Hello guys, if you are wondering how to use LocalDate, LocalTime, and LocalDateTime classes from Java's new Date and Time API then you have come to the right place. Earlier, I have shared best Java 8 courses, books, and Java 8 interview questions and in this article, I Am going to share common examples of LocalDateTime, LocalDate, and LocalTime class in Java. It's been many years since Java SE 8 was released and Java 8 adoption has come a long way. Java programmers around the world have accepted with both ends, many companies have switched their development on Java 8 and several others are migrating to Java 8 platform.
3 Examples to Convert Date to LocalDate in Java 8? Tutorial
One of the great features of Java 8 is the new Date and Time API which is intended to fix existing issues related to mutability and thread-safety with existing java.util.Date class. But given java.util.Date is used very heavily across all the Java applications, you will often end up with a situation where you need to convert java.uti.Date to java.time.LocalDate while working in Java 8. Unfortunately there is no toLocalDate() method in the java.util.Date class. Though, you can easily convert Date to LocalDate if you are familiar with how new and old API classes map to each other.
How to Convert Date to LocalDate in Java 8 - Example Tutorial
Hello guys, if you want to learn how to convert old Date to new LocalDate in Java 8 then you have come to the right place. Earlier, I have shared 10 examples of LocalDate in Java 8, and in this article, I am going to teach you how to convert Date to LocalDate in Java. you may know that JDK 8 introduced the new Date and Time API, which has got a new set of shiny date classes like LocalDate, LocalTime, etc, but you still have a lot of code written against java.util.Date? In order to work with that code, you should know how to convert java.util.Date to java.util.LocalDate in Java.
How to convert String to Date in Java? Example Tutorial
Hello guys, if you are wondering how to convert a String to Date object in Java then you have come to the right place. Data type conversion is one of the most common tasks in programming and every Java programmer must know how to convert one type to another type. There are many times when you will be required to convert a String to LocalDate or java.util.Date object mostly in a different format like dd-MM-yy or yyyy-MM-dd or simply yyyy MM dd. For example, clients pass dates as String to the Server or sometimes we read Date related data from CSV file. Java provides API for parsing String to date using DateFormat class, though Java's Date and Time API is severely criticized, it is also the most used Date and Time format solution.
How to convert Date to LocalDateTime in Java 8 - Example Tutorial
The LocalDateTime class has been introduced in Java 8 to represent both date and time values. It's local, so date and time are always in your local time zone. Since the java.util.Date has been widely used everywhere in many Java applications, you will often find yourself converting java.util.Date to LocalDate, LocalTime, and LocalDateTime classes of the java.time package. Earlier I have shown you how to convert Date to LocalDate and today, I am going to teach you how to convert Date to LocalDateTime in Java 8. The approach is the same. Since the equivalent class of java.util.Date in new Date and Time API in java.time.Instant, we first convert Date to Instance and then create LocalDateTime instance from that Instant using System's default timezone.
10 Examples to DateTimeFormatter in Java 8 to Parse, Format LocalDate and LocalTime
Parsing and formatting dates are other essential topics while working with date and time in Java. Even though the old Date API had the SimpleDateFormat and DateFormat class to support the formatting of date and parsing texts, they were not simple, or should I say there were just simple in writing the wrong code. You might know that SimpleDateFormat was not thread-safe and quite heavy to be used as a local variable. Thankfully, this has been sorted now with a new LocalDateTime class and DateTimeFormatter class, which has several inbuilt formats.
How to Format Date to String in Java 8 [Example Tutorial]
One of the common programming tasks in Java is to change the date format of a given Date or String. For example, you have something like "2017-01-18 20:10:00" and you want to convert it that date into "2017-01-18", or you want to convert from dd-MM-YY to MM-dd-YY or to any other format of your choice and need, but a valid date format as per Java specification. How will you do that? Well, it's not that difficult. It's just a two-step process. In the first step, you need to parse String to create an equivalent date using the current format, and then once you got the date, you need to again convert it back to String using the new format. The same process is repeated in both Java 8 and before, only corresponding API and class changes.
How to Convert java.util.Date to LocalDate in Java 8 - Example Tutorial
Hello guys, once you move to Java 8, you will often find yourself working between old and new Date and Time API, as not all the libraries and systems you interact with will be using Java 8. One of the common tasks which arise from this situation is converting old Date to new LocalDate and that's what you will learn in this tutorial. There seems to be a couple of ways to convert a java.util.Date to java.time.LocalDate in Java 8, but which one is the best way? We'll figure it out in this article, but first, let's explore these different ways to convert a java.util.Date object to LocalDate in Java 8 code.
How to parse String to LocalDate in Java 8 - DateTimeFormatter Example
From Java 8 onward, you are no longer dependent on the buggy and bulky SimpleDateFormat class to parse and format date Strings into real Date objects in Java e.g. java.util.Date. You can use the DateTimeFormatter class from java.time package for all your formatting and parsing need. You are also no longer required to use another buggy class java.util.Date if you are doing fresh development, but if you have to support legacy code then you can also easily convert LocalDate and LocalTime to java.util.Date or java.sql.Date. In this tutorial, we will learn about both parsing String to date in Java and formatting Date into String.
How to Convert String to LocalDateTime in Java 8 - Example Tutorial
Hello guys, today, I will talk about a common problem while working in a Java application, yes you guessed it right, I am talking about String to Date conversion in Java. I had discussed this before (see the Date to String) when Java 8 was not out, but with Java 8, I don't see any reason to use old date and time API, and hence I am writing this post to teach you how to convert String to Date in Java 8 or beyond. Suppose you have a date-time String "2016-03-04: 11:01:20" and you want to convert this into a LocalDateTime object of Java 8 new date and time API, how do you do that? Well, if you have worked previously with String and Date then you know that you can parse String to Date in Java.
How to Calculate Next Date and Year in Java? LocalDate and MonthDay Example Tutorial
Hello guys, if you are wondering how to calculate the next premium date, next birthday, or exact date for the next Christmas holiday in Java then you have come to the right place. Earlier, I have shared 20+ examples of Date and Time in Java, and in this article, I will show you how you can use the LocalDate and MonthDay class from the new Java 8 Date and Time package to calculate the next or previous date in Java. This new API is very well structured and you have classes to represent different Date concepts, for example, you can use LocalDate to represent a Date without time components like the next premium date or employee joining date or birth date.
How to find difference between two dates in Java 8? Example Tutorial
One of the most common programming task while working with date and time objects are calculating the difference between dates and finding a number of days, months, or years between two dates. You can use the Calendar class in Java to get days, months between two dates. The easiest way to calculate the difference between two dates is by calculating milliseconds between them by converting java.util.Date to milliseconds using the getTime() method. The catch is converting those milliseconds into Days, Months and Year is not tricky due to leap years, the different number of days in months, and daylight saving times.
How to get current Day, Month, Year from Date in Java? LocalDate vs java.util.Date Example
In this article, I'll show you how to get the current day, month, year, and dayOfWeek in Java 8 and earlier version like Java 6 and JDK 1.7. Prior to Java 8, you can use the Calendar class to get the various attribute from java.util.Date in Java. The Calendar class provides a get() method which accepts an integer field corresponding to the attribute you want to extract and return the value of the field from the given Date, as shown here. You might be wondering, why not use the getMonth() and getYear() method of java.util.Date itself, well, they are deprecated and can be removed in the future version, hence it is not advised to use them.
How to convert Timestamp to Date in Java?JDBC Example Tutorial
In the last article, I have shown you how to convert Date to Timestamp in Java and today we'll learn about converting timestamp value from database to Date in Java. As you remember, the JDBC API uses separate Date, Time, and Timestamp classes to confirm DATE, TIME, and DATETIME data type from the database, but most of the Java object-oriented code is written in java.util.Date. This means you need to know how to convert the timestamp to date and vice-versa. You can do by using the getTime() method, which returns the number of millisecond from Epoch value.
Difference between ServletConfig and ServletContext in JSP Servlet? Answer
Difference
between ServletConfig
and
ServletContext
ServletContext and ServletConfig these two
are the important interface of Servlet API which is used by Java J2EE programmer
during web application development. Correct understanding of What is ServletContext and ServletConfig is very
important for any J2EE application developer. Apart from that Difference
between ServletContext and ServletConfig are a popular
Servlet JSP interview questions and mostly asked on both fresher and
experienced Java programmer during J2EE interviews.
How to create and initialize List or ArrayList in one line in Java? Example
creating and initializing List at the same time
Sometimes we want to create and initialize a List like ArrayList or LinkedList in one
line much like creating an array and initializing it on the same line. If you look at The array on Java programming language you can create and initialize both primitive
and object arrays e.g. String
array very easily in just one line but in order to create a List
equivalent of that array, you need to type a lot of code. This is also one of the
tricky
Java question sometimes appears in Interview as Write Java code to create and initialize ArrayList in the same line.
Difference between include directive, include action and JSTL import tag in JSP? Answer
There are three main ways to include the content of one JSP into another:
include directive
JSP include action
and JSTL import tag
The include directive provides static inclusion. It adds the content of the resource specified by its file attribute, which could be HTML, JSP, or any other resource at translation time.
Any change you make in the file to be included after JSP is translated will not be picked up by the include directive.
include directive
JSP include action
and JSTL import tag
The include directive provides static inclusion. It adds the content of the resource specified by its file attribute, which could be HTML, JSP, or any other resource at translation time.
Any change you make in the file to be included after JSP is translated will not be picked up by the include directive.
Difference between UNION vs UNION ALL in SQL? Example
Hello guys, what is the difference between UNION vs UNION ALL is one of the
most popular SQL interview questions and often asked programmers during a
telephonic round of interviews. Though both UNION and UNION ALL is used to
combine results of two SELECT queries, the main difference between them is
that UNION doesn't include duplicate record but UNION ALL does.
Another difference between them is that UNION ALL is faster than UNION but may
look slow because it returns more data which takes more time to travel via the
network. The difference between UNION and UNION ALL can be a tricky SQL question, especially for developers, who have not used this useful keyword
ever.
Can you join two unrelated tables in SQL? Cross Join Example
In one of the recent programming job interviews, one of my readers was asked the question, how do you join two tables which are not related to each other? i.e. they don't have any common column? is it possible in SQL? My reader got confused because he only knows about INNER join and OUTER join which require a key column like dept_id which is the primary key in one table like Department and foreign key in another table like Employee. He couldn't answer the question, though he did tell them about you can select data from multiple tables by typing multiple table names in from clause using a comma.
Difference between Primary key vs Candidate Key in SQL Database? Example
Primary key vs Candidate Key
What is the difference between primary key and candidate key is another popular SQL and database interview question which appears in various programming interviews now and then? The concept of primary key and candidate key is not just important from the interview point of view but also in designing databases and normalization. By the way, this is my second post about primary keys, In the last one, we have seen a comparison of primary key vs unique key, which also happens to be one of the frequently asked database questions.
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