# CharBuffer allocate() method in Java

Java 8ProgrammingObject Oriented Programming

A new CharBuffer can be allocated using the method allocate() in the class java.nio.CharBuffer. This method requires a single parameter i.e. the capacity of the buffer. It returns the new CharBuffer that is allocated. If the capacity provided is negative, then the IllegalArgumentException is thrown.

A program that demonstrates this is given as follows −

## Example

Live Demo

import java.nio.*;
import java.util.*;
public class Demo {
public static void main(String[] args) {
int n = 5;
try {
CharBuffer buffer = CharBuffer.allocate(n);
buffer.put('A');
buffer.put('P');
buffer.put('P');
buffer.put('L');
buffer.put('E');
buffer.rewind();
System.out.println("The CharBuffer is: " + Arrays.toString(buffer.array()));
} catch (IllegalArgumentException e) {
System.out.println("Error!!! IllegalArgumentException");
}
The CharBuffer is: [A, P, P, L, E]