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Copy pathexp4.java
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102 lines (50 loc) · 1.78 KB
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import java.util.*; import java.lang.String;
class Dns{
String subdns (String s)
{
if (s.contains(".") == true)
{
System.out.print("Now in Server: \t"); int dotloc = s.indexOf(".");
StringBuilder sb1 = new StringBuilder(s.substring(0,dotloc)); sb1.reverse();
System.out.println(sb1.toString());
dotloc++;
s = s.substring(dotloc); return subdns(s);
}
else{
StringBuilder sb1 = new StringBuilder(s); sb1.reverse();
System.out.print("Now in Server: \t"); return(sb1.toString());
}
}
String subdns2 (String s)
{
if (s.contains(".") == true)
{
System.out.print("Back to Server: "); int dotloc = s.indexOf(".");
System.out.println(s.substring(0,dotloc)); dotloc++;
s = s.substring(dotloc); return subdns2(s);
}
else{
System.out.print("Back to Server: "); return(s);
}
}
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in); System.out.println("Enter a web address"); String ad= sc.nextLine();
String[] arrOfStr= ad.split("[.]");
System.out.println("\n------Iterative method ");
System.out.println();
System.out.println("Client's name resolver --> Root Name Server :\t"+ arrOfStr[arrOfStr.length-1]);
for (int i = arrOfStr.length-2; i >= 0; i--)
{
System.out.print("Client's name resolver --> Name Server node :\t"); System.out.println(arrOfStr[i]);
}
System.out.println("\nURL found");
System.out.println("\n\n------Recursive method \n");
dns d = new dns();
StringBuilder sb = new StringBuilder(ad); sb.reverse(); System.out.println(d.subdns(sb.toString())); System.out.println();
int dotloc = ad.indexOf("."); dotloc++;
String ad2 = ad.substring(dotloc,(ad.length()));
System.out.println(d.subdns2(ad2));
System.out.println("\nURL found");
}
}