Java Substring Iteration Issue

Question

I am working on a simple program that needs to return 3 times a certain substring. For example, a call such as makeThreeSubstr("hello",0,2) should return "hehehe". I have the code ready to return "he", but I don't know an simple way to output the substring three times in a row. Any help is greatly appreciated.

class Main {
 public static String makeThreeSubstr (String word, int startIndex, int endIndex)
 {
  return (word.substring(startIndex, endIndex));

 }

 public static void main(String[] args){
    System.out.println(makeThreeSubstr("hello",0,2)); //should be hehehe
    System.out.println(makeThreeSubstr("shenanigans",3,7)); //should be naninaninani
  }
}

score 4 · Accepted Answer · answered Apr 21 '17 at 02:21

4

String s = word.substring(startIndex, endIndex);
return s + s + s;

answered Apr 21 '17 at 02:21

Devendra Lattu

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This is definitely the answer I was looking for. For this specific problem, this solution works perfectly and is less cluttered than a loop. – Omar Zarbostic Apr 21 '17 at 02:26
Have a look at the link to the duplicate marked answer too. It has a similar question and users have explained it in a lot of different ways to do it. – Devendra Lattu Apr 21 '17 at 02:37

score 0 · Answer 2 · edited May 23 '17 at 12:34

0

Based on this answer Simple way to repeat a String in java

String  repeated = new String(new char[3]).replace("\0", word.substring(startIndex, endIndex));
return repeated;

edited May 23 '17 at 12:34

Community

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1

answered Apr 21 '17 at 02:25

Ray

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To whoever downvoted my answer: it would be helpful if you at least explained why. We're all just trying to learn. – Ray Apr 21 '17 at 03:26

score 0 · Answer 3 · answered Apr 21 '17 at 02:27

0

The quick and dirty way to do it is:

public static String makeThreeSubstr (String word, int startIndex, int endIndex)
{
  String substring = word.substring(startIndex, endIndex);
  return substring + substring + substring;
}

answered Apr 21 '17 at 02:27

Joey deVilla

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Java Substring Iteration Issue

3 Answers3