How can relate "block of memory" to "objects" in Java?

How can I define an object in Java in a way that would mean '开发者_运维知识库block of memory'?

Here are couple of examples:

final byte[] blockOfMemory = new byte[ 1024 ];

final java.nio.ByteBuffer blockOfMemory2 =
    java.nio.ByteBuffer.allocateDirect( 1024 );