Java将文件内容添加到数组列表

Question

Hi i am new to Java working with files. I have got a text file called banking.txt located in C: but when i try put its content into an ArrayList and print it prints out nothing. Is the file path i am using incorrect or is it something different?

import java.util.ArrayList;
import java.util.Scanner;
import java.io.*;

public class FileP {
    public static void main(String[] args) throws FileNotFoundException {
        Scanner read = new Scanner(new File("C:\\banking.txt"));
        ArrayList<String> myList = new ArrayList<String>();
        while(read.hasNextLine()) {
            myList.add(read.nextLine());
        }
        System.out.println(myList);
    }
}

Answer 1

Try to use InputStream

    import java.io.BufferedReader;
    import java.io.FileInputStream;
    import java.io.IOException;
    import java.util.ArrayList;
    import java.io.InputStream;
    import java.io.InputStreamReader;

    public class FileP {

      public static void main(String[] args) throws IOException {

        ArrayList<String> myList = new ArrayList<String>();
        InputStream is = new FileInputStream("C:\\banking.txt");
        BufferedReader buf = new BufferedReader(new InputStreamReader(is));
        String line = buf.readLine();
        StringBuilder sb = new StringBuilder();
        while (line != null)

        {
          myList.add(line);
          line = buf.readLine();
        }

       System.out.println("myList : " + myList);
      }
    }

Answer 2

I would recommend using the lines method of Java 8:

 Stream<String> content = Files.lines("C:\\banking.txt")
 content.forEach(System.out::println);

Answer 3

I guess you need to use this code as the Scanner :

Scanner in = new Scanner(new FileReader("C:\\banking.txt"));

This will read the file as a String and you can add it to Array. Check this post for more: Reading a plain text file in Java