第151題

Given that the current directory is empty, and that the user has read and write privileges to the current
directory, and the following:

1. import java.io.*;
2. public class Maker{
3. public static void main(String args){
4. File dir = new File("dir");
5. File f = new File(dir, "f");
6. }
7. }

Which statement is true?

A. Compilation fails.
B. Nothing is added to the file system.
C. Only a new file is created on the file system.
D. Only a new directory is created on the file system.
E. Both a new file and a new directory are created on the file system.
答案：B
參考：10-3 File類別
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4. File dir = new File("dir"); //建立dir物件
5. File f = new File(dir, "f"); //建立f物件
但都沒有呼叫...create new file 或 mkdirs
所以沒有東西新增到檔案系統中