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Home » Java » Array » Conversion between Strings and Arrays
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Conversion between Strings and Arrays

By Dinesh Thakur

As we know that strings are not arrays so the String class also provides methods to convert a string to an array of characters and vice versa. These include

toCharArray();

getChars();

valueOf();

char [] toCharArray (): This method converts the invoking string to an array of individual characters. For example : The statement,

char[] ch = sl.toCharArray();

will convert the string Welcome which is referenced by sl to an array of characters such that ch [0] contains ‘W’, ch [1] contains ‘e’ and so on.

void getChars(int srcBegin, int srcEnd, chsr[] dest, int destBegin): This method copies a substring of the invoking string from index srcBegin to index srcEnd-1 into a character array dest starting from index destBegin. For example: The statement,

char[] txtArray = new char[3];

sl.getChars(3,6,txtArray,O);

will copy characters from the String object slat index position 3 to 5 (i.e. 6 – 1) inclusive, so txtArray[0] will be ‘c’, txtArray[1] will be ‘0’ and txtArray[2] will be ‘m’.

static String valueOf (char [] ch): This method will covert an array of characters to a string. For example : The statements,

char[] ch = {‘W’, ‘E’, ‘L’, ‘C’, ‘0’, ‘M’, ‘E’};

String str String.valueOf(ch);

will return the string Welcome from a character array ch and store the reference in str. There are several versions of valueOf () method that can be used to convert a character and numeric values to strings with different parameter types including in t, long, float, double and char.

Now let us consider a example to show how these work.

public class ConversionMethods 
{
         public static void main(String[] args)
      {
       
          String s1 = "Welcome" ;
          char[] txtArray = new char[3];
          char [] ch = s1.toCharArray();
          for( int i =0; i<ch.length; i++)
               System.out.println("ch["+i+"] = " +ch[i]);
               s1.getChars(3,6,txtArray,0);
               for( int i=0;i<txtArray.length;i++)
                    System.out.println("txtArray["+i+"] = "+txtArray[i]);
                    char[] c = {'W','E','L','C','O','M','E'};
                    String str = String.valueOf(ch);
                    System.out.println("str = " + str);
      }
}

Conversion between Strings and Arrays

You’ll also like:

  1. Arrays of Strings in C
  2. Difference Between Strings and Character Arrays
  3. Arrays Of Arrays with Varying Length in Java
  4. Searching Strings in Java Examples
  5. Getting String Length, Characters and Concat Strings in Java
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About Dinesh Thakur
Dinesh ThakurDinesh Thakur holds an B.C.A, MCDBA, MCSD certifications. Dinesh authors the hugely popular Computer Notes blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps.

Dinesh Thakur is a Freelance Writer who helps different clients from all over the globe. Dinesh has written over 500+ blogs, 30+ eBooks, and 10000+ Posts for all types of clients.


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