ChangeBase.java

public class ChangeBase {
  public static void main(String[] args) {
    short[][] shorts = { { 0x00, 0x28 }, { 0x10, 0x28 }, { 0x1F, 0x9C } };
    int iterations = 102533960;

    long start = System.nanoTime();
    for (int i = 0; i < iterations; i++) {
      for (short[] s : shorts) {
        convertToIntegerUsingStringManipulation(s);
      }
    }
    long durationS = System.nanoTime() - start;

    start = System.nanoTime();
    for (int i = 0; i < iterations; i++) {
      for (short[] s : shorts) {
        convertToIntegerUsingBitManipulation(s);
      }
    }
    long durationB = System.nanoTime() - start;

    System.out.println("durationS: " + durationS / 1000000000.0);
    System.out.println("durationB: " + durationB / 1000000000.0);
    System.out.println("durationS / durationB: " + (durationS / durationB));
  }

  private static int convertToIntegerUsingBitManipulation(short[] shorts) {
    return (shorts[0] << 8 | shorts[1] & 0xFF);
  }

  private static int convertToIntegerUsingStringManipulation(short[] shorts) {
    return Integer.parseInt(
        Integer.toBinaryString(shorts[0]) + String.format("%8s",
          Integer.toBinaryString(shorts[1])).replace(' ', '0'), 2);
  }
}

durationS: 274.23779
durationB: 1.255262
durationS / durationB: 218