java如何獲取本機IP

public static void main(String[] args) {

        // TODO Auto-generated method stub

        InetAddress ia=null;

        try {

            ia=ia.getLocalHost();

             

            String localname=ia.getHostName();

            String localip=ia.getHostAddress();

            System.out.println("本機名稱是："+ localname);

            System.out.println("本機的ip是 ："+localip);

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }