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HOW TO CONVERT STRING TO LONG IN JAVA? EXAMPLE

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Advertisement







You can parse a String literal containing valid long value into a long primitive
type using parseLong() and valueOf() method of java.lang.Long class of JDK.
Though there is a couple of difference between valueOf() and parseLong() method
e.g. valueOf() method return a Long object while parseLong() method return a
Long object, but given we have autoboxing in Java, both method can use for
parsing String to create long values. In the last article, you have learned how
to convert a Long value to a String in Java, and in this tutorial, you will
learn the opposite, i.e. how to parse a String to a long value in Java. 

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Labels: core java, String



HOW TO CONVERT STRING TO DOUBLE IN JAVA AND DOUBLE TO STRING WITH EXAMPLE


There are three ways to convert a String to double value in Java,
Double.parseDouble() method, Double.valueOf() method and by using new Double()
constructor and then storing the resulting object into a primitive double field,
autoboxing in Java will convert a Double object to the double primitive in no
time. Out of all these methods, the core method is parseDouble() which is
specially designed to parse a String containing floating-point value into the
Double object. Rest of the methods like valueOf() and constructor uses
parseDouble() internally. This method will throw NullPointerException if the
string you are passing is null and NumberFormatException if String is not
containing a valid double value e.g. containing alphabetic characters.


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Labels: core java, String



HOW TO CHECK IF TWO STRING VARIABLES ARE SAME IN JAVA? EQUALS(),
EQUALSIGNORECASE() AND == OPERATOR EXAMPLE


There are multiple ways to compare two strings alphabetically in Java e.g. ==
operator, equals() method or compareTo() method, but which one is the best way
to check if two strings are equal or not? Programmers often confused between ==
operator and equals() method, and think that comparing strings using == operator
should be faster than equals() method, and end up using that. Though they are
not completely wrong, they often missed the point that == operator is designed
to compare object equality, not String equality, which is actually defined in
equals()method and compare Strings alphabetically. 

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Labels: coding, core java, programming, String



ARRAYLIST.CONTAINS(), SIZE(), CLEAR, ASLIST(), SUBLIST(), TOARRAY(), AND
ISEMPTY() EXAMPLE IN JAVA



Java ArrayList Example
ArrayList in Java is one of the most popular Collection classes. ArrayList is an
implementation of the List interface via AbstractList abstract class and
provides an ordered and an index-based way to store elements. Java ArrayList is
analogous to an array, which is also index-based. In fact, ArrayList in Java is
internally backed by an array, which allows them to get constant time
performance for retrieving elements by index. Since an array is fixed length and
you can not change their size, once created, Programmers, starts using
ArrayList, when they need a dynamic way to store object, i.e. which can re-size
itself. See the difference between Array and List for more differences. 

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Labels: ArrayList, core java, Java collection tutorial



HOW TO READ USER INPUT AND PASSWORD IN JAVA FROM COMMAND LINE? CONSOLE EXAMPLE


Hello guys, if you are wondering how to take user input from command prompt in
Java like username and password then don't worry. Java provides several
utilities like Scanner and BufferedReader to read input from command prompt in
Java. Java 6 added a new utility class for reading input data from character
based devices including command line. java.io.Console can be used to read input
from command line, but unfortunately, it doesn't work on most of the IDE like
Eclipse and Netbeans. As per Javadoc call to System.Console() will return
attached console to JVM if it has been started interactive command prompt or it
will return null if JVM has been started using a background process or scheduler
job.

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Labels: core java, java io tutorial



HOW TO REPLACE CHARACTERS AND SUBSTRING IN JAVA? STRING.REPLACE(), REPLACEALL()
AND REPLACEFIRST() EXAMPLE


One of the common programming tasks is to replace characters or substring from a
String object in Java. For example, you have a String "internet" and you want to
replace the letter "i" with the letter "b", how do you that? Well, the String
class in Java provides several methods to replace characters, CharSequence, and
substring from a String in Java. You can call replace method on the String,
where you want to replace characters and it will return a result where
characters are replaced. What is the most important point to remember is that
the result object would be a new String object? 

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Labels: core java, String



WHERE IS PYTHON USED IN THE REAL WORLD?



Hello guys, if you are wondering where is Python used in real world before you
decide whether to learn Python programming language or not then its actually a
good question. While everyone is talking about Python's popularity, it make
sense to do research and find out which industries in Software development is
using Python as their primary language. You will be surprised to know that like
Java Python is also almost everywhere. Python is now used in Artificial
Intelligence, Web Development, Game Development, Building Desktop and UI Apps,
Machine Learning, Data Science, Data Analysis, Building Mobile apps, Web
Scrapping, and most importantly on Automation. So, you can see that Python is
widely accepted and used and learning Python is the best decision you can take
to start your career as Software Developer.


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Labels: best of java67, Python



HOW TO USE @PROPERTYSOURCE ANNOTATION IN JAVA AND SPRING? PROPERTY SOURCE
EXAMPLE





Hello Java developers, if you are wondering What is property source in Spring
Framework and how to use @PropertySource annotation then you have come to the
right place. Earlier, I have shared the best books and online courses to learn
Spring Framework and in this article, I will teach you how to use
@PropertySource annotation in Spring to read Environment variables and inject
properties using @Value annotation. In the Spring application, one of the files
that are needed to provide properties to the Spring environment is the
@Configuration classes. 

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Labels: Spring Certification, spring framework, spring interview question



TOP 24 NODE.JS INTERVIEW QUESTIONS WITH ANSWERS FOR 1 TO 2 YEARS EXPERIENCED WEB
DEVELOPERS


Hello guys, if you are preparing for a JavaScript developer or web developer and
looking for common Node.js questions to prepare for interviews then you are at
right place. In the past, I have shared JavaScript interview questions, React
Questions, Angular Questions and even web development questions and in this
article, I am going to share frequently asked Node.js questions with answers for
interviews.  Though Node.js is defined as a JavaScript environment, it is widely
considered as a backend framework. Since its inception in 2008, Node.js has
become a popular term in the server-side development community. More and more
companies are using Node.js for backend development.

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Labels: interview questions, JavaScript, Node.js

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