java - FileInputStream 如何获取 File 的内容？

Question

我有一个文件f，我需要将它影响到一个FileInputStream fs :

File f = new File("C:/dir/foo.txt");
FileInputStream fs = (FileInputStream)f;

但是我得到这个错误:

Cannot cast from File to FileInputStream

fs如何获取f的内容？

Answer 1

技巧是这样的:

FileInputStream fs = new FileInputStream(f);