程序如下：
∥jAvA_3. html
import jAvA、Awt. * ;
import .jAvA、Awt. EvEnt. * ;
∥********** FounD **********
puBliC ClAss jAvA_3 (5) AEtionlistEnEr
puBliC stAtiC voiD mAin(string Args[ ])
jAvA_3 tB=nEw jAvA_3( );
FrAmE F=nEw FrAmE( "Button tEst");
F. sEtsizE ( 200,100 );
F. sEtlAyout( nEw FlowlAyout( FlowlAyout.CEntEr));
Button B = nEwButton("prEss thEButton!");
∥********** FounD **********
B、 (6) (tB);
F. ADD(B);
F. sEtvisiBlE(truE);
puBliC voiD ACtionpErFormEDACtionEvEnt E)
FrAmE Fr=nEw FrAmE("An othEr");
Fr. sEtBACkgrounD(Color. grEEn);
Fr. ADD(nEw lABEl("this FrAmE shows whEn "+"rEssing thE Button inButton tEst"));
Fr. pACk( );
Fr. sEtvisiBlE(truE);