There's the 3 big ones:
Eclipse
NetBeans and
IntelliJ

All are nice. I'm a big Java noob, but I like NetBeans the best. Can't really tell you why, though :) It's all personal preference.

NetBeans is probably the most RAM-hungry of the three..

Answer from cwap on Stack Overflow
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Online Java
online-java.com
Online Java - IDE, Code Editor, Compiler
Write, compile, and run Java code online with our fast and reliable online compiler and IDE.
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JDoodle
jdoodle.com β€Ί 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.
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Online IDE
online-ide.com β€Ί online_java_compiler
Online Java Compiler - OnlineIDE
Compile and Execute your Java programs online. OnlineIDE is a quick and easy tool that helps you to build, compile, test your programs.
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Programiz
programiz.com β€Ί java-programming β€Ί 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"); } }
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OneCompiler
onecompiler.com β€Ί 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
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OnlineGDB
onlinegdb.com β€Ί online_java_compiler
Online Java Compiler - online editor
OnlineGDB is online IDE with java compiler. Quick and easy way to run java program online.
Find elsewhere
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Codeanywhere
codeanywhere.com β€Ί languages β€Ί java
Java Online IDE, Compiler, Interpreter & Code Editor Β· AI Cloud IDE Β· Codeanywhere
Accelerate Your Java Development with AI-Powered Cloud IDE: Code, Deploy & Collaborate in Real-Time.Code in Java
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Scaler
scaler.com β€Ί home β€Ί topics β€Ί java β€Ί java compiler online | write, run & debug java easily
Online Java Compiler
Users can input Java code into the integrated development environment (IDE) provided by these online compilers, and the platform will compile and run the code in a secure environment.
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Ideone
ideone.com
Online Compiler and IDE >> C/C++, Java, PHP, Python, Perl and 70+ other compilers and interpreters - Ideone.com
Ideone is something more than a pastebin; it's an online compiler and debugging tool which allows to compile and run code online in more than 40 programming languages.
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W3Schools
w3schools.com β€Ί java β€Ί java_compiler.asp
Java Online Compiler (Editor / Interpreter)
With our online Java compiler, you can edit Java code, and view the result in your browser.
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Software Testing Help
softwaretestinghelp.com β€Ί home β€Ί java β€Ί the top 10+ java ides & online java compilers (2026 rankings)
The Top 10+ Java IDEs & Online Java Compilers (2026 Rankings)
December 18, 2025 - BlueJ is a good IDE for beginners and is very easy to learn. It is capable of showing the UML view of one’s project making it easy to find the classes for users. It allows the user to directly invoke the Java expression without compiling the code which makes BlueJ REPL for Java.
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Replit
replit.com β€Ί languages β€Ί java10
Java Online Compiler & Interpreter - Replit
Write and run Java code using our Java online compiler & interpreter. You can build, share, and host applications right from your browser!
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NextLeap
nextleap.app β€Ί online-compiler β€Ί java-programming
NextLeap - Online Java Compiler
Experience the power of Java with NextLeap's Java Online Compiler. Write, compile, and debug Java code online in real time.
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Remote Interview
remoteinterview.io β€Ί online-java-compiler
Online Java Compiler, IDE & Online Java Editor - Codepad – Remoteinterview.io
Online Java Compiler, IDE and Online Java Editor to conduct real time interviews, compile and run java online for free without making any installation at Codepad – Remoteinterview.io
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Softonic
java-compiler-ide.en.softonic.com β€Ί iphone
Java Compiler IDE for iPhone - Download
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