Java by API/java.nio/ByteOrder

ByteOrder.BIG_ENDIAN

 
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
public class Main {
  public static void main(String[] args) {
    ByteBuffer bb = ByteBuffer.wrap(new byte[12]);
    bb.asCharBuffer().put("abcdef");
    System.out.println(toString(bb.array()));
    bb.rewind();
    bb.order(ByteOrder.BIG_ENDIAN);
    bb.asCharBuffer().put("abcdef");
    System.out.println(toString(bb.array()));
    bb.rewind();
    bb.order(ByteOrder.LITTLE_ENDIAN);
    bb.asCharBuffer().put("abcdef");
    System.out.println(toString(bb.array()));
  }
  static String toString(byte[] a) {
    StringBuffer result = new StringBuffer("[");
    for (int i = 0; i < a.length; i++) {
      result.append(a[i]);
      if (i < a.length - 1)
        result.append(", ");
    }
    result.append("]");
    return result.toString();
  }
}

ByteOrder.LITTLE_ENDIAN

 
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
public class Main {
  public static void main(String[] args) {
    ByteBuffer bb = ByteBuffer.wrap(new byte[12]);
    bb.asCharBuffer().put("abcdef");
    System.out.println(toString(bb.array()));
    bb.rewind();
    bb.order(ByteOrder.BIG_ENDIAN);
    bb.asCharBuffer().put("abcdef");
    System.out.println(toString(bb.array()));
    bb.rewind();
    bb.order(ByteOrder.LITTLE_ENDIAN);
    bb.asCharBuffer().put("abcdef");
    System.out.println(toString(bb.array()));
  }
  static String toString(byte[] a) {
    StringBuffer result = new StringBuffer("[");
    for (int i = 0; i < a.length; i++) {
      result.append(a[i]);
      if (i < a.length - 1)
        result.append(", ");
    }
    result.append("]");
    return result.toString();
  }
}