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The Java Development Kit (JDK), officially named 'Java Platform Standard Edition' or 'Java SE', is needed for writing Java programs. The JDK is freely available from Sun Microsystems (now part of Oracle). The mother site for JDK (Java SE) is http://www.oracle.com/technetwork/java/javase/overview/index.html.

When you install the Java Development Kit (JDK), the associated Java Runtime Environment (JRE) is installed at the same time. The JavaFX SDK and Runtime are also installed and integrated into the standard JDK directory structure. Depending on your processor, the downloaded file has one of the following names: jdk-8u version-macosx-amd64.dmg. Download the JDK.dmg file, jdk-11. Before the file can be downloaded, you must accept the license agreement. From either the browser Downloads window or from the file browser, double-click the.dmg file to start it. Java is a runtime environment maintained by Oracle that you must install on your Mac to be able to run applications written using the Java programming language. Moreover, Java allows developers to make apps available on multiple operating systems at the same time because Java-based utilities will run. Java is a runtime environment maintained by Oracle that you must install on your Mac to be able to run applications written using the Java programming language. Moreover, Java allows developers to make apps available on multiple operating systems at the same time because Java-based utilities will run on any platform that can integrate the runtime environment. Java SE Development Kit 8 Downloads. Thank you for downloading this release of the Java™ Platform, Standard Edition Development Kit (JDK™). The JDK is a development environment for building applications, applets, and components using the Java programming language.

'JDK' or 'JRE'?

JRE (Java Runtime) is needed for running Java programs. JDK (Java Development Kit), which includes JRE plus the development tools (such as compiler and debugger), is need for writing as well as running Java programs. In other words, JRE is a subset of JDK. Since you are supposed to write Java Programs, you should install JDK, which includes JRE.

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JDK Versions

Reference: 'Java Version History' @ https://en.wikipedia.org/wiki/Java_version_history.

JDK Alpha and Beta (1995): Sun Microsystem announced Java in September 23, 1995.
JDK 1.0 (January 1996): Originally called Oak (named after the oak tree outside James Gosling's office). Renamed to Java 1 in JDK 1.0.2.
JDK 1.1 (February 1997): Introduced AWT event model, inner class, JavaBean, JDBC, and RMI.
J2SE 1.2 (JDK 1.2) (December 1998): Re-branded as 'Java 2' and renamed JDK to J2SE (Java 2 Standard Edition). Also released J2EE (Java 2 Enterprise Edition) and J2ME (Java 2 Micro Edition). Included JFC (Java Foundation Classes - Swing, Accessibility API, Java 2D, Pluggable Look & Feel, and Drag & Drop). Also introduced Collection Framework and JIT compiler.
J2SE 1.3 (JDK 1.3) (May 2000): Introduced Hotspot JVM.
J2SE 1.4 (JDK 1.4) (February 2002): Introduced assert statement, non-blocking IO (nio), logging API, image IO, Java webstart, regular expression (regex) support.
J2SE 5.0 (JDK 5) (September 2004): Officially called 5.0 instead of 1.5 (by dropping the 1.). Introduced generics, autoboxing/unboxing, annotation, enum, varargs, for-each loop, static import. See 'JDK 5 New Features'.
Java SE 6 (JDK 6) (December 2006): Renamed J2SE to Java SE (Java Platform Standard Edition). No new language features. See 'JDK 6 New Features'.
Java SE 7 (JDK 7) (July 2011): First version after Oracle purchased Sun Microsystem - aslo called OracleJDK. Introduced Strings in switch statement, Binary integer literals, allowing underscores in numeric literals, improved type inference for generic instance creation (or diamond operator <>), Catching multiple exception types and rethrowing exceptions with improved type checking. See 'JDK 7 New Features'.
Java SE 8 (JDK 8) (LTS) (March 2014): Included support for Lambda expressions, default and static methods in interfaces, improved collection, and JavaScript runtime. Also integrated JavaFX graphics subsystem. See 'JDK 8 New Features'.
Java SE 9 (JDK 9) (September 21, 2017): Introduced modularization of the JDK (module) under project Jigsaw, the Java Shell (jshell), and more. See 'JDK 9 New Features'.
Java SE 10 (18.3) (JDK 10) (March 2018): Introduced var for type inference local variable (similar to JavaScript). Introduced time-based release versioning with two releases each year, in March and September, denoted as YY.M. Removed native-header generation tool javah. See 'JDK 10 New Features'.
Java SE 11 (18.9) (LTS) (JDK 11) (September 2018): Extended var to lambda expression. Standardize HTTP client in java.net.http. Support TLS 1.3. Clean up the JDK and the installation package (removed JavaFX, JavaEE, CORBA modules, deprecated Nashorn JavaScript engine). OracleJDK is no longer free for commercial use, but OpenJDK is still free. See 'JDK 11 New Features'.
Java SE 12 (19.3) (JDK 12) (March 2019): Switch Expression (preview). See 'JDK 12 New Features'.
Java SE 13 (19.9) (JDK 13) (September 2019): Switch Expression (preview), Multi-line Text Block (preview). See 'JDK 13 New Features'.
Java SE 14 (20.3) (JDK 14) (March 2020): Records (preview)

How To Install JDK on Windows

Step 0: Un-Install Older Version(s) of JDK/JRE

I recommend that you install only the latest JDK. Although you can install multiple versions of JDK/JRE concurrently, it is messy.

If you have previously installed older version(s) of JDK/JRE, un-install ALL of them. Goto 'Control Panel' ⇒ (optional) 'Programs' ⇒ 'Programs and Features' ⇒ Un-install ALL programs begin with 'Java', such as 'Java SE Development Kit ..', 'Java SE Runtime ..', 'Java X Update ..', and etc.

Step 1: Download JDK

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Goto Java SE download site @ http://www.oracle.com/technetwork/java/javase/downloads/index.html.
Under 'Java Platform, Standard Edition' ⇒ 'Java SE 13.0.{x}', where {x} denotes a fast running security-update number ⇒ Click the 'Oracle JDK Download' button.
Under 'Java SE Development Kit 13.0.{x}' ⇒ Check 'Accept License Agreement'.
Choose the JDK for your operating system, i.e., 'Windows'. Download the 'exe' installer (e.g., 'jdk-13.0.{x}_windows-x64_bin.exe' - about 159MB).

Step 2: Install JDK

Run the downloaded installer (e.g., 'jdk-13.0.{x}_windows-x64_bin.exe'), which installs both the JDK and JRE.

By default, JDK is installed in directory 'C:Program FilesJavajdk-13.0.{x}', where {x} denotes the update number. Accept the defaults and follow the screen instructions to install JDK.

/sono-hanabira-english-patch.html. Use your 'File Explorer', navigate to 'C:Program FilesJava' to inspect the sub-directories. Take note of your JDK installed directoryjdk-13.0.{x}, in particular, the update number {x}, which you will need in the next step.

I shall refer to the JDK installed directory as <JAVA_HOME>, hereafter, in this article.

Step 3: Include JDK's 'bin' Directory in the PATH

Windows' Command Prompt (CMD) searches the current directory and the directories listed in the PATHenvironment variable (or system variable) for executable programs. JDK's programs (such as Java compiler 'javac.exe' and Java runtime 'java.exe') reside in the sub-directory 'bin' of the JDK installed directory. You need to include JDK's 'bin' in the PATH to run the JDK programs.

To edit the PATH environment variable in Windows 10:

Launch 'Control Panel' ⇒ (Optional) 'System and Security' ⇒ 'System' ⇒ Click 'Advanced system settings' on the left pane.
Switch to 'Advanced' tab ⇒ Click 'Environment Variables' button.
Under 'System Variables' (the bottom pane), scroll down to select variable 'Path' ⇒ Click 'Edit..'.
For Newer Windows 10:
You shall see a TABLE listing all the existing PATH entries (if not, goto next step). Click 'New' ⇒ Click 'Browse' and navigate to your JDK's 'bin' directory, i.e., 'c:Program FilesJavajdk-13.0.{x}bin', where {x} is your installation update number ⇒ Select 'Move Up' to move this entry all the way to the TOP.
For Older Windows 10 (Time to change your computer!):
(CAUTION: Read this paragraph 3 times before doing this step! Don't push 'Apply' or 'OK' until you are 101% sure. There is no UNDO!!!)
(To be SAFE, copy the content of the 'Variable value' to Notepad before changing it!!!)
In 'Variable value' field, APPEND 'c:Program FilesJavajdk-13.0.{x}bin' (where {x} is your installation update number) IN FRONT of all the existing directories, followed by a semi-colon (;) to separate the JDK's bin directory from the rest of the existing directories. DO NOT DELETE any existing entries; otherwise, some existing applications may not run.

Note: If you have started CMD, you need to re-start for the new environment settings to take effect.

Step 4: Verify the JDK Installation

Launch a CMD via one of the following means:

Click 'Search' button ⇒ Type 'cmd' ⇒ Choose 'Command Prompt', or
Right-click 'Start' button ⇒ run.. ⇒ enter 'cmd', or
Click 'Start' button ⇒ Windows System ⇒ Command Prompt

Issue the following commands to verify your JDK installation:

Issue 'path' command to list the contents of the PATH environment variable. Check to make sure that your JDK's 'bin' is listed in the PATH.
Issue the following commands to verify that JDK/JRE are properly installed and display their version:

Step 5: Write a Hello-World Java Program

Create a directory to keep your works, e.g., 'd:myProject' or 'c:myProject'. Do NOT save your works in 'Desktop' or 'Documents' as they are hard to locate. The directory name shall not contain blank or special characters. Use meaningful but short name as it is easier to type.
Launch a programming text editor (such as TextPad, NotePad++, Sublime Text, Atom). Begin with a new file and enter the following source code. Save the file as 'Hello.java', under your work directory (e.g., d:myProject).

Step 6: Compile and Run the Hello-World Java Program

To compile the source code 'Hello.java':

Start a CMD Shell (Search ⇒ enter 'cmd' ⇒ select 'Command Prompt').
Set the Current Drive to the drive where you saved your source file 'Hello.java'.
If you use drive 'c', skip this step.
Else if you use drive 'd', enter 'd:' as follow:
Set the Current Working Directory to the directory that you saved your source file via the cd (Change Directory) command. For example, suppose that your source file is saved in directory 'myProject'.
Issue a dir (List Directory) command to confirm that your source file is present in the current directory.
Invoke the JDK compiler 'javac' to compile the source code 'Hello.java'. The compilation is successful if the command prompt returns. Otherwise, error messages would be shown. Correct the errors in your source file and re-compile. Check 'Common JDK Installation Errors', if you encounter problem compiling your program.
The output of the compilation is a Java class called 'Hello.class'. Issue a dir (List Directory) command again to check for the output.

To run the program, invoke the Java Runtime 'java':

Everything that can possibly go wrong will go wrong: Read 'JDK Installation Common Errors'.

Step 7: (For Advanced Users Only) JDK's Source Code

Source code for JDK is provided and kept in '<JAVA_HOME>libsrc.zip' (or '<JAVA_HOME>src.zip' prior to JDK 9). I strongly recommend that you to go through some of the source files such as 'String.java', 'Math.java', and 'Integer.java', under 'javalang', to learn how experts program.

How to Install JDK on macOS

Step 1: Check if JDK has been Pre-Installed

To check if JDK has been installed, open a 'Terminal' (Search 'Terminal'; or Finder ⇒ Go ⇒ Utilities ⇒ Terminal) and issue this command:

If a JDK version number is returned (e.g., JDK x.x.x), then JDK has already been installed. If the JDK version is prior to 1.8, proceed to Step 2 to install the latest JDK; otherwise, proceed to 'Step 3: Write a Hello-world Java program'.
If message 'command not found' appears, JDK is NOT installed. Proceed to the 'Step 2: Install JDK'.
If message 'To open javac, you need a Java runtime' appears, select 'Install' and follow the instructions to install JDK. Then, proceed to 'Step 3: Write a Hello-world Java program'.

Step 2: Download JDK

Goto Java SE download site @ http://www.oracle.com/technetwork/java/javase/downloads/index.html.
Under 'Java Platform, Standard Edition' ⇒ 'Java SE 13.0.{x}', where {x} denotes a fast running security-update number ⇒ Click the 'Oracle JDK' 'Download' button.
Under 'Java SE Development Kit 13.0.{x}' ⇒ Check 'Accept License Agreement'.
Choose the JDK for your operating platform, i.e., macOS. Download the DMG installer (e.g, jdk-13.0.{x}_osx-x64_bin.dmg - about 172MB).

Step 3: Install JDK/JRE

Double-click the downloaded Disk Image (DMG) file. Follow the screen instructions to install JDK/JRE.
Eject the DMG file.
To verify your installation, open a 'Terminal' and issue these commands.

Step 3: Write a Hello-World Java Program

Create a directory called 'myProject' under your home directory (Launch 'Finder' ⇒ 'Go' ⇒ 'Home'; Select 'File' ⇒ 'New Folder' ⇒ 'myProject').
In macOS, the home directory of the current user can be referenced as '~'. Hence, this new directory can be referenced as '~/myProject'.
Use a programming text editor (such as Sublime Text or Atom) to input the following source code and save as 'Hello.java' under the directory '~/myProject'.
(If you use macOS's default text editor 'TextEdit' (NOT recommended), you need to open a new file ⇒ choose 'Format' ⇒ 'Make Plain Text' ⇒ Enter the source code ⇒ Save as 'Hello.java'.)

Step 4: Compile and Run the Hello-World Java Program

To compile the source code 'Hello.java', open a new 'Terminal' ('Go' ⇒ 'Utilities' ⇒ 'Terminal') and issue these commands (as illustrated):
To run the Hello-world, invoke the Java Runtime 'java' as follows:

How to Install JDK on Ubuntu

There are several JDK implementations available for Linux, such as Oracle JDK, OpenJDK, Sun JDK, IBM JDK and GNU Java Compiler. We shall choose the Oracle JDK 8. Ubuntu chooses OpenJDK as its default JDK, which is not 100% compatible with Oracle JDK.

Step 0: Check if JDK has already been Installed

Open a Terminal and issue this command:

If a JDK version number (e.g., 'javac x.x.x') appears, JDK has already been installed. You can skip the installation and goto step 2.

To remove OpenJDK, issue command:

Step 1: Download and Install JDK

Goto JDK (Java SE) download site @ http://www.oracle.com/technetwork/java/javase/downloads/index.html. Under 'Java Platform, Standard Edition' ⇒ 'Java SE 11.0.{x}' ⇒ Click JDK's 'Download' ⇒ Under 'Java SE Development Kit 11.0.{x}' ⇒ Check 'Accept License Agreement' ⇒ Select 'Linux', 'tar.gz' package, (e.g., 'jdk-13.0.{x}-linux-x64_bin.tar.gz' - 171MB).
The tarball will be downloaded in directory '~/Downloads', by default.
We shall install JDK under '/usr/local/java' (or Ubuntu's default JDK directory /usr/lib/jvm; or /opt/java). First, create a directory 'java' under '/usr/local'. Open a Terminal and issue these commands: Extract the downloaded package (Check your downloaded filename!) JDK shall be extracted in a folder '/usr/local/java/jdk-13.0.{x}', where {x} is the update number.
Inform the Ubuntu to use this JDK/JRE: The above steps set up symlinks java, javac, javaws at /usr/bin (which is in the PATH), that link to /etc/alternatives and then to JDK bin directory.
The 'alternatives' system aims to resolve the situation where several programs fulfilling the same function (e.g., different version of JDKs). It sets up symlinks thru /etc/alternatives to refer to the actual programs to be used.
Alternatively, you can include the JDK's bin and JRE's bin into the PATH directly.
To verify the JDK installation, issue these commands:
[Don't Do this step - It is taken care by 'alternative' in Step 3. Keep here to show you how to set PATH.]
Add JDK's binary directory ('bin') to the 'PATH' by editing '/etc/profile': Add these lines at the end of the file '/etc/profile', replace '{x}' with the actual number: Rerun the configuration file by:

Step 2: Compile and Run a Hello-world Java Program

File Explorer ⇒ Home ⇒ Create a new folder called 'myProject' to keep our works.
Open 'Text Editor' (gedit). Enter the following source code and save as 'Hello.java' under the '~/myProject' directory created earlier.
To compile the Hello-world Java program, launch a Terminal and issue these commands:
Run the Hello-world Java program:

Source-Code Editors & IDEs for Java Programming

Eclipse IDE

You need to first install Eclipse. Read 'How to Install Eclipse'.
You can then proceed to write your first Java program. Read 'Writing your first Java Program with Eclipse'.
Eclipse allow you to debug program graphically. Read 'Debugging program in Eclipse'.

NetBeans IDE

You need to first install NetBeans. Read 'How to Install NetBeans'.
You can then proceed to write your first Java program. Read 'Writing your first Java program with NetBeans'.
NetBeans allow you to debug program graphically. Read 'Debugging program in NetBeans'.

Visual Studio (VS) Code IDE

Click HERE, look for 'VS Code for Java Programming'

Sublime Text (for Windows, macOS, Linux)

Click HERE, look for 'Sublime Text for Java Programming'

Atom (for Windows, macOS, Linux)

[TODO]

TextPad (for Windows only)

Click HERE, look for 'TextPad for Java Programming'.

NotePad++ (for Windows only)

Click HERE, look for 'NotePad++ for Java Programming'.

(JDK 11) Launch Single-Source-File New Feature

From JDK 11, you can compile/run a single-file program in one step, without explicit compilation.

Write a 'Hello.java' (see previous section).
Delete 'Hello.class', if it exists.
You can compile/run 'Hello.java' in one command as follows:

Notes:

This is applicable to single source-file only.
No need to use javac to compile the program.
It compiles in memory (without producing a .class file), and run.
This feature is introduced for beginners to learn Java, and for professionals to test a Java feature.
The filename and classname need not be the same.

How To Set JAVA_HOME Environment Variable

Many Java applications (such as Tomcat) require the environment variable JAVA_HOME to be set to the JDK installed directory.

See 'How to set JAVA_HOME for Windows' or 'How to set JAVA_HOME for macOS/Linux'.

Common Errors in installing JDK

(Advanced) External JAR Files and Native Libraries

Notes: This section is applicable to JDK prior to JDK 9. JDK 9 introduces a new level called 'module' on top of package, and 'jmod' files for Java modules. Need to revise this section for JDK 9.

External Java packages (such as Servlet, MySQL Connector/J, JOGL, JUnit) are often distributed in JAR files (Java Archive - a single-file package of many Java classes), with possibly Native Libraries ('.lib' and '.dll' in Windows, or '.a' and '.so' in Linux/macOS).

External JAR Files ('.jar')

If external JAR files are not properly included:

During the compilation, you will receive compilation error 'cannot find symbol' on classes belonging to the external packages.
During execution, you will get a runtime error 'Could not find or load main class xxx' or 'NoClassDefFoundError'.

To include external JAR files, you can either:

Copy all the JAR files of the external packages to the Java's Extension Directories (NOT applicable to JDK 9).
- For Windows, the JDK extension directory is located at '<JAVA_HOME>jrelibext' (e.g., 'c:Program FilesJavajdk1.8.0_xxjrelibext').
- For macOS, the JDK extension directories are '/Library/Java/Extensions' and '/System/Library/Java/Extensions'.
- For Ubuntu, the JDK extension directories are '<JAVA_HOME>/jre/lib/ext' (e.g., '/usr/user/java/jdk1.8.0_xx/jre/lib/ext') and '/usr/java/packages/lib/ext'.
The location of JDK's extension directories is kept in Java's System Property 'java.ext.dirs'. You can print its contents via System.out.println(System.getProperty('java.ext.dirs')).
You can also include all the JAR files in the CLASSPATH environment variable. CLASSPATH may contain directories (of Java classes) or JAR files (single-file archive of Java classes). If you set the CLASSPATH, you must also include the current directory (denoted as '.').
- For Windows, set the CLASSPATH in Control Panel ⇒ System ⇒ Advanced system settings ⇒ Advanced ⇒ Environment Variables ⇒ System Variables ⇒ New ⇒ In 'Variable name', enter 'CLASSPATH' ⇒ In 'Variable value', enter '.;path1xxx.jar;path2yyy.jar', where the entries are separated by a semi-colon (;).
- For Linux and macOS: Edit ~/.profile or ~/.bash_profile (or /etc/profile for system-wide setting) to include the following line at the end of the file: The entries are separated by colon (:).
You can also set the CLASSPATH in the javac/java command-line via the option -cp <paths> (or -classpath <paths>), for example,

External Native Libraries ('.lib', '.dll', '.a', '.so')

Some external package may provide static or shared native libraries in the form of '.lib' (Windows' static LIBrary), '.dll' (Windows' Dynamically Link Library), '.a' (Unix's static (Archive) library), or '.so' (Unix's Shared Object library).

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Native Libraries are to be kept in a directory accessible via JRE's Property 'java.library.path', which normally but not necessarily includes all the directories in the PATH environment variable.

Native libraries are not involved in the compilation. But if they are not properly included during runtime time, you will get a runtime error 'java.lang.UnsatisfiedLinkError: no xxx in java.library.path'.

To include external native libraries:

Copy the native libraries into a system library directory, e.g., c:windowssystem32 (Windows), /usr/lib or /usr/local/lib (macOS / Unix). You can verify that the directory is included in Java's System Property 'java.library.path', via System.out.println(System.getProperty('java.library.path')).
You can also set the native library path via the java's command-line option -Djava.library.path=xxx, for example,

Eclipse/NetBeans

Using an IDE can greatly simplifies inclusion of external packages. Read 'Eclipse How-To' or 'NetBeans How-To'.

Link to References & Resources