TO DO:

• http://www.java-examples.com/

Topics:

1. Java Overview
2. Java Versions
3. Programming in Java: Basic Concepts
4. Basics of OOP in Java
5. Basics of Java Syntax
6. Handling Exceptions in Java
7. Java IO Libraries
8. Java Style Guidelines
9. Primitive data types in Java
10. Reference types in Java
11. Type Conversion in Java
12. How To Develop A Class in Java
13. Java library

Code Review:

• Java Code Review

Practical examples:

• RegExps in Java

• Groovy
  Most mature and easiest for Java developers to learn
• Scala
  Statically typed with immutables; a good transitional language from OOP to functional programming
• Clojure
  Lisp on the JVM; pure functional language with immutables
• JRuby
  Compiles Ruby
• Jython
  Compiles Python

• Ant - build.xml
• Gradle - build.gradle
• Maven - pom.xml

./gradlew
./gradlew clean build

echo -n | openssl s_client -connect example.com:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > /tmp/examplecert.crt
openssl x509 -in /tmp/examplecert.crt -text
sudo keytool -import -trustcacerts -keystore /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/security/cacerts -storepass changeit -noprompt -alias mycert -file /tmp/examplecert.crt

Find out about dependencies for compiled classes:

javap ClassName

Execute compiled Groovy classes:

java -cp $GROOVY_HOME/embeddable/groovy-all-2.4.7.jar:. class_name # unix
or
java -cp %GROOVY_HOME%\embeddable\groovy-all-2.4.7.jar:. class_name # windows