Substring help

**Roach** · September 20th, 2010, 10:35 PM

Hello to all... this is my first post on the forum, and I'm sure I'll stick around for extra help

Anyways. I'm practicing on CodingBat.com and got stuck on this task: CodingBat Java String-1 nTwice

Here's my code:

public String nTwice(String str, int n) 
{
  String a = str.substring(0,n);
  String b = str.substring();
  String c = a+b;
  return c;
}

I THINK that my method will work, but I am unsure about how to define String b so that the program does what it is intended to do. What should go between the parentheses?

**copeg** · September 20th, 2010, 11:07 PM

Read the API for String , more specifically the length method.

**aussiemcgr** · September 21st, 2010, 07:57 AM

Have a look at one of the substring methods. There is one with 1 parameter instead of two.

This method will get the String:
Starting from the the parameter index value AND
Getting the rest of the String.

So, while this method:

String test = "test";
String sub = test.substring(0,2);

will set sub to be te,
This method:

String test = "test";
String sub = test.substring(1);

will set sub to be est.

Does that make sense?

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