J.Olufsen questions

• Cannot compare two objects using instanceof
• How to define child static class which extends parent abstract?
• How to check if all elements of type integer is within given range using lambdas and streams in Java 8?
• How to add Maven to existing Java WebApplication in IntelliJ?
• ERROR: operator does not exist: numeric ~* unknown
• Why docker-maven-plugin fails to pick up correct jar file to include in docker image?
• How to make Maven to download source code and javadoc for specific dependencies?
• How to install NetBeans C/C++ compiler?
• PHP extension "curl" must be loaded while installing on xampp Windows 7
• How to bind swing.JTextArea to PrintStream to accept data

J.Olufsen answers