Question

My file name is Temp.java and inside it I have this. I’m using eclipse IDE

/*package*/ class Test {
    public static void main(String args[]) {
        System.out.println("test");
    }
}

So I was unable to run this as java application. I change my class name to Temp

class Temp {
 ....
}

Now I can. Can someone explain me why ?

Answer 1

This is probably a limitation of Eclipse. The code runs well from command line.

As I understand, you are trying to embed your unit tests in the same file with the class under test. This is a nice idea and I totally concur with it. You can read more about how you can succeed in Ben J. Christensen’s blog post. Generally, he suggests placing the tests in a static inner class, not a standalone class in the same file.

An example from the Netflix Hystrix framework: HystrixCircuitBreaker.UnitTest