public void setPreSharedKey(String preSharedKey) {
        this.preSharedKey = preSharedKey;
    }
<p>
The pre-shared key (PSK) to establish initial authentication between the virtual private gateway and the customer
gateway.
</p>

@param preSharedKey
       The pre-shared key (PSK) to establish initial authentication between the virtual private gateway and the
       customer gateway.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/TunnelOption.java