Character Extraction

• We can extract a character from a string by using index values where characters are stored in such manner which is starts with zero.

charAt( )

• To extract a character from a string we can directly refer it using this method

char charAt(int where)

• where is the index to specify where the character is specified in a String.
• It will return a character at the specified index.

getChars( )

• We can extract more than one character at a time by using this method with the following general form:

void getChars(int sourceStart, int sourceEnd, char target[ ], int targetStart)

• sourceStart specifies the index of the beginning of the substring.

• sourceEnd specifies an index that is one past the end of the desired substring.

• The array that will receive the characters is specified bytarget.

• The index within targetatwhich the substring will be copied is passed in targetStart.

getBytes( )

• _It _t stores the characters in an array of bytes.
• it uses the default character-to-byte conversions provided by the platform. The general form is:

byte[ ] getBytes( )

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

toCharArray( )

• It is used to convert all the characters in a String object into a character array.
• It returns an array of characters for the entire string with the following general form:

char[ ] toCharArray( )

public class CharacterExtraction
{
  public static void main(String args[])
{
String str="Hello World";
char ch1 = str.charAt(3);
char ch2= "Bhuvana".charAt(2);
System.out.println("charAt() method output is::"+ch1);
System.out.println("charAt() method output is::"+ch2);


int start = 2;
int end = 6;
char buf[] = new char[end - start];
str.getChars(start,end,buf,0);
System.out.println("getChars() method ouptput is::");
System.out.println(buf);

System.out.println();

byte barr[] = str.getBytes();
for(int i=0;i<str.length();i++)
  System.out.print(barr[i]);

 System.out.println();

char chararray[] = str.toCharArray();
    System.out.println(chararray);

}

}

Output:

charAt() method output is::l
charAt() method output is::u
getChars() method ouptput is::
llo

721011081081113287111114108100
Hello World