IntBuffer hasArray() method in Java

It can be checked if a buffer has the backing of an accessible int array by using the method hasArray() in the class java.nio.IntBuffer. This method returns true if the buffer has the backing of an accessible int array and false otherwise.

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()));
         boolean flag = buffer.hasArray();
         if (flag)
            System.out.println("The IntBuffer is backed by an array");
         else
            System.out.println("The IntBuffer is not backed by any 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]
The IntBuffer is backed by an array