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stackoverflow.com › questions › 2279451 › how-to-compile-a-java-file-in-java

You need to set your classpath so that the Java compiler knows where to find the org.eclipse.* classes. You can do that with a command line switch or an environment variable.

Answer from benzado on Stack Overflow

Itssamuelrowe

itssamuelrowe.github.io › binarystars › installing-and-using-java-development-tools › compiling-and-running-a-java-program

Compiling and Running a Java Program :: Binary Stars

* To compile your program, enter javac HelloWorld.java * If you typed the program correctly, the javac command won’t display any messages. If the program contains any errors, error messages are displayed on your console. * If your program compiled successfully, the compiler would have created ...

Programiz

programiz.com › java-programming › online-compiler

Online Java Compiler - Programiz

// Online Java Compiler // Use this editor to write, compile and run your Java code online class Main { public static void main(String[] args) { System.out.println("Try programiz.pro"); } }

Discussions

Compiling Java

The Java compiler turns source code (.java file) insert Java bytecode (.class file). The class files need Java to run, and are usually packed into a .jar file which still needs Java to run. In order to generate a stand alone package for your code that you can run without needing Java installed use jpackage. Jpackage is included with the jdk since Java 16. More on reddit.com

r/javahelp

7

6

July 25, 2022

Can somebody teach me how to compile Java Programs from the command line?

Well, first you need to make sure you have Java SDK installed. I'm sure you do. Next you need to make sure the bin folder in your java folder is in your class path. Then from the command line, from in the directory where your file(s) is/are located, you just type javac filename.java and compile it. Then java filename to run it. More on reddit.com

r/learnprogramming

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August 23, 2013

Videos

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Intro to Java: Compile a Java file using Command Prompt - YouTube

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Java Tutorial - Compiling JAVA CODE - YouTube

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How to Run Java Programs With Command Prompt (cmd) and Notepad ...

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How to COMPILE & RUN JAVA! | (simple & easy) - YouTube

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DEV Community

dev.to › paulike › creating-compiling-and-executing-a-java-program-4am9

Creating, Compiling, and Executing a Java Program - DEV Community

April 22, 2024 - You save a Java program in a .java file and compile it into a .class file. The .class file is... Tagged with learning, java, beginners, programming.

Oracle

oracle.com › java › technical details

Essentials, Part 1, Lesson 1: Compiling & Running a Simple Program

... A program has to be converted to a form the Java VM can understand so any computer with a Java VM can interpret and run the program. Compiling a Java program means taking the programmer-readable text in your program file (also called source code) and converting it to bytecodes, which are ...

Braina

brainasoft.com › firecmd › tutorials › compile-and-run-java-programs.html

How to Compile and Run Java Programs | FireCMD Tutorials

Change your current working directory where the file MyProgram.java exists and just give the following command in FireCMD shell to compile your program: ... If there are no syntactical errors, FireCMD will return you to a new prompt without any error messages which means the code is compiled successfully.

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Stack Overflow

stackoverflow.com › questions › 2279451 › how-to-compile-a-java-file-in-java

compilation - How to compile a .java file in Java? - Stack Overflow

Top answer

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You need to set your classpath so that the Java compiler knows where to find the org.eclipse.* classes. You can do that with a command line switch or an environment variable.

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Ok, Stephen C I did this job by hand. I used only Notepad++ (I promise)

Start Notepad++ and create file HelloWorldSWT.java
Copy example from author
Save it!
Open cmd and go to the directory with HelloWorldSWT.java
Run the command javac HelloWorldSWT.java
Ok, go to the Eclipse directory and find the correct jar swt-3.4.2-win32-win32-x86.jar
Run this again

D:\workspaces\spf_workspace\hand-made>javac -cp "D:\Program files\eclipse3_5\plugins\org.eclipse.swt.win32.win32.x86_3.5.1.v3555a.jar" HelloWorldSWT.java

All process take 2 minutes.

Don't try to run this:

`D:\workspaces\spf_workspace\hand-made>java -cp "D:\Program files\eclipse3_5\plugins\org.eclipse.swt.win32.win32.x86_3.5.1.v3555a.jar;." HelloWorldSWT`

Note: I add current dir . to classpath too.

freeCodeCamp

freecodecamp.org › news › how-to-execute-and-run-java-code

How to Execute and Run Java Code from the Terminal

March 10, 2022 - Finally, I want to create the class file of my Java code inside the Source folder. The directory tree looks like this: myJavaProgram > Source. For compiling this type of Java code with the packages, we use the command javac -d .

JDoodle

jdoodle.com › online-java-compiler

Online Compiler and Editor/IDE for Java, C, C++, PHP, Python, Ruby, Perl - Code and Run Online

JDoodle is an Online Compiler, Editor, IDE for Java, C, C++, PHP, Perl, Python, Ruby and many more. You can run your programs on the fly online, and you can save and share them with others. Quick and Easy way to compile and run programs online.

Upgrad

upgrad.com › home › blog › software development › how to code, compile, and run java projects: a beginner’s guide

How to Code, Compile, and Run Java Projects in 2025

August 13, 2025 - The following section will guide you through the main steps for installing the latest Java Development Kit (JDK) and configuring your environment variables. This also involves selecting Java Integrated Development Environments (IDEs) that meet your professional requirements. You also learn how to Code, Compile, and Run Java Projects after setting up the entire environment.

reddit.com › r/javahelp › compiling java

r/javahelp on Reddit: Compiling Java

July 25, 2022 -

(before I start, I should say that I already know that the problem is me and not the IDE)

Im a bit confused... normally in Java, does the compiler compile the class file into an exe or an immediately runnable file without needing java installed or do you need java installed to run this file. I heard that Java is cross platform, but do you still need Java installed on the device that you are running the compiled class file from? Also, if it isn't supposed to compile into an exe, how would you create an exe such as the equivalent of Py-installer, where you don't need java installed, or it prompts you to install java. Cheers - Vip3rNB

Top answer

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The Java compiler turns source code (.java file) insert Java bytecode (.class file). The class files need Java to run, and are usually packed into a .jar file which still needs Java to run. In order to generate a stand alone package for your code that you can run without needing Java installed use jpackage. Jpackage is included with the jdk since Java 16.

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Java bytecode is cross-platform but it still requires a Java runtime installed on the target platform

JetBrains

jetbrains.com › help › idea › java-compiler.html

Java Compiler | IntelliJ IDEA Documentation

If you are not happy with the version of the Eclipse compiler bundled with IntelliJ IDEA, you can use the Path to ECJ batch compiler tool option located in the Settings | Build, Execution, Deployment | Compiler | Java Compiler and specify a particular Eclipse compiler version.

GeeksforGeeks

geeksforgeeks.org › java › compilation-execution-java-program

Compilation and Execution of a Java Program - GeeksforGeeks

October 14, 2025 - Geeks.java is the file to compile. ... If there are no errors, this command will create a file called Geeks.class. The .class file contains bytecode, which is a platform-independent code that the JVM can execute. If there are errors, the compiler will show them in the terminal.

GitHub

gist.github.com › tgab › 323155

Command-Line Compiling in Java · GitHub

This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.

Florida State University

cs.fsu.edu › ~myers › cop3252 › howto › cmdline.html

Compiling on the Command line with Java SDK

To compile a source code file, the command format is: javac filenmame · Examples: javac Example1.java javac MyProg.java javac Arithmetic.java · The result will be a file (or files) ending in .class · For every class in a source code file, a full .class file is created ·

Quora

quora.com › How-do-I-compile-and-run-a-Java-program

How to compile and run a Java program - Quora

2. Type 'javac MyFirstProgram.java' and press enter to compile your code. If there are no errors in your code, the command prompt will take you to the next line (Assumption: The...

Scilab

help.scilab.org › jcompile

jcompile - Compile Java code or file

February 4, 2026 - directory=SCI+"/modules/external_objects_java/examples/com/foo/"; // Compile of all them jcompile(ls(directory + "/*.java"))

Hofstra

cs.hofstra.edu › docs › guides › compiling_java.html

How to edit, compile, and run Java programs | Computer Science

April 13, 2018 - This will create a java bytecode ... source code, named: "Test" to be ready to execute by JVM. Optionally, you could use javac options to specify your source path and output directory for that particular invocation, for example: ... Suppose you are not exactly in your source file directory which is your home directory and you want the compiled file put in ...

OneCompiler

onecompiler.com › java

Java Online Compiler

OneCompiler's Online Java Editor helps you write, compile, run and debug Java code online. The code runs on latest JDK & JRE

Ask Ubuntu

askubuntu.com › questions › 145748 › how-to-compile-a-java-file-on-ubuntu

compiling - How to compile a .java file on Ubuntu? - Ask Ubuntu

Top answer

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To compile the file, open your terminal and type

javac filename.java

To run the generated class file, use

java filename

But to do this you need to have the Java JDK installed in your computer. You can install it with the instructions in How do I install Java?.

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OpenJDK works best for me. It's simple and I have never faced any problem with it. Just follow these simple steps:

From Terminal install open jdk
```
sudo apt-get install openjdk-7-jdk
```
Write a java program and save the file as filename.java
Now to compile use this command from the terminal
```
javac filename.java
```
If everything works well then a new "filename.class" file should be created.
To run your program that you've just compiled type the command below in terminal:
```
java filename
```

NOTE

You can use any text editor (like gedit) ,

replace the filename with watever name you want

you need to be on same directory as the "present working directory" (got by running pwd) while running the command from terminal.

reddit.com › r/learnprogramming › can somebody teach me how to compile java programs from the command line?

r/learnprogramming on Reddit: Can somebody teach me how to compile Java Programs from the command line?

August 23, 2013 -

I have no idea how to compile from the command line. My previous teacher neglected to teach us this, and I only know how to use Eclipse. Alright, so my issue was more about getting the PATH variable and file placement, not so much the actual commands

Top answer

1 of 5

16

Well, first you need to make sure you have Java SDK installed. I'm sure you do. Next you need to make sure the bin folder in your java folder is in your class path. Then from the command line, from in the directory where your file(s) is/are located, you just type javac filename.java and compile it. Then java filename to run it.

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google " compile java in cmd"