InvertIpAddressCod.java

public  class InvertIpAddressCod implements IpAddressInvert {

 

 public void invertIpAddress(String ip) {
  int a=ip.indexOf(".");
     int b=ip.indexOf(".",a+1);
     int c=ip.lastIndexOf(".");
     //System.out.println(a+" "+b+" "+c);
     String s1,s2,s3,s4;
     s1=ip.substring(0, a);
     s2=ip.substring(a+1,b);
     s3=ip.substring(b+1, c);
     s4=ip.substring(c+1);
     System.out.println(s4+"."+s3+"."+s2+"."+s1);

 }

}
class as{
 
 public static void main(String[] args) {

  InvertIpAddressCod a=new InvertIpAddressCod();
  a.invertIpAddress("1.2.3.4");
 }
}

public interface IpAddressInvert {
 public void invertIpAddress(String ip);

}