Online Java Compiler (OpenJDK 11.0.17)
Online Java Compiler (OpenJDK 11.0.17) helps you to Edit, Run and Share your Java Code directly from your browser. This development environment provides you version OpenJDK 11.0.17.
How to give program Input?
The latest version of Coding Ground allows to provide program input at run time from the termnial window exactly the same way as you run your program at your own computer. So simply run a program and provide your program input (if any) from the terminal window available in the right side.
Keyboard Shortcuts
| Shortcut | Description |
|---|---|
| ⌘ + Enter | Run the program |
| ⌘ + S | Save Project (Login Required) |
| ⇧ + ⌘ + S | Save As Project |
| ⌘ + P | New Project |
| ⌘ + G | Share Project |
| ⌘ + Z | Undo Editing |
| ⌘ + Y | Redo Editing |
| ⌘ + A | Select All Text |
| ⌘ + X | Cut Selected Text |
| ⌘ + C | Copy Selected Text |
| ⌘ + V | Paste Copied Text |
| ⌘ + F | Search Text |
| ⌘ + ⌥ + F | Replace Text |
| Shortcut | Description |
|---|---|
| Ctrl + Enter | Run the program |
| Ctrl + S | Save Project |
| Shift + Ctrl + S | Save As Project |
| Ctrl + G | Share Project |
| Ctrl + Z | Undo Editing |
| Ctrl + Y | Redo Editing |
| Ctrl + A | Select All Text |
| Ctrl + X | Cut Selected Text |
| Ctrl + C | Copy Selected Text |
| Ctrl + V | Paste Copied Text |
| Ctrl + F | Search Text |
| Ctrl + H | Replace Text |
Save Java Project
You can save your Java Project with us so that you can access this project later on. To save a project you will need to create a login Id with us. So before you save a project, please create a login Id using a link given at the top right corner of this page.
Share Java Project
You can use this feature to share your Java Code with your teachers, classmates and colleagues. Just click Share Button and it will create a short link, which can be shared through Email, WhatsApp or even through Social Media. A shared link will be deleted if it has been passive for almost 3 months.
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Running Turbo C Project
Save Project
Extra Compiler Flags
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New File
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Share Link
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Keyboard Shortcuts
IDE Shortcuts: New file : Ctrl-M Run Code : F9 Debug Code : F8 Save Project : Ctrl-S Beautify Code : Ctrl-B Settings Menu : Ctrl-Shift-S Info : Ctrl-I Editor Shortcuts: showSettingsMenu : Ctrl-, goToNextError : Alt-E goToPreviousError : Alt-Shift-E selectall : Ctrl-A gotoline : Ctrl-L fold : Alt-L|Ctrl-F1 unfold : Alt-Shift-L|Ctrl-Shift-F1 toggleFoldWidget : F2 toggleParentFoldWidget : Alt-F2 foldOther : Alt-0 unfoldall : Alt-Shift-0 findnext : Ctrl-K findprevious : Ctrl-Shift-K selectOrFindNext : Alt-K selectOrFindPrevious : Alt-Shift-K find : Ctrl-F overwrite : Insert selecttostart : Ctrl-Shift-Home gotostart : Ctrl-Home selectup : Shift-Up golineup : Up selecttoend : Ctrl-Shift-End gotoend : Ctrl-End selectdown : Shift-Down golinedown : Down selectwordleft : Ctrl-Shift-Left gotowordleft : Ctrl-Left selecttolinestart : Alt-Shift-Left gotolinestart : Alt-Left|Home selectleft : Shift-Left gotoleft : Left selectwordright : Ctrl-Shift-Right gotowordright : Ctrl-Right selecttolineend : Alt-Shift-Right gotolineend : Alt-Right|End selectright : Shift-Right gotoright : Right selectpagedown : Shift-Pagedown gotopagedown : Pagedown selectpageup : Shift-Pageup gotopageup : Pageup scrollup : Ctrl-Up scrolldown : Ctrl-Down selectlinestart : Shift-Home selectlineend : Shift-End togglerecording : Ctrl-Alt-E replaymacro : Ctrl-Shift-E jumptomatching : Ctrl-P selecttomatching : Ctrl-Shift-P expandToMatching : Ctrl-Shift-M removeline : Ctrl-D duplicateSelection : Ctrl-Shift-D sortlines : Ctrl-Alt-S togglecomment : Ctrl-/ toggleBlockComment : Ctrl-Shift-/ modifyNumberUp : Ctrl-Shift-Up modifyNumberDown : Ctrl-Shift-Down replace : Ctrl-H undo : Ctrl-Z redo : Ctrl-Shift-Z|Ctrl-Y copylinesup : Alt-Shift-Up movelinesup : Alt-Up copylinesdown : Alt-Shift-Down movelinesdown : Alt-Down del : Delete backspace : Shift-Backspace|Backspace cut_or_delete : Shift-Delete removetolinestart : Alt-Backspace removetolineend : Alt-Delete removewordleft : Ctrl-Backspace removewordright : Ctrl-Delete outdent : Shift-Tab indent : Tab blockoutdent : Ctrl-[ blockindent : Ctrl-] transposeletters : Ctrl-T touppercase : Ctrl-U tolowercase : Ctrl-Shift-U expandtoline : Ctrl-Shift-L addCursorAbove : Ctrl-Alt-Up addCursorBelow : Ctrl-Alt-Down addCursorAboveSkipCurrent : Ctrl-Alt-Shift-Up addCursorBelowSkipCurrent : Ctrl-Alt-Shift-Down selectMoreBefore : Ctrl-Alt-Left selectMoreAfter : Ctrl-Alt-Right selectNextBefore : Ctrl-Alt-Shift-Left selectNextAfter : Ctrl-Alt-Shift-Right splitIntoLines : Ctrl-Alt-L alignCursors : Ctrl-Alt-A findAll : Ctrl-Alt-K showKeyboardShortcuts : Ctrl-Alt-H
Online Java — IDE, Code Editor, Compiler
Online Java is a web-based tool powered by ACE code editor. Build, Run & Share Java code online using online-java’s IDE for free. It’s one of the quick, robust, powerful online compilers for java language. Don’t worry about setting up java environment in your local. Now Run the java code in your favorite browser instantly. Getting started with this editor is so easy and fast. Just write the program and click the RUN button!! Code can be saved online by using the SHARE option that enables you to access your code anywhere using internet.
What is Java?
Java is a popular general-purpose programming language which was originally developed by James Gosling at Sun Microsystems (later acquired by Oracle). Java is fast, secure, and reliable. It is widely used for developing desktop and mobile applications, embedded systems, game consoles, supercomputers, big data processing, and so on. According to Oracle, Java runs on 3 billion devices worldwide, which makes it one of the most popular programming languages.
Why learn Java?
- Web-based Applications
- Mobile App Development
- Desktop GUI Applications
- Gaming Applications
- Big Data Technologies
- Distributed Applications
- Cloud-Based Applications
- IoT Applications
Features of this tool
- Simple & Clean Design, Lightweight, Easy & Fast
- Interactive program execution which makes the user to give program inputs at real time
- Helpful for beginners to learn and practice programs
- Dark & Light theme options and customizable code editor with more themes
- Options to Copy or Download the Output of the Program
- Expandable Output Terminal
- Coding sharing option helps you to save your code in cloud so that it can be accessed anytime and anywhere with internet
Learn Other Programming Language?
Visit online-ide.com to learn and practice top programming languages — C, C++, Java, Python, Ruby, PHP, R, GoLang
Java online compiler
Write, Run & Share Java code online using OneCompiler’s Java online compiler for free. It’s one of the robust, feature-rich online compilers for Java language, running the Java LTS version 17. Getting started with the OneCompiler’s Java editor is easy and fast. The editor shows sample boilerplate code when you choose language as Java and start coding.
Taking inputs (stdin)
OneCompiler’s Java online editor supports stdin and users can give inputs to the programs using the STDIN textbox under the I/O tab. Using Scanner class in Java program, you can read the inputs. Following is a sample program that shows reading STDIN ( A string in this case ).
import java.util.Scanner; class Input < public static void main(String[] args) < Scanner input = new Scanner(System.in); System.out.println("Enter your name: "); String inp = input.next(); System.out.println("Hello, " + inp); >>Adding dependencies
OneCompiler supports Gradle for dependency management. Users can add dependencies in the build.gradle file and use them in their programs. When you add the dependencies for the first time, the first run might be a little slow as we download the dependencies, but the subsequent runs will be faster. Following sample Gradle configuration shows how to add dependencies
apply plugin:'application' mainClassName = 'HelloWorld' run < standardInput = System.in >sourceSets < main < java < srcDir './' >> > repositories < jcenter() >dependencies < // add dependencies here as below implementation group: 'org.apache.commons', name: 'commons-lang3', version: '3.9' >About Java
Java is a very popular general-purpose programming language, it is class-based and object-oriented. Java was developed by James Gosling at Sun Microsystems ( later acquired by Oracle) the initial release of Java was in 1995. Java 17 is the latest long-term supported version (LTS). As of today, Java is the world’s number one server programming language with a 12 million developer community, 5 million students studying worldwide and it’s #1 choice for the cloud development.
Syntax help
Variables
short x = 999; // -32768 to 32767 int x = 99999; // -2147483648 to 2147483647 long x = 99999999999L; // -9223372036854775808 to 9223372036854775807 float x = 1.2; double x = 99.99d; byte x = 99; // -128 to 127 char x = 'A'; boolean x = true;Loops
1. If Else:
When ever you want to perform a set of operations based on a condition If-Else is used.
if(conditional-expression) < // code >else < // code >2. Switch:
Switch is an alternative to If-Else-If ladder and to select one among many blocks of code.
3. For:
For loop is used to iterate a set of statements based on a condition. Usually for loop is preferred when number of iterations is known in advance.
for(Initialization; Condition; Increment/decrement) < //code >4. While:
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
5. Do-While:
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
Classes and Objects
Class is the blueprint of an object, which is also referred as user-defined data type with variables and functions. Object is a basic unit in OOP, and is an instance of the class.
How to create a Class:
class keyword is required to create a class.
Example:
How to create a Object:
How to define methods in a class:
public class Greeting < static void hello() < System.out.println("Hello.. Happy learning!"); >public static void main(String[] args) < hello(); >>Collections
Collection is a group of objects which can be represented as a single unit. Collections are introduced to bring a unified common interface to all the objects.
Collection Framework was introduced since JDK 1.2 which is used to represent and manage Collections and it contains:
This framework also defines map interfaces and several classes in addition to Collections.
Advantages:
- High performance
- Reduces developer’s effort
- Unified architecture which has common methods for all objects.