String opcode;
if(insn.name().equals("CBZ"))
    opcode = "" + 10110100;
else if(insn.name().equals("CBNZ"))
    opcode = "" + 01010100;
else
    opcode = StringUtils.leftPad(Integer.toBinaryString(0x54), 8, '0');


//more code.....


System.out.println(insn.name()); //outputs CBNZ
if(insn.name().equals("CBNZ")) //Just to see if I can force the opcode change one last time
    opcode = "" + 01010100;
System.out.println("CBNZ " + opcode); //outputs CBNZ 266304