babanin

import java.nio.ByteBuffer;

/**
 * @author Ivan Babanin ([email protected])
 */
public class StoreFloatsInDouble {
  public static void main(String[] args) {
    double pack = pack(1.1f, 1.2f);
    float[] unpack = unpack(pack);
    System.out.println(unpack[0] + "\n" + unpack[1]);

babanin

import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.RecursiveTask;

/**
 * @author Ivan Babanin ([email protected])
 */
public class TestFJP {
  public static void main(String[] args) throws InterruptedException {
    ForkJoinPool forkJoinPool = new ForkJoinPool(1);
    forkJoinPool.submit(new Task(0));

babanin

         static {
            // high value may be configured by property
            int h = 127;
            String integerCacheHighPropValue =
                sun.misc.VM.getSavedProperty("java.lang.Integer.IntegerCache.high");
            if (integerCacheHighPropValue != null) {
                int i = parseInt(integerCacheHighPropValue);
                i = Math.max(i, 127);
                // Maximum array size is Integer.MAX_VALUE
                h = Math.min(i, Integer.MAX_VALUE - (-low) -1);

babanin

    Integer x = 127;

    System.out.println(x);                  // 1
    System.out.println(127);                // 2
    System.out.println((Integer) 127);      // 3
    System.out.println(new Integer(127));   // 4

babanin

    private static class LongCache {
        private LongCache(){}

        static final Long cache[] = new Long[-(-128) + 127 + 1];

        static {
            for(int i = 0; i < cache.length; i++)
                cache[i] = new Long(i - 128);
        }
    }

babanin

    Field value = Integer.class.getDeclaredField("value");
    value.setAccessible(true);
    value.set((Integer) 127, 0);

babanin

import java.security.MessageDigest
import scala.io.Source

/**
 * Created by Ivan Babanin ([email protected]) on 4/6/2014
 */
object MD5File {
  def hash(filePath: String): String =
    MessageDigest.getInstance("MD5").digest(Source.fromFile(filePath).map(_.toByte).toArray)
      .map( 0xFF & _ )

babanin

<?xml version="1.0"  encoding="ISO-8859-1"?>
<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure.dtd">

<Configure class="org.eclipse.jetty.webapp.WebAppContext">
    <Set name="contextPath">/</Set>
    <Set name="virtualHosts">
        <Array type="java.lang.String">
            <Item>${YOUR_HOST_NAME}</Item>
            <Item>${YOUR_HOST_NAME_2}</Item>
        </Array>

babanin

package org.openjdk;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;

babanin

// Compile with "-mavx2 -std=c99 -flax-vector-conversions -O3"

#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <immintrin.h>
#include <time.h>
#include <sys/time.h>

#define TEST_ITER 10000