Question

is there a way to declare 2 classes on the same .java file using Eclipse – also how the compiler will distinguish the .class for each declare class.

example

public class ThisTest
{
    public static void main(String[] args)
    {
    }
}

class SimpleArray
{

}

thank you for your time.

Answer 1

Yes, exactly like your example.

The extra class need to be non-public

You could also define inner/nested classes. In this case you should investigate the difference

Java inner class and static nested class

public class ThisTest
{
    public static void main(String[] args)
    {
    }


    static class SimpleArray
    {

    }

    class SimpleArray2 {}
}
class Buddy {}

Each class will be located in an own .class file in a directory similar to the package.
Nested classes get its host prefixed and separated by an ‘$’.
The above case results in four class files

• ThisTest.class
• ThisTest$SimpleArray.class
• ThisTest$SimpleArray2.class
• Buddy.class

Just check the bin or classes folder of your eclipse project.