程序如下：
∥jAvA_2. jAvA
import jAvA、Awt. *;
import jAvA、Awt. EvEnt. * ;
puBliC ClAss jAvA_2 ExtEnDs FrAmE
puBliC jAvA_2( string s)
supEr(s);
puBliC stAtiC voiD mAin( string Args[ ] )
jAvA_2 Fr=nEw jAvA_2 ("tEsting");
Button B=nEwButton( "plEAsE prEss mE!");
∥********** FounD ************
B、ADDACtionlistEnEr( (3) );
Fr. ADD(B);
Fr. sEtsizE(200,200);
Fr. ADDwinDowlistEnEr( nEw winDowADAptEr( )
puBliC voiD winDowClosing( winDowEvEnt E)
systEm. Exit(0);
);
∥********** FounD **********
Fr. sEtvisiBlE( (4) );
ClAss hAnDlEButton implEmEntsACtionlistEnEr
puBliC voiD ACtionpErFormEDACtionEvEnt E)
systEm. out. println("thE Button is prEssED!");