ask for helf about headlong HOT 3 CLOSED

function arguments are encoded into calldata. that's what headlong does.

Other tools can encode and sign the transaction that contains the calldata. then the transaction has to be broadcast to the network by an ethereum node.

web3j can be used to do the transaction encoding and broadcasting

from headlong.

so , I can use web3j to call on ethereum node and then get headlong to call funtion. Finally , do the transaction by web3j . That right ?

from headlong.

broadcasting through an ethereum node is the final step. encoding the function call with headlong should be the first step.

web3j docs say they have "Support for Alchemy and Infura, so you don't have to run an Ethereum client yourself"

from headlong.