java - 使用java读取新行字符

Question

帮帮我，我刚在网上看到这个例子。我想用它以包含新行的相同格式准确打印文本文件的内容，但它只打印出第一行。谢谢

 import java.util.*;
 import java.io.*;

      public class Program
      {
          public static void main(String[] args)throws Exception
          {
          Scanner scanner = new Scanner(new FileReader("B:\\input.txt"));
          String str = scanner.nextLine(); 

          // Convert the above string to a char array.
          char[] arr = str.toCharArray();

          // Display the contents of the char array.
          System.out.println(arr);
          }
      }

Answer 1

public class Program {
    public static void main(String[] args) throws Exception {
        Scanner scanner = new Scanner(new FileReader("B:\\input.txt"));
        String str;
        while ((str = scanner.nextLine()) != null)
            // No need to convert to char array before printing
            System.out.println(str);
    }
}

nextLine() 方法只提供一行，你必须调用它直到有一个 null ( ~ C's EOF )