# Java Programs
➤ Introduction to Java
➤ Java Editions & Concepts
➤ JDK JRE JVM JIT in Java
➤ How to Run Java program
➤ Java Hello World program
➤ How to set the Java path
➤ Classpath Environment
➤ Tokens in Java Language
➤ List of Java Keywords
➤ Identifiers in Java
➤ Data types in Java
➤ Float & double in Java
➤ Literals in Java
➤ Escape Sequence In Java
➤ Unicode character set
➤ String data type in Java
➤ Arithmetic operators in Java
➤ Increment and Decrement
➤ Comments in Java
➤ Java Naming Conventions
➤ Static Import in Java
How to run a Java program on a computer? We can run a Java program online or we can install Java virtual machine (JVM) in our computer system.
Run Java Program Online
There are several sites that allow us to run a Java program online. But online compilers have some limitations like we can’t work with files. It is not a good idea to always use them. Some sites are ideone.com, onlinegbd.com, Codepad, CodeChef
Run Java Program in Windows by Installing Oracle JDK
Step1:- To Run Java programs in windows, Download the latest version of JDK from the Oracle website. Download .exe or .zip file.
Step2:- Install the downloaded .exe file. Or, for .zip file just extract it.
Now, JDK is installed on your system.
Just by installing software, its binary and library files are not available from other directories automatically. We must update environment variables with that software binary and binary file path. Now, let us update the environment variables.
Note:- If you are installing Java SE using .exe file which is only for Windows OS then the Oracle JDK offers “installers” (msi, rpm, deb, etc.) which not only place the JDK binaries in your system but also contain update rules and in some cases handle some common configurations like set common environmental variables (such as, JAVA_HOME in Windows) and establish file associations (such as, use java to launch .jar files). The Java SE Windows installer provides java.exe, javaw.exe, javac.exe, and jshell.exe commands in a system location so that users can run Java applications without needing to provide the path to the Oracle JDK’s installation folder. So, you can directly go to Step7 to check the installation is done correctly or not. No need to follow Step3 to Step6.
Step3:- Go to the Advanced system setting.
My Computer -> Properties -> Advanced System Settings
Step4:- Click on Environment variables.
Step5:- In this Window, in the User variables section or System variables section, we must create a Path.
There are some differences between creating path variables in the user variables section vs system variables section. Learn more:- Different ways to set the Java path
Step6:- Add, Variable name = “path”
The Variable value is a location where Java is installed. By default, Java is installed in “C:\Program Files\Java\jdk\bin” Or, “C:\Program Files(x86)\Java\jdk\bin”.
In case, you have installed java at another location, then add that path.
Click on OK, save the settings. You have done.
Step7:- Now, check the installation is done correctly or not. Open, Command prompt (cmd) and type
> java -version java version "13.0.1" 2020-01-14 Java(TM) SE Runtime Environment (build 13.0.1+8) Java HotSpot(TM) 64-Bit Server VM (build 13.0.1+8, mixed mode, sharing)
In order to make sure whether the compiler is set up, type javac in command prompt. You will see a list related to javac.
> javac Usage: javac <options> <source files> where possible options include: ........... ...........
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