的ReadLine（）;在这里不起作用 [英] Readline(); doesn't work here
本文介绍了的ReadLine（）;在这里不起作用的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
import java.io.File;
import java.io.FileReader;
import java.util.Scanner;
public class Test {
public static void main ( String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Enter name of input file: ");
String fileName = input.nextLine();
String text = " ";
String line = fileName.readLine();
while ( line != null)
{
text += line ;
line = fileName.readLine();
}
System.out.print(text);
}
}
我尝试过：
它说String没有名为readLine（）的函数
What I have tried:
it says String doesn't have function called readLine()
推荐答案
那是因为filename是定义为String。您不对文件名执行文件操作。在您的情况下，您使用文件名来打开FileInputStream。然后你可以在那个流上调用readline（）。
通过本教程 [ ^ ]因为你'我将不得不重写你的代码。
That's because "filename" is defined as a String. You don't do a file operation on a filename. In your case, you use the filename to open a FileInputStream. You then can call readline() on that stream.
Go through this tutorial[^] because you're going to have to rewrite your code a little bit.
这篇关于的ReadLine（）;在这里不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
