CharBuffer charAt() methods in Java with Examples
The charAt() method of java.nio.CharBuffer Class is used to read the character at the given index relative to the current position.
Syntax:
public final char charAt(int index)
Parameters: This method takes the index of the character to be read, relative to the position; must be non-negative and smaller than remaining().
Return Value: This method returns the character at index position() + index.
Exception: This method throws IndexOutOfBoundsException if the preconditions on index do not hold.
Below are the examples to illustrate the charAt(int index) method:
Example 1:
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
try {
CharBuffer charbuffer
= CharBuffer.allocate( 3 );
charbuffer.append( 'a' )
.append( 'b' )
.append( 'c' )
.rewind();
System.out.println( "Original CharBuffer: "
+ Arrays.toString(
charbuffer.array()));
char value = charbuffer.charAt( 2 );
System.out.println( "\nvalue at Index 0 is : "
+ value);
}
catch (IndexOutOfBoundsException e) {
System.out.println( "\nindex is greater than"
+ " the capacity minus 1" );
System.out.println( "Exception throws : " + e);
}
}
}
|
Output:
Original CharBuffer: [a, b, c]
value at Index 0 is : c
Example 2: To demonstrate IndexOutOfBoundsException.
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
try {
CharBuffer charbuffer
= CharBuffer.allocate( 3 );
charbuffer.append( 'a' )
.append( 'b' )
.append( 'c' )
.rewind();
System.out.println( "Original CharBuffer: "
+ Arrays.toString(
charbuffer.array()));
char value = charbuffer.charAt( 3 );
System.out.println( "\nvalue at Index 0 is : "
+ value);
}
catch (IndexOutOfBoundsException e) {
System.out.println( "\nindex is greater than"
+ " the capacity minus 1" );
System.out.println( "Exception throws : " + e);
}
}
}
|
Output:
Original CharBuffer: [a, b, c]
index is greater than the capacity minus 1
Exception throws : java.lang.IndexOutOfBoundsException
Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/CharBuffer.html#charAt-int-
Last Updated :
23 Jul, 2019
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