Readable code with many components (Swing)
Try to NOT add each UI component in Class fields. Keep then local if possible, as close to usage as possible. Too much class fields does not make class easy readable - as reader think that all of them are do matter.

JLabel and other components, content(text) of which will never be changed, are good candidates to be declared as local variable or without variable at all:

add(new JLabel("text"));