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  this keyword in Lambda expression in Java 8

Since the release of Java 8, people are excited to see a big feature added to this language which is existing in other languages for a long time -- Lambda expression. The introduction of lambda expression in Java 8 gives people an easy way or a vertical to horizontal way to solve problems. There are many posts on the Internet which shows how to use lambda expression in Java, such as Lambda Quick Start and Java 8 Lambda Expressions Tutorial with Examples. In this post, we will only focus on the t...

   THIS,LAMBDA EXPRESSION,JAVA 8     2014-06-01 03:57:05

  C++ and Java over Python in Google products

In Google, most of the products are written in C++ and Java. They usually don't choose Python to write their product stack. What's behind the decision to choose one language over the other in Google? Let's get to read some opinions from Robert Love, a Google software engineer. Love said he couldn't imagine writing let alone maintaining a large software stack in Python. They use C++, Go, and Java for production software systems, with Python employed for scripting, testing, and tooling.There are a...

   Java,Python,Google     2014-07-20 04:39:09

  Why Small Businesses Need Payroll System

Small businesses are scattered everywhere. The competition is soaring high. One of the ways to ensure the success of an organization is to hire the right talent and ensuring their retention.  Errors in payroll calculation can act as one of the major factors for employees to decide whether they should stay with your organization or not. The more errors, the more chances of them leaving. Errors can frustrate employees and further lower their morale.  Thus, it is crucial for you to unders...

   SMALL BUSINESS,PAYROLL SYSTEM     2021-03-08 05:35:49

  Google Nexus Event Live

Google is going to have new Nexus product release at 12 o'clock 30th September(Beijing time). This new Nexus will ship with the latest Android 6.0 Marshmallow system from Google.  Here is the live stream from YouTube. Two Nexus phones are expected to be unveiled tonight. They are from LG and Huawei respectively.. The Nexus 6P is Huawei's first Nexus device and will be available for pre-order on Tuesday in the U.S., U.K., Ireland, Canada and Japan starting at $499.99 and the devic...

   LIVE,ANDROID 6.0,NEXUS,GOOGLE     2015-09-29 10:57:04

  About tmpfs

tmpfs is another confusing name in Linux kernel, its implementation is in mm/shmem.c, shmem has no relation to tmpfs at first glance although we know tmpfs is based on memory. We can understand why we use this name by seeing where this is used. In a desktop Linux system, tmpfs is loaded usually: % grep tmpfs /proc/mountsdevtmpfs /dev devtmpfs rw,seclabel,nosuid,relatime,size=1958956k,nr_inodes=489739,mode=755 0 0tmpfs /dev/shm tmpfs rw,seclabel,nosuid,nodev,relatime 0 0tmpfs /run tmpfs rw,seclab...

   tmpfs,Linux,file system     2013-06-14 12:10:56

  Your Code is My Hell

It occurred to me recently that my experience as a Rails developer may be somewhat unique.I often get brought in to help preexisting Ruby/Rails projects evolve and mature in a sustainable way. As a result, the vast majority of Ruby projects I’ve worked on have been well-established by the time I arrived. In fact, offhand I can only think of one commercial greenfield Ruby project I’ve participated in. All the rest have been “legacy” from my perspective, in the ...

   Code style,Clean code,Code paradigm     2011-09-15 08:39:16

  Simple explanation about process and thread

Process and thread are two basic concepts of operating system, but they are a bit abstract which cannot be  mastered easily. There is an analogy which explains these concepts very well. 1. The kernel of the computer is CPU, it handles all the computing tasks, it's like a factory and will run all the time. 2. Assume there is power limitation for the factory, it can only supply to one unit once,i.e, when one unit is working, other units must stop and wait. The meaning behind this is that eac...

   Process,Thread,CPU,Operating system     2013-04-24 11:33:10

  What is good design?

Some quotes about good design from a Germany designer Dieter Rams in documentary "Objectified": Good design should be innovative Good design should make a product useful Good design is aesthetic design Good design will make a product understandable Good design is honest Good design is unobtrusive Good design is long-lived Good design is consistent in every detail Good design is environmentally friendly Good design is as little design as possible This brings up a question -- what...

   METRO,SIMPLICITY,GOOD DESIGN,PRINCIOPLE,UNIX PHILOSOPHY     2012-05-09 06:48:11

  Smuggling data in pointers

While reading up on The ABA Problem I came across a fantastic hack.  The ABA problem, in a nutshell, results from the inability to atomically access both a pointer and a "marked" bit at the same time (read the wikipedia page).  One fun, but very hackish solution is to "smuggle" data in a pointer.  Example:#include "stdio.h"void * smuggle(void * ptr, int value){  return (void *)( (long long)ptr | (value & 3) );}int recoverData(void * ptr){  return (long long)ptr &...

   C,Pointer,Bit,Data,Atomic,Smuggle     2011-11-14 08:15:59

  Generate certificate in Java -- Store certificate in KeyStore

In previous post, we have explained how to create a certificate chain in Java. After generating the chain, we need to store it somewhere so that it can be used later when we are doing the actual SSL communication, either in a key store or trust store. This post will show you how to store the private key and its associated certificate chain in a keystore file. There are different types of keystore in Java, in this post, we will choose the JKS to demonstrate how to store the certificate chain. Whe...

   Java,Certificate chain,Keystore     2014-08-20 03:56:39

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