A、File f=new File("d:\\abc\\x.txt"); Scanner cin=new Scanner(f);
B、File f=new File("d:\abc\x.txt"); Scanner cin=new Scanner(f);
C、File f=new File("d:/abc/x.txt"); Scanner cin=new Scanner(f);
D、File f=new File("d://abc//x.txt"); Scanner cin=new Scanner(f);