InetAddress: getLocalHost()

import java.net.InetAddress;

public class MainClass {

  public static void main(String[] args) {

    try {
      InetAddress me = InetAddress.getLocalHost();
      String dottedQuad = me.getHostAddress();
      System.out.println("My address is " + dottedQuad);
    } catch (Exception ex) {
      ex.printStackTrace();
    }
  }
}