java为什么PrintWriter对象抛出FileNotFoundException？

Question

我的意思是，如果找不到文件，它会自动创建一个同名的新文件（不像扫描仪），对吗？那么，例外的意义是什么

Answer 1

FileNotFoundException不一定表示文件不存在。例如，如果传入的名称表示目录而不是文件，jvm将无法写入相应的句柄，并将通过异常报告相同的句柄

根据java文档

Throws: FileNotFoundException - If the given file object does not denote an existing, writable regular file and a new regular file of that name cannot be created, or if some other error occurs while opening or creating the file

Answer 2

请查看Javadoc API，其中说明：

Throws: FileNotFoundException - If the given file object does not denote an existing, writable regular file and a new regular file of that name cannot be created, or if some other error occurs while opening or creating the file

[1]https://docs.oracle.com/javase/7/docs/api/java/io/PrintWriter.html#PrintWriter(java.io.File)