StringPerformanceTest (String to bytes)

gistfile1.txt

package test;

import java.nio.charset.Charset;

import org.junit.Test;

public class StringPerformanceTest {

  @Test
  public void stringToBytes() throws Exception {
    for (int i = 0; i < 10; i++) {
      stringToBytes(10000000);
    }
  }

  public void stringToBytes(final int count) throws Exception {
    long start, end;
    String data = "MyData";
    Charset utf8 = Charset.forName("utf-8");
    byte[] tmp = new byte[16];

    for (int i = 0; i < 10; i++) {
      for (int j = 0; j < 10; j++) {
        data.getBytes();
      }
      Thread.sleep(100);
    }

    start = System.currentTimeMillis();
    for (int j = 0; j < count; j++) {
      data.getBytes();
    }
    end = System.currentTimeMillis();
    System.out.format("(unicode) duration: %d ms, ratio: %.4f", end - start, count / ((end - start) / 1000.0));
    System.out.println();

    for (int i = 0; i < 10; i++) {
      for (int j = 0; j < 10; j++) {
        data.getBytes(utf8);
      }
      Thread.sleep(100);
    }

    start = System.currentTimeMillis();
    for (int j = 0; j < count; j++) {
      data.getBytes(utf8);
    }
    end = System.currentTimeMillis();
    System.out.format("(utf-8) duration: %d ms, ratio: %.4f", end - start, count / ((end - start) / 1000.0));
    System.out.println();

    for (int i = 0; i < 10; i++) {
      for (int j = 0; j < 10; j++) {
        stringToBytesLoop(data, tmp);
      }
      Thread.sleep(100);
    }

    start = System.currentTimeMillis();
    for (int j = 0; j < count; j++) {
      stringToBytesLoop(data, tmp);
    }
    end = System.currentTimeMillis();
    System.out.format("(loop) duration: %d ms, ratio: %.4f", end - start, count / ((end - start) / 1000.0));
    System.out.println();
  }

  void stringToBytesLoop(final String source, final byte[] dest) {
    for (int i = 0; i < source.length(); i++) {
      dest[i] = (byte) source.charAt(i);
    }
  }

}