IntBuffer allocate() method in Java

A new IntBuffer can be allocated using the method allocate() in the class java.nio.IntBuffer. This method requires a single parameter i.e. the capacity of the buffer. It returns the new IntBuffer 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 {
         IntBuffer buffer = IntBuffer.allocate(5);
         buffer.put(8);
         buffer.put(1);
         buffer.put(3);
         buffer.put(7);
         buffer.put(5);
         buffer.rewind();
         System.out.println("The IntBuffer is: " + Arrays.toString(buffer.array()));
      } catch (IllegalArgumentException e) {
         System.out.println("Error!!! IllegalArgumentException");
      } catch (ReadOnlyBufferException e) {
         System.out.println("Error!!! ReadOnlyBufferException");
      }  
   }
}

The output of the above program is as follows −

Output

The IntBuffer is: [8, 1, 3, 7, 5]