Cannot create method call in ClassConcept Follow

Please take a look at the attached image. After importing java.lang and

javax.swing, I wrote the first two lines, but somehow I can't write the

third one "frame.setVisible(true);": no matter, whether I type "frame." or

"frame.", it never accepts it as a method

call. Is there something obvious I'm doing wrong?

Cheers,

Tom

PS: Happy New Year!