Java 抓出 IP Address

import java.net.*;

class test {

 public static void main(String[] args) {
    System.out.println((new test()).getAddress()); //在這顯示ip
 }
  public String getAddress() {
    InetAddress localIp;
    try{
      localIp=InetAddress.getLocalHost();
      String ip=localIp.getHostAddress();
      return ip;
    }catch(UnknownHostException une)
    {
    }
    return null;
  }
}