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Please post the code showing what you have tried and the error messages you get.
The posted code does not show the definition for the variable: beverageJComboBox.

Take a look at the tutorial: Lesson: Generics (Updated) (The Java™ Tutorials > Learning the Java Language)

Yes, those look like missing generic code.

The IDE is ignoring the warnings. That can lead to problems when some of the warnings really effect how the code runs. For example try this statement: if( 2>1); using the -Xlint option gives this...

Please copy the full text of the error messages and paste it here.

The compiler is recommending that you use the -Xlint option to get a full description of the errors.
For example:
D:\Java\jdk1.7.0_45\bin\javac.exe -cp . -Xlint TestCode18.java

What program are you trying to execute: javac or java
It would help if you copied the full contents of the command prompt window and pasted it here.

On Windows To copy the contents of the...