Why Cant I Run a .JAVA file?

[DirtyKeyboard]

So I have a computer science class that we learn java in, but we use JCreator which is no longer available for download. When we make files in JCreator, we just right click, new, file, [name].java and start the program from complete scratch, and it runs just fine in JCreator, why can't I do that in Eclipse? I want to be able to just make a .java file from scratch and run it without making a whole Project file in my eclipse workspace, but when I try to do that, it brings up a window titled: Select what to run, and it shows me 2 options, Ant Build, and Ant Build with 3 dots at the end, either one I click I get an error saying: Error: Build Failed, Reason: unable to find an Ant Run File.

 

Is there any IDEs that will allow me to just make my own .JAVA files and not a whole project, or can I change my eclipse to allow me to just make my own .JAVA files?

[bleedblue]

Why don't you want to put it in a project? It's much cleaner that way.

[DirtyKeyboard]

3 minutes ago, bleedblue said:

Why don't you want to put it in a project? It's much cleaner that way.

Because I just want to make small files for testing out, that I will be deleting very often, and I'm not used to the whole project file thing it's weird, is there a way to disable it?

[bleedblue]

Just now, DirtyKeyboard said:

Because I just want to make small files for testing out, that I will be deleting very often, and I'm not used to the whole project file thing it's weird, is there a way to disable it?

Nope, unless you want to compile and run using command line. Just create an eclipse project called "Test". 

[DirtyKeyboard]

3 minutes ago, bleedblue said:

Nope, unless you want to compile and run using command line. Just create an eclipse project called "Test". 

But how come you can do it in JCreator?

[bleedblue]

4 minutes ago, DirtyKeyboard said:

But how come you can do it in JCreator?

I've never used JCreator in all my time spent as a Java dev. I asked around my team and no one else has used it either lol.

 

[DirtyKeyboard]

8 hours ago, bleedblue said:

I've never used JCreator in all my time spent as a Java dev. I asked around my team and no one else has used it either lol.

 

It’s probably because it uses a super old version of java and hasn’t updated

 

[TheKDub]

10 hours ago, DirtyKeyboard said:

So I have a computer science class that we learn java in, but we use JCreator which is no longer available for download. When we make files in JCreator, we just right click, new, file, [name].java and start the program from complete scratch, and it runs just fine in JCreator, why can't I do that in Eclipse? I want to be able to just make a .java file from scratch and run it without making a whole Project file in my eclipse workspace, but when I try to do that, it brings up a window titled: Select what to run, and it shows me 2 options, Ant Build, and Ant Build with 3 dots at the end, either one I click I get an error saying: Error: Build Failed, Reason: unable to find an Ant Run File.

 

Is there any IDEs that will allow me to just make my own .JAVA files and not a whole project, or can I change my eclipse to allow me to just make my own .JAVA files?

 

.java files are Java class files that haven't been compiled. If you want to be able to run a Java program, you're going to have to compile at least one class file into a .jar file.

 

In Eclipse, just make a project, (you don't have to do this, but it's a good idea) create a package, then create a class file (.java) inside of that package.

 

If you just want to test a single class file, you can do so within Eclipse.

[bleedblue]

1 hour ago, DirtyKeyboard said:

It’s probably because it uses a super old version of java and hasn’t updated

 

...then don't use it.

[0x21]

Install the JDK and you'll be able to compile the files yourself, without the need for a full-blown IDE.

[Guest]

Eclipse makes java soooo easy. 

[wasab]

20 hours ago, fpo said:

Eclipse makes java soooo easy. 

Hell no. Intellij makes Java easy because it literally writes 50% of the code for you. 

[wasab]

You don't need any ide. You can just use a text editor, write your code, name it .java and then use javac to compile it to jar and use Java command to execute the jar program. 

 

 

[Fetzie]

On 14/09/2018 at 6:02 AM, DirtyKeyboard said:

So I have a computer science class that we learn java in, but we use JCreator which is no longer available for download. When we make files in JCreator, we just right click, new, file, [name].java and start the program from complete scratch, and it runs just fine in JCreator, why can't I do that in Eclipse? I want to be able to just make a .java file from scratch and run it without making a whole Project file in my eclipse workspace, but when I try to do that, it brings up a window titled: Select what to run, and it shows me 2 options, Ant Build, and Ant Build with 3 dots at the end, either one I click I get an error saying: Error: Build Failed, Reason: unable to find an Ant Run File.

 

Is there any IDEs that will allow me to just make my own .JAVA files and not a whole project, or can I change my eclipse to allow me to just make my own .JAVA files?

I mean, all that JCreator is presumably doing, is the following:

 

Assuming we have a class called HelloWorld (you can do this in any text editor, just need to name it {className}.java)

HelloWorld.java:
class HelloWorld{

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

We compile it:

tom@TOMS-PC:~# javac HelloWorld.java

And run it

tom@TOMS-PC:~# java HelloWorld
hello world

 

Your IDE is basically doing nothing else.

 

Do you have this option in Eclipse when you right-click your main class (the .java file in the package explorer)?

 

If not, go to the "run configuration" menu entry and then create a new run configuration -> java application -> select your main class -> accept -> run

 

Now you'll have this option to run as java application in the "run" menu. Or you can click the green "play" button in the action bar. Up to you, really.

 

[wasab]

6 hours ago, Fetzie said:

I mean, all that JCreator is presumably doing, is the following:

 

Assuming we have a class called HelloWorld (you can do this in any text editor, just need to name it {className}.java)

HelloWorld.java:
class HelloWorld{

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

We compile it:

tom@TOMS-PC:~# javac HelloWorld.java

And run it

tom@TOMS-PC:~# java HelloWorld
hello world

 

Your IDE is basically doing nothing else.

 

Do you have this option in Eclipse when you right-click your main class (the .java file in the package explorer)?

 

If not, go to the "run configuration" menu entry and then create a new run configuration -> java application -> select your main class -> accept -> run

 

Now you'll have this option to run as java application in the "run" menu. Or you can click the green "play" button in the action bar. Up to you, really.

 

Yeah, if you check the project folder in the ide, you can actually see a jar file which is built every time when you run the .java file