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What is the ByteBuffer order method in Java?

Talha Ashar

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

The order method of the ByteBuffer class in Java either retrieves or modifies a buffer’s byte order, based on the parameters passed to the function.

The process is illustrated below.

To use the order method, you will need to import the ByteBuffer class into your program, as shown below.

import java.nio.ByteBuffer

Variations and parameters

There are 22 variations of the order method.

  1. The first variation of the order method has no parameters and returns a buffer’s byte order. The prototype of this method is shown below:.
public final ByteOrder order()
  1. The second variation of the order method takes a single parameter that represents a byte order. It sets this parameter as the byte order of a specified buffer. The prototype of this method is shown below.
public final ByteBuffer order(ByteOrder bo)

Return value

The order method returns either a buffer’s byte order or the buffer itself, depending on what parameters were passed to the method.

If no parameters are passed to the order method, it returns the buffer’s byte order. The byte order is used when values need to be read or written to the buffer or new buffers need to be created as views of the current buffer.

By default, the order of a ByteBuffer object is BIG_ENDIAN.

If a byte order is passed as a parameter to the order method, it modifies the byte order of the buffer and returns the buffer itself. The new byte order may be either LITTLE_ENDIAN or BIG_ENDIAN.

Example

The code below shows how the order method can be used in Java.

import java.nio.*;
import java.util.*;
class orderMethods {
public static void main(String[] args) {
// initialize buffer instance
ByteBuffer sourceBuffer = ByteBuffer.allocate(5);
byte values[] = {2, 1, 6, 7, 10};
// add values to buffer
for(int i = 0; i < 5; i++)
{
sourceBuffer.put(values[i]);
}
// Print buffer
System.out.println("The ByteBuffer is: " + Arrays.toString(sourceBuffer.array()));
// Retrieve current byte order of buffer
ByteOrder currentByteOrder = sourceBuffer.order();
System.out.println("The current byte order is: " + currentByteOrder);
// Update the byte order
ByteBuffer modifiedBuffer = sourceBuffer.order(ByteOrder.nativeOrder());
currentByteOrder = modifiedBuffer.order();
System.out.println("The modified byte order is: " + currentByteOrder);
}
}

Explanation

First, a ByteBuffer object called sourceBuffer is initialized through the allocate() method.

Since sourceBuffer has the capacity to store 55 elements, the put() method is repeatedly invoked to add values to the buffer through a for-loop.

The order method in line 2222 retrieves the byte order of the buffer. By default, the order of a ByteBuffer object is BIG_ENDIAN.

Finally, the order method in line 2626 is invoked to modify the byte order. The ByteOrder.nativeOrder() method returns the LITTLE_ENDIAN byte order. The order method creates a new buffer modifiedBuffer, and sets the byte order to LITTLE_ENDIAN.

RELATED TAGS

java
bytebuffer
communitycreator

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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