# 17 - Libraries

Maciej Walkowiak

# Goals

• Learn what is a library
• Learn how to add library to your project
• Learn how to use functionalities provided in library

# Slides

# Exercises

# Exercise 1

Write a program that checks if all letters in the string are lowercase Use one of the classes from commons-lang library (*Utils)

# Exercise 2

Write a program that adds X number of days to current date and prints the result (as a date too). Use one of the classes from commons-lang library (*Utils) to get current date:

Date today = new Date();

# Exercise 3

Write a program that creates thumbnails of images from directory X (specified by a variable). Use https://github.com/coobird/thumbnailator

# Additional Resources

• Commons Lang Library
• Thumbnailator
• Github API for Java
• Maven)
• Better Builds with Maven
• How to add external JAR to Intellij IDEA project
• Maven Tutorial