What are the various character extraction function available in java?

Answer 1

JAVA provides a String class that provides the methods to extract the characters out of the given particular string from a String object. Now we shall discuss all the methods provided by JAVA in this blog.

charAt()To extract a particular character from the particular location from the string, charAt()method is used. General form:1char charAt(int where);

Here, where is the index of the character tobe extracted from the string. For choosing the value of where we should keep only one thing in mind that the value should be a nonnegative value. This method returns the character at that particular location.

Example:1public class exam{

2public static void main(String args[]){

3String s="abc";

4char ch;

5ch=s.charAt(2);

6System.out.println("charAt returns: "+ch);

7}

8}

Output of above code is:

getChars()getChars() is used to extract more than one characters at a time. General form:1void getChars(int sourceStart,int sourceEnd,char target[],inttargetStart);

Here,sourceStart specifies the start index of the substring, sourceEnd specifies an index that is one past the end of the desired substring. But the substring contains the characters 1 less than the actual value of sourceEnd. target[] will store the required characters. The index of the target array where the substring is to be stored is specified by the targetStart.

Example:01public class exam1{

02public static void main(String args[]){

03String s="Have a good day every one!!";

04int start=4;

05int end=11;

06char ch[]= new char[end-start];

07s.getChars(start,end,ch,0);

08System.out.println(ch);

09}

10}

Output of above code is:

getBytes()getBytes() stores the characters in an array of bytes, and it uses default character-to-byte conversions. General form:1byte[] getBytes();

It is most useful when you are a String value into an environment that does not support 16-bit Unicode characters.

toCharArray()toCharArray() is used to convert all characters in a String object into a character array. It returns an array of characters for the entire string. General Form:1char[] toCharArray();