File file=new file（“a.txt”);其中 a.txt这个文件必须存在。

A、InputStream in=new FileInputStream("file.txt");

B、FileInputStream in=new FileInputStream(new File("file.txt"));

C、InputStream in=new FileReader("file.txt");

D、InputStream in=new InputStream("file.txt");

A、Dim strFileName As String strFileName = "C:\T1.txt" FileOpen(1,strFileName,OpenMode.Input)

B、Dim strFileName As String strFileName = "C:\T1.txt" FileOpen(1,"strFileName",OpenMode.Input)

C、FileOpen(1,C:\T1.txt,OpenMode.Input)

D、FileOpen(1,C:\T1.txt,OpenMode.Output)

E、FileOpen(1,"C:\T1.txt",OpenMode.Output)

A. FileOutputStream out=new FileOutputStream（“file.txt”，true）；

B. OutputStream out=new FileOutputStream（“file.txt”，“append”）；

C. OutputStream out=new FileOutputStream（“file.txt”）；

D. FileOutputStream out=new FileOutputStream（new file（“file.txt”））；

E. OutputStream out=new FileOutputStream（new File（“file.txt”），true.；

A、Dim F As String F = "C:\T1.txt" FileOpen(1, F, OpenMode.Input)

B、Dim F As String F = "C:\T1.txt" FileOpen(1, "F", OpenMode.Input)

C、FileOpen(1, "C:\T1.txt", OpenMode.Output)

D、FileOpen(1, C:\T1.txt, OpenMode.Input)

A、ifstream file("d:\myfile\test.txt");

B、ifstream file("d:\\myfile\\test.txt");

C、ifstream file;file.open("d:\\myfile\\test.txt");

D、ifstream *pFile=new ifstream("d:\\myfile\\test.txt");