Java, step by step

17/06/30
1. Super()
Super in Java
https://stackoverflow.com/questions/3767365/super-in-java
super keyword in Java
https://www.javatpoint.com/super-keyword

2. @Override
What does @Override mean?
https://stackoverflow.com/questions/4341432/what-does-override-mean

17/07/01
3. @SuppressWarnings("")
Since Java 5.0, you can disable compilation warnings relative to a subset 
https://www.ibm.com/support/knowledgecenter/en/SSQ2R2_9.1.0/org.eclipse.jdt.doc.user/tasks/task-suppress_warnings.htm