Different behaviour of java bytecode

Question

I am a newbee in Java Bytecode. I was understanding the bytecode through some examples but I got stuck in an example.
These are my java and bytecode file

Answer 1

iconst can push constant values -1 to 5. It is a single-byte instruction.

bipush can push constant values between -128 and 127. It is a two-byte instruction.

To push 9 you cannot use iconst. There is no iconst_9 instruction.