JFrame, JTextArea, JOptionPain, JApplet, clarification?

[Travis Gn]

1. What are the differences between JFrame, JTextArea, JOptionPain, JApplet?

2.I am working with a JFrame and need to print a line on the viewable area, do I just need to add a container? If so what is the syntax? any info will help.

[Ernest Friedman-Hill]

Please don't post the same question to multiple forums.

Followups to the copy over in the Beginner forum, please.