Java Date and Time

It is a sunny day in the Twin Cities of Minneapolis and St. Paul.

Earlier today I read an article on Medium that described how bad are the crypto currencies and which actors are making money of it. I missed to bookmark the article. While writing this post, in an attempt to locate the article, I did a Google search using the following string: “medium crypto currency”. It returned several articles. I did not spend the time looking for it. That said; if you are investing on crypto currencies, perhaps it would be a good idea to read some of the articles that have reasons why you should stop doing so. That said, I have invested a few dollars on crypto currencies. My reasoning was to better understand what Bitcoin, among other crypto currencies is all about.

Today is the birthday of the wife of one of my wife brothers. We are invited later this afternoon. Hopefully the weather will hold. It is nice to attend a BBQ on a sunny day.

Today and for a few more days, I will attempt to solve some problems in HackerRank. In the past couple years I have concentrated on solving problems from LeetCode. Continue reading “Java Date and Time”

Design HashMap – 4 of 4

Today is the last Wednesday of 2020. New year 2021 will be here this Friday. My best wishes for the New Year. It seems that most of us will be receiving the COVID-19 vaccine in 2021 so we should be able to reach worldwide heard immunity. We need to learn and understand how the pandemic started and make sure we do not allow this to repeat. Millions human beings have died due to COVID-19 and the economies of the world have been severely impacted. Let’s make sure we work together to make it happen. Continue reading “Design HashMap – 4 of 4”

Design HashMap – Third approach

Good day and hopefully you had a nice long weekend.

It seems that COVID-19 vaccines have been inoculated to about two million people in the USA. Apparently the vaccine is being well received by recipients. The issue at this point seems to be able to determine the efficacy against different virus mutations and how long our bodies will maintain resistance to it. In my humble opinion these two factors will take time to determine and must be backed up the actual (non edited) and unbiased data.

My sister sent me a link to the article “History isn’t just for patriots” by Daniel Immerwahr published by The Washington Post. I enjoy reading (mostly computer science related books, papers and articles) but also enjoy reading different subjects in order to understand the world which is inhabited by humans. In general we are extremely complex and hard to understand.

Reading the article I detected a taste of political bias. If you are interested I encourage you to read the article and form your own opinion.

At some point the author makes a comparison between history and geometry, in specific to the Pythagorean Theorem. I asked my wife when was the last time she recalls using it, if any, and for what purpose. She had no recollection of ever using it outside the geometry class while attending middle school. On the other hand, I use it often due that I design and develop software and have interest in algorithms and data structures among other computer science subjects.

On the other hand, we both have read several history books from different countries and at different times. To me unbiased history, which is very hard to find, provides facts that we can process and formulate an idea of what had happened in a certain part of the world during a specific period in time. With that information I hope to be able to better understand opinions from others. It is a fact that the winners write history.

Now a day we have a different type of influence. It comes in different forms and sources. For example I read the article in question that was published by The Washington Post and was sent to me by my sister who currently is living and teaching in China. After understanding the sources I need to read the article in an unbiased manner attempting to understand the set of points the author is providing and to understand the logic behind them. I have made my opinion and hopefully if you have a chance to read the article, you will also be able to generate your own educated opinion. Continue reading “Design HashMap – Third approach”

Design HashMap – Second approach

Today is Christmas Eve Day 2020 and we woke up with -3 F. In addition snow and wind started yesterday afternoon. Looks like a perfect day to stay in and roast a turkey.

As a matter of fact, my wife and I prepared the turkey early this morning and put it in the oven. The raw turkey came in at 24 lbs. It had giblets and a bag of liquid for basting. We disposed of those items. Next time we roast a turkey will get a smaller one (about 11 lbs.) and from a different brand (not Jennie-O). The breast of this turkey is not in proportion to the weight. Will see how the sandwiches on ciabatta bread turned out later this afternoon. Continue reading “Design HashMap – Second approach”

Design HashMap

It seems like I lost track of time this week. It is early morning on Wednesday December 23, 2020 and the weather forecast calls for 8 inches of fresh snow and a low of -1 F. This would be the first time this season that we experience subzero temperatures in the city where I live.

We always should look at the positive side of things. With the snow less people will be out and about which is good for restraining new COVID-19 infections. In addition, the days are starting to get longer. We will not be able to notice it for a few weeks, but it is happening.

I brought in from the refrigerator we keep in the garage, a 24 lbs. turkey, which we will roast tomorrow morning and will consume it mostly as sandwiches. Given that it will be my wife and I consuming this bird, it will last for several weeks. We will freeze most of it and consume it as needed. Continue reading “Design HashMap”

Java Functional Programming – 2 of n

Today I woke up a little earlier than usual. I have my alarm set for 06:00 AM, but I was up around 04:45 AM. Read for a while, prepared breakfast and woke up my wife. After breakfast showered and was in my home office by 06:00 AM. I typically work in 2-hour blocks. Break for about 15 minutes and then repeat. For lunch I break for about an hour depending if I need to help my wife with lunch. Typically I help grilling on the deck, but the temperature has dropped and there is snow so I think there will be no more outdoor cooking until next spring.

I have a lot of things planned for the workday. Hopefully I will be able to get most of them done by 06:00 PM. Continue reading “Java Functional Programming – 2 of n”

Java Functional Programming – 1 of n

It is not a nice day in the Twin Cities of Minneapolis and St. Paul. It has been raining and snowing on and off all day. I assume the roads are somewhat slippery. The good thing is that we do not have to go anywhere this evening.

One of my goals is to continue learning and experimenting with Java. Experience has taught me that at work one tends to use a limited feature set of the programming language(s) you use. This is why on my own time I like to learn different programming languages and different features so when I design and develop software, I can be quite productive.

We all know that not all languages have the same syntax or features, but with time, most object oriented languages tend to add similar features (not to say the same) with a different name and syntax. That is why I also like to solve problems that require algorithms. Once you have the idea, it does not take too much to implement the algorithm in a different language. This seems to be the trend while developing microservices. The idea is to use the best language for a task. Continue reading “Java Functional Programming – 1 of n”

Java Streams and LocalDate

It is Monday November 09, 2020 and it has been a week since the Election Day and the tally of votes is still being adjusted. What a disaster for the USA and friends.

I am not sure why we are not using a voter ID card and limiting voting in person at the polls on Election Day. No exceptions! I am not implying the obvious, but the changes made to the electoral system this year was an open invitation for fraud. Not sure which part of our government is responsible for making sure elections are legal and trustworthy.

If you disagree with the voter ID card and a secure electronic vote at polling sites I would like to provide you with some facts (not opinions) which seem to be all over the news and social media. When you get a credit card via USPS, for your protection, you are asked to call a toll free number and answer a few questions which would allow the credit company to enable the card so you can start charging on it. Credit card companies / banks do not trust the USPS with money. Continue reading “Java Streams and LocalDate”

Dates in Java

Today I woke up around 05:00 AM. Later this morning my wife has a lab appointment at 08:15 AM. I decided to get up, cancel my 06:00 AM alarm, and set a new alarm for 07:15 AM. That should give us ample time to get ready and drive to the appointment. Will have breakfast when we get back because she needs to fast for the blood test.

Not sure what is going on with the Presidential Election 2020 results. As I have mentioned in a previous post, the entire process is open to fraud. Do not understand how in the USA we do not use a voter ID card. In addition we should have a secure system in which voters go to their designated polling sites and vote electronically. A paper receipt can be used by voters to make sure the ballot is counted and has not been tampered with. Election Day should be the only day one can vote. If you miss it because it is not important to you, so you can wait four years and plan accordingly. Continue reading “Dates in Java”

Concurrent Skip List Map

Before we start I would like to thanks all of you that have subscribed to my blog. We have reached 2,000 subscribers!!! As a matter of fact, we currently have 2,150 subscribers. Thanks a lot!!!

It is so hard to find real news not politically opinionated. For example, I ran into an article that discussed the AztraZeneca vaccine trial in the UK. Apparently there have been two cases in which people that received the vaccine got severely ill. In both cases the trial stopped until further investigation. In both cases it was determined that the issue was not associated with the vaccine. The trials continued in the UK. Continue reading “Concurrent Skip List Map”