public void setChainId(String chainId) {
        this.chainId = chainId;
    }
<p>
The Ethereum <code>CHAIN_ID</code> associated with the Ethereum network. Chain IDs are as follows:
</p>
<ul>
<li>
<p>
mainnet = <code>1</code>
</p>
</li>
</ul>

@param chainId
       The Ethereum <code>CHAIN_ID</code> associated with the Ethereum network. Chain IDs are as follows:</p>
       <ul>
       <li>
       <p>
       mainnet = <code>1</code>
       </p>
       </li>
aws-java-sdk-managedblockchain/src/main/java/com/amazonaws/services/managedblockchain/model/NetworkEthereumAttributes.java