NIO: check whether buffer is backed by array or not

Buffer class provides 'hasArray' method to check whether this buffer is backed up by an array or not.

Test.java

package com.sample.nio;

import java.nio.ByteBuffer;

public class Test {

 public static void main(String args[]) throws Exception {
  ByteBuffer byteBuffer1 = ByteBuffer.allocate(5);
  ByteBuffer byteBuffer2 = ByteBuffer.allocateDirect(5);

  boolean isBuffer1BackedByArray = byteBuffer1.hasArray();
  boolean isBuffer2BackedByArray = byteBuffer2.hasArray();

  System.out.println("Is byteBuffer1 backed up by array : " + isBuffer1BackedByArray);
  System.out.println("Is byteBuffer2 backed up by array : " + isBuffer2BackedByArray);

 }
}

Output

Is byteBuffer1 backed up by array : true

Is byteBuffer2 backed up by array : false

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