Explanation: In the actionPerformed method, when the fi rst button (with the caption “ First ”) is
clicked it is to be hidden and the second button (with the caption “ Second ”) displayed. When second button
is clicked, the reverse is done (i.e., display the fi rst and hide the second). This has been made possible by
using the method setVisibleseen earlier.
16.4.2 The Label Class
A Label object is a component for placing text in a container. A label displays a single line of read-only
text (i.e., static text). ...
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