public void not(){
  mv.visitInsn(Opcodes.ICONST_1);
  mv.visitInsn(Opcodes.IXOR);
}

public void not ( ) { mv . visitInsn ( Opcodes . ICONST_1 ) ; mv . visitInsn ( Opcodes . IXOR ) ; }
generates the instructions to compute the bitwise negation of the top stack value .
