream("data.txt"));
inputStream4 =
new Scanner(new FileInputStream("data.txt"));
System.out.println("Yeah");
}
catch(FileNotFoundException e){
System.out.println("File Not found");
System.exit(1);
}
for (l=0; l<9; l++)
{
wholeLine[l] = inputStream2.nextLine();
System.out.println(wholeLine[l]);
}
But I couldn't figure out what to do from there. Doing a split would then put an array into an array? Which means I would put each line into an array and then each word into an array?
但我不知道从那里开始做什么。进行拆分会将数组放入数组中吗？这意味着我会将每一行放入一个数组中，然后将每个单词放入一个数组中？
So I tried something else, anything with the length not equal to 1 would be the employeeNum, but then they there were the N's and Y's and the number of pateints.
所以我尝试了其他东西，长度不等于 1 的任何东西都是员工编号，但是他们有 N 和 Y 以及专利数量。
for(r=0; r<9; r++) //role
{
String next = inputStream4.next();
while( next.length() != 1)
{
next = inputStream4.next();
}
employeeRole[r] = next;
System.out.println(employeeRole[r]);
}
I also tried
我也试过
for (r=0; r<9; r++)
{
employeeRole[r] = wholeLine[r].substring(wholeLine[r].indexOf(1));
//inputStream.nextLine();
System.out.println(employeeRole[r]);
}
I'm just not sure if I'm going the right way about it? If I'm making it more difficult than it really is? Or if there's an easier way to do this. But after everything is done, the output should be able to basically say
我只是不确定我是否走对了路？如果我让它变得比实际更困难？或者如果有更简单的方法来做到这一点。但是一切都做完之后，输出应该基本可以说
Doctors: 2
Name: Michael Employee Number: 234 Specialty: Heart
Name: Nicos Employee Number: 891 Specialty: Bone
Any help would be greatly appreciated, thanks!
任何帮助将不胜感激，谢谢！
采纳答案by alfasin
You don't have to open 4 streams in order to read the file (I guess you wanted to open "one per column" but you shouldn't do it).
您不必打开 4 个流来读取文件（我猜您想打开“每列一个”，但您不应该这样做）。
Second, you can split the string on spaces (" ") which will provide you the columns (for every line separately) exactly like you want.
其次，您可以在空格 (" ") 上拆分字符串，这将为您提供您想要的列（分别为每一行）。
Code example:
代码示例：
BufferedReader br = null;
String[] characters = new String[1024];//just an example - you have to initialize it to be big enough to hold all the lines!
try {
String sCurrentLine;
br = new BufferedReader(new FileReader("data.txt"));
int i=0;
while ((sCurrentLine = br.readLine()) != null) {
String[] arr = sCurrentLine.split(" ");
//for the first line it'll print
System.out.println("arr[0] = " + arr[0]); // h
System.out.println("arr[1] = " + arr[1]); // Vito
System.out.println("arr[2] = " + arr[2]); // 123
if(arr.length == 4){
System.out.println("arr[3] = " + arr[3]);
}
//Now if you want to enter them into separate arrays
characters[i] = arr[0];
// and you can do the same with
// names[1] = arr[1]
//etc
i++;
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (br != null)br.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
