所以我目前正在大学读一门java课程,到目前为止,我已经成功地找到并解决了这些问题。到现在。当我尝试打开并读取文件时,我遇到了某种编译错误。我正在关注我的课本教科书,其基本代码的设置说明是这样做的,但它以错误结束。然后,我从我的书中获取了源代码并将其放入Dr.Java中,但它仍然编译错误,而且来自本书。所以我不确定问题是什么,并且想知道是否有人可以引导我朝着正确的方向前进。 F.Y.I.它总是相同的两个错误。谢谢。
import java.util.Scanner; // Needed for the Scanner class
import java.io.*; // Needed for the File class
/**
This program reads data from a file.
*/
public class FileReadDemo
{
public static void main(String[] args) throws IOException
{
// Create a Scanner object for keyboard input.
Scanner keyboard = new Scanner(System.in);
// Get the filename.
System.out.print("Enter the filename: ");
String filename = keyboard.nextLine();
// Open the file.
File file = new File(filename);
Scanner inputFile = new Scanner(file);
// Read lines from the file until no more are left.
while (inputFile.hasNext())
{
// Read the next name.
String friendName = inputFile.nextLine();
// Display the last name read.
System.out.println(friendName);
}
// Close the file.
inputFile.close();
}
}
以下是不断出现的错误代码。
发现了2个错误:File: C:\Users\aspea\Documents\Intro to Computers and Java\FileReadDemo.java [line: 20]
Error: constructor File in class File cannot be applied to given types;
required: no arguments
found: java.lang.String
reason: actual and formal argument lists differ in length
File: C:\Users\aspea\Documents\Intro to Computers and Java\FileReadDemo.java
[line: 21]
Error: no suitable constructor found for Scanner(File)
constructor java.util.Scanner.Scanner(java.lang.Readable) is not applicable
(argument mismatch; File cannot be converted to java.lang.Readable)
constructor java.util.Scanner.Scanner(java.io.InputStream) is not applicable
(argument mismatch; File cannot be converted to java.io.InputStream)
constructor java.util.Scanner.Scanner(java.io.File) is not applicable
(argument mismatch; File cannot be converted to java.io.File)
constructor java.util.Scanner.Scanner(java.nio.file.Path) is not applicable
(argument mismatch; File cannot be converted to java.nio.file.Path)
constructor java.util.Scanner.Scanner(java.lang.String) is not applicable
(argument mismatch; File cannot be converted to java.lang.String)
constructor java.util.Scanner.Scanner(java.nio.channels.ReadableByteChannel) is not applicable
(argument mismatch; File cannot be converted to java.nio.channels.ReadableByteChannel)
答案 0 :(得分:1)
您似乎有一些不是File
的自定义java.io.File
类,以下错误表明这一事实:
Error: constructor File in class File cannot be applied to given types;
required: no arguments
found: java.lang.String
reason: actual and formal argument lists differ in length
和
File cannot be converted to java.io.File