(a) What three elements are needed in any Java GUI? (b) What is the difference between a frame and a panel? (c) What is the relationship between an event and a listener? (d) Can we add any kind of...

(a) What three elements are needed in any Java GUI?

(b) What is the difference between a frame and a panel?

(c) What is the relationship between an event and a listener?

(d) Can we add any kind of listener to any component? Explain.

(e) What type of event does a push button generate? A text field? A check box?

(f) Compare and contrast check boxes and radio buttons.