Run single java file with standard main(String [] args) method - Android Studio

Question

To start with - Yes, I know that this is crazy/strange. But I need it :).

I want to find simpliest way to run single java file (and prefer non-terminal answers :) - if they are possible ) in Android Studio. I mean random .java file from my Android project in which I'll write main(..) method. And there's one more thing: I don't want to create any new modules (I've already seen answers about adding Java library module). I just want to click something and run my (single) file, the same way as I can do it in Eclipse. Is it possible?

Just create the class with the main method, right click and "Run 'your class'" i use intellij idea and should be the same in android studio. — Ringo, Nov 25 '14 at 21:55
Ok it works - but as I see only when my project is well build - because this method invokes some gradle tasks. (I even tried it earlier - but on project with some errors and then it didn't work). Anyway - do I really need to run gradle to print "Hello world" on terminal :) ? — Mkr, Nov 25 '14 at 22:09

score 20 · Answer 1 · edited Oct 01 '17 at 11:12

20

One thing that might be confusing you, like it was confusing me:

If there is the standard method to start Java application

public static void main (String[] args ) {
// your block here

}

Android Studio will automatically give an option "Run YourClass.mainActivity()", when you right-click anywhere in the editor's editing space.

Just right click in the Java file and there will be an option to run that particular Java class.

edited Oct 01 '17 at 11:12

halfer

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answered Dec 27 '15 at 05:09

erluxman

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8

This does not work. Gradle tries to build project and fails. – Sep 20 '18 at 17:27

score 11 · Accepted Answer · answered Nov 25 '14 at 21:59

11

If nothing else, you can make a quick JUnit test that calls your class's main method.

answered Nov 25 '14 at 21:59

Ross Hambrick

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Thanks for answer. I didn't think about that because I just wanted to fast test something small inside my files, but you partially solved my problem the same as luisdurazoa and you get +25. – Mkr Nov 25 '14 at 22:31

kevinweber · Answer 3 · 2015-11-16T03:41:23.443

11

The easiest way (for me) is to do a right click in your editor and select "Run ClassName.main()". See screenshot. Using Android Studio version 1.4.1.

edited Nov 16 '15 at 03:41

answered Nov 16 '15 at 03:34

kevinweber

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score 8 · Answer 4 · edited Sep 30 '21 at 17:56

8

Create the class with main() method:

public class Test1 {

  public static void main(String[] args) {
    System.out.println("hello1");
  }
}

Hit ctrlshiftF10 (or ctrlshiftR for Mac)

It will compile, assemble and print hello1

edited Sep 30 '21 at 17:56

RustyTheBoyRobot

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answered Jan 28 '16 at 14:42

Andrew

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score 3 · Answer 5 · answered Sep 30 '21 at 15:33

3

Solution:

Execute run * * main() with coverage;
Modify gradle.xml under. Idea

< GradleProjectSettings> Add a row under the label node

< option name=”delegatedBuild” value=”false” />

https://programmerah.com/tag/android/page/2/

answered Sep 30 '21 at 15:33

mostafa ahmadi

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3

It might be better to add the image from that post to help explain your solution. – RustyTheBoyRobot Sep 30 '21 at 18:05

Ta0Ta0Ta0 · Answer 6 · 2021-12-15T08:09:15.890

Solution：

1.Create a java class in any package of your project with Android Studio.
2.Provide a main() method：

    package com.example.demo;

    public class test {
        public static void main(String[] args) {
            System.out.println("hello,java");
        }
    }

3.Avoid use targetSdk 31 in build.gradle:

    defaultConfig {
        applicationId "com.example.demo"
        minSdk 28
        targetSdk 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

4.Configure /${yourproject}/.idea/gradle.xml:

<GradleProjectSettings>
        <option name="delegatedBuild" value="false" />
        ....
</GradleProjectSettings>

5.Sync your project with Gradle Files;
6.Last,you can Run single java.

As it’s currently written, your answer is unclear. Please [edit] to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers [in the help center](/help/how-to-answer). — Community, Dec 13 '21 at 06:29

score 1 · Answer 7 · answered Aug 12 '19 at 11:19

This may be too late but this might help other developers,

If you're using JAVA, you need to write it as told by @Andrey.

If you're using Kotlin, you can simply write a function without making a Class.

fun main(){
     println("you")
}

This will work.

But, remember, function name should only be main and don't use anything that is part of Android JDK inside this main function.

Ex:- if you write

fun main(){
   Log.e("you","you")
}

Now as Log is part of Android, you'll get runtime exception saying

Exception in thread "main" java.lang.RuntimeException: Stub!

Run single java file with standard main(String [] args) method - Android Studio

7 Answers7

Solution：

Linked

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