Markus  Bartell

Markus Bartell


Compact Strings in Java 9

Before Java 9, Strings was internally represented by a char array containing the characters of the string. Since Java internally uses UTF-16, every char occupies two bytes, also if a single character can be represented using a single byte (LATIN-1 representation), then there is potential to improve performances and memory consumption.

Java 9 has introduced this concepts of Compact Strings :

Whenever we create a String, if all its characters can be represented using a single byte (LATIN-1), a byte array will be used internally to save half space required.

This means that if there is only one character requiring more than 8 bits for the representation, Java will use UTF-16 with a char array.

String implementation

Until Java 9, a String was stored as a char array, as follows :

private final char[] value;

From Java 9, a String is represented with a byte array with the help of a coder field, as follows :

private final byte[] value;
/*can be LATIN1 = 0 or UTF16 = 1 */
private final byte coder;

Most of the String operations must check the coder value and dispatch to the specific implementation. The change does not affect any public interfaces of String or any other related classes. Many of the classes working with Strings (such as StringBuffer or StringBuilder) were updated to support the new String representation.

#string #programming #java #developer

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Compact Strings in Java 9
Tyrique  Littel

Tyrique Littel


How to Install OpenJDK 11 on CentOS 8

What is OpenJDK?

OpenJDk or Open Java Development Kit is a free, open-source framework of the Java Platform, Standard Edition (or Java SE). It contains the virtual machine, the Java Class Library, and the Java compiler. The difference between the Oracle OpenJDK and Oracle JDK is that OpenJDK is a source code reference point for the open-source model. Simultaneously, the Oracle JDK is a continuation or advanced model of the OpenJDK, which is not open source and requires a license to use.

In this article, we will be installing OpenJDK on Centos 8.

#tutorials #alternatives #centos #centos 8 #configuration #dnf #frameworks #java #java development kit #java ee #java environment variables #java framework #java jdk #java jre #java platform #java sdk #java se #jdk #jre #open java development kit #open source #openjdk #openjdk 11 #openjdk 8 #openjdk runtime environment

Samanta  Moore

Samanta Moore


Functions for Strings in Java

In this tutorial, you will learn how to make better use of built-in functions for Strings in Java to program more quickly, effectively, and aesthetically.

What Is a String?

Firstly, of course, we have to initialize our string. What is a string used for?

  • You want to look at your string as a line, not as a mass of symbols.
  • If you have a long text, you want to work with the words, not the letters.
  • If you have lots of information, you need functions that solve questions as quickly as possible.

#java #tutorial #java strings #java tutorial for beginners #java string #string tutorial

Samanta  Moore

Samanta Moore


Going Beyond Java 8: Local Variable Type Inference (var) - DZone Java

According to some surveys, such as JetBrains’s great survey, Java 8 is currently the most used version of Java, despite being a 2014 release.

What you are reading is one in a series of articles titled ‘Going beyond Java 8,’ inspired by the contents of my book, Java for Aliens. These articles will guide you step-by-step through the most important features introduced to the language, starting from version 9. The aim is to make you aware of how important it is to move forward from Java 8, explaining the enormous advantages that the latest versions of the language offer.

In this article, we will talk about the most important new feature introduced with Java 10. Officially called local variable type inference, this feature is better known as the **introduction of the word **var. Despite the complicated name, it is actually quite a simple feature to use. However, some observations need to be made before we can see the impact that the introduction of the word var has on other pre-existing characteristics.

#java #java 11 #java 10 #java 12 #var #java 14 #java 13 #java 15 #verbosity

Macey  Legros

Macey Legros


Java String Class Example | String Class in Java Tutorial

Java String is an inbuilt class that deals with all that is written in double quotation marks, or other words string is a collection of characters. For example – “Java” is a String of length 4.  Every string is an instance of this class. They are immutable, and so once written, and their value cannot be changed.

See the following figure.

Java String Class Example

The string is a sequence of characters. In Java, objects of String are immutable, which means a constant and cannot be changed once created. The java.lang.String class provides a lot of functions to work on the string. With the help of these functions, we can perform the operations on string such as trimming, concatenating, converting, comparing, replacing strings, etc.

#Why Strings are immutable or final in Java

Strings are used as parameters for many Java classes e.g.

  1. For opening a network connection.
  2. For opening a database connection.
  3. For File handling.

In case if strings were not immutable, this would have jeopardized the security.

#java #java string class #java.lang.string

Joseph  Murray

Joseph Murray


String Functions In Java | Java String [With Examples]


Java has gained a lot of respect among programmers because of its object-oriented programming support and pre-defined functions for data types provided. Strings are one of the impressing data types provided by java.

They are immutable and stored on the heap area in a separate memory block called String Constant Pool. There are many pre-defined functions for strings in java, let’s explore them!

#full stack development #java #string #string functions java