convert a string into a character array

Question

I have converted a String input into a character array by using toCharArray. Now I want to do the same thing without using toCharArray. How can I do it?

import java.util.*;
public class cArray{

public static void main(String[]args){

Scanner input = new Scanner(System.in);

    System.out.println("Please Give A String");
    String s1 = input.nextLine();
    char[]data = s1.toCharArray();
  }

}

why would you want to do that...??? if you so interested in re-inventing the wheel....write a new language too!! :D — NoobEditor
– NoobEditor, Commented Jul 17, 2014 at 10:55
@NoobEditor There is nothing wrong with wanting to know what goes on under the hood. How will developers learn core skills otherwise? — JamesB
– JamesB, Commented Jul 17, 2014 at 10:59
@JamesB : agreed....there is nothing wrong in that but what OP asked was easy enough to google too and he would have learnt a lot about some other stuffs too while googling....asking on SO simply shows no effort was done finding it first as the same is easily available online....!! — NoobEditor
– NoobEditor, Commented Jul 17, 2014 at 11:02
Most IDEs come with the java library source code. Just debug through toCharArray and see how it's coded. And check the JLS to see the degree of standardisation to that an implementation must conform. You also learn to use a debugger and to follow a software spec: the most important skills of all. — Bathsheba
– Bathsheba, Commented Jul 17, 2014 at 11:04
@NoobEditor Ah but that isn't how you replied. You didn't say show some effort did you? — JamesB
– JamesB, Commented Jul 17, 2014 at 11:05

Suresh Atta · Accepted Answer · 2014-07-17 10:57:07Z

5

You can do that by building a new char array

   String s1="test";
   char[] carr=new char[s1.length()];
   for (int i=0;i<s1.length();i++){
       carr[i]=s1.charAt(i);
   }

Don't tell us that , I don't want to use charAt also ;)

answered Jul 17, 2014 at 10:57

Suresh Atta

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1 Comment

luiscosta Over a year ago

+1 because this is the correct answer and also the correct humor.

Syam S · Accepted Answer · 2014-07-17 11:02:04Z

1

Alternatively you can do like

public char[] toCharArray(String str) {
    char result[] = new char[str.length()];
    System.arraycopy(str, 0, result, 0, str.length);
    return result;
}

PS : This is what Java does inside toCharArray() method.. ;)

answered Jul 17, 2014 at 11:02

Syam S

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Comments

Kuntal-G · Accepted Answer · 2014-07-17 11:08:45Z

0

Why not write a little method yourself

public char[] toCharacterArray( String s ) {

   char[] array = new char[s.length()];
   for (int i = 0; i < s.length(); i++) {
      array[i] = s.charAt(i);
   }

   return array;
}

Now you decide which one you use toCharArray method or chartAt() as mentioned above with your own looping.

edited Jul 17, 2014 at 11:08

answered Jul 17, 2014 at 11:03

Kuntal-G

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2 Comments

HectorLector Over a year ago

Just out of curiosity: why would you want to use Character[] instead of char[] in this case?

NoobEditor Over a year ago

no return type of method defined but you still able to return null and an array...2 different types...just curious!!

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