java 错误：找不到符号：类 FileNotFoundException
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error: cannot find symbol: class FileNotFoundException
提问by ashwetzer
I'm receiving the following error:
我收到以下错误：
printfile.java:6: error: cannot find symbol
throws FileNotFoundException {
^
symbol: class FileNotFoundException
location: class printfile
for the following code:
对于以下代码：
import java.io.File;
import java.util.Scanner;
public class printfile {
public static void main(String[]args)
throws FileNotFoundException {
Scanner keyboard = new Scanner(System.in);
System.out.println (" What file are you looking for? ");
String searchedfile = keyboard.next();
File file = new File(searchedfile);
if (file.exists()) {
System.out.println(" Okay, the file exists... ");
System.out.print(" Do you want to print the contents of " + file + "?");
String response = keyboard.next();
if (response.startsWith("y")) {
Scanner filescan = new Scanner(file);
while (filescan.hasNext()) {
System.out.print(filescan.next());
}
}
else {
System.out.print(" Okay, Have a good day.");
}
}
}
}
How can this error be resolved?
如何解决此错误？
回答by Genos
To use a class that is not in the "scope" of your program, (i.e. FileNotFoundException), you have to:
要使用不在程序“范围”内的类（即FileNotFoundException），您必须：
Call it's fully qualified name:
称其为完全限定名称：
// Note you have to do it for every reference.
public void methodA throws java.io.FileNotFoundException{...}
public void methodB throws java.io.FileNotFoundException{...}
OR
或者
Import the class from it's package:
从它的包中导入类：
// After import you no longer have to fully qualify.
import java.io.FileNotFoundException;
...
public void methodA throws FileNotFoundException{...}
public void methodB throws FileNotFoundException{...}
Suggest also taking a look in thisquestion, explains pretty much everything you might want to know about Java's acess control modifiers.
建议也看看这个问题，几乎解释了你可能想知道的关于 Java 的访问控制修饰符的所有内容。
