Chapter 21.5, Problem 14SC

Explanation of Solution

To make a backup copy of a file:

• Obtain a path for the backup file first.
• Alter the suffix as follows,

Path q = Paths.get(p.toString().replace(“.txt”, “.bak”));

• The user can also alter the suffix as is usual in Linux, insert a “~” to the file name:

  Path q = Paths.get(p.toString() + "~");

• To copy a file, the method “copy()” is used as follows,

  Files...

Explanation of Solution

To overcome the problem:

• To copy a file, the method “copy()” is used as follows,

  Files.copy(p, q);

• If “p” does not exist, the function invocation on the “copy()” method throws an exception.
• Similarly, if the backup file “q” is already exists, then also the call to the method “copy()” throws an exception.
• To overcome the problem of file existence, first delete the file using the method “delete()”, if it already exists...