Instantiation « main class « Java Class Q&A

1. When doing small, single class programs should I make everything static or or instantiate a copy of itself in main?    stackoverflow.com

When I'm working on homework assignments for class it is typically beneficial if the programs are small to keep the problem to a single class (easy to submit with our script). For ...

2. Instantiating object from inside the main of that class in Java    stackoverflow.com

I was looking through my OOP class documentation and I found this example:

class Student {
    private String name;
    public int averageGrade;


    public ...

3. main driver class to instantiate my child classes    coderanch.com

im writting a program with an abstract class called shape. then i will write child classes of circle, square..and etc. .....im supposed to then write a main driver class that instantiate my child classes and exercise the behaviors i provide.........the behaviors are just area and circumference of each shape......im confused on the main driver class.....how do i use the driver class ...

4. Can a class be instantiated outside main() ?    coderanch.com

I am trying following code import java.util.*; import java.io.*; public class CollectionEx{ Hashtable t = new Hashtable(); t.put("one", new Integer(1)); t.put("two", new Integer(2)); t.put("three", new Integer(3)); Integer n = (Integer)t.get("one"); if (n != null){ System.out.println("one = " + n); } } I am getting 24 errors. When I instantiate Hashtable in the main(), it compiles and runs. So can we not ...

5. Instantiating an class that has method main()    forums.oracle.com

So, I took a break from Java and started up again, this time with a new book. One of the examples they use is the one I have a question about- http://pastebin.com/jR2J5d2t Basically, the only class that's used, implements ActionListener, but also contains the main() method. Now, maybe I don't remember this exact technique in previous books I've read... But, is ...