mở bd.class ra
mở <init> ,từ dòng 608 sẽ thấy
608. ldc "Rút"
new bk
dup
aload_0
invokespecial bk/<init>(Lbd;)V
invokespecial ca/<init>(Ljava/lang/String;Ldn;)V
putfield bd/be Lca;
aload_0
new ca
dup
ldc "Hạ phỏm"
new bm

ban sua "new bk" thanh "new bm" o duoi dong ldc "Rut" va dong "invokespecial bk/<init>(Lbd;)V" ban cung sua "bk" thanh "bm"