Sprint1_T5_JavaUtils

java -version

Level 1

Java can be used exclusively, or the Apache Commons IO library if you prefer.

• Exercise 1

Create a class that alphabetically lists the contents of a directory received by parameter.

javac src/n1Exe1/App.java
java -cp src n1Exe1.App

• Exercise 2

Add to the class from the previous exercise, the functionality to list a directory tree with the contents of all its levels (recursively) so that they are printed to the screen in alphabetical order within each level, also indicating whether it is a directory (D) or a file (F), and its last modified date.

javac src/n1Exe2/App.java
java -cp src n1Exe2.App

• Exercise 3

Modify the previous exercise. Now, instead of displaying the result on the screen, it saves the result in a TXT file.

javac src/n1Exe3/App.java
java -cp src n1Exe3.App

• Exercise 4

Adds the functionality to read any TXT file and display its contents by console.

javac src/n1Exe4/App.java
java -cp src n1Exe4.App

• Exercise 5

Now the program needs to serialize a Java Object to a .ser file and then deserialize it.

javac src/n1Exe5/App.java
java -cp src n1Exe5.App

Level 2

• Exercise 1

Run exercise 3 from the previous level by parameterizing all methods in a configuration file.

You can use a Java Properties file, or the Apache Commons Configuration library if you prefer.

From the previous exercise, parameterize the following:

Directory to read.

Name and directory of the resulting TXT file.

javac src/n2Exe1/App.java
java -cp src n2Exe1.App

Level 3

• Exercise 1

Create a utility that encrypts and decrypts the files resulting from the previous levels.

Use AES algorithm in ECB or CBC working mode with PKCS5Padding padding method. Either javax.crypto or org.apache.commons.crypto can be used.

javac src/n3Exe1/App.java
java -cp src n3Exe1.App