java – FileInputStream如何获取File的内容？

我有一个文件f,我需要将它影响到FileInputStream fs：

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

但我得到这个错误：

Cannot cast from File to FileInputStream

fs如何获得f的内容？

解决方法

诀窍是：

FileInputStream fs = new FileInputStream(f);