Desktop Application Development

According to your question, which is not very informative.

A little guideance:

1. you need a class

e.g.

public class MyApp ()
{

}

2. main method for starting

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

    }
}

3. a Frame, without a Frame there will be nothing !

public class MyApp ()
{
    //Our frame
    JFrame myFrame;
    public static void main(String args[])
    {
        
    }
}

4. constructor for the app and init in it

public class MyApp ()
{
    //Our frame
    JFrame myFrame;
    public static void main(String args[])
    {
        //Creating myApp class
        new myApp();
    }

    //Constructor for my app
    public MyApp()
    {
        //creating Frame;
        myFrame = new JFrame("MyApp");
    }
}

5. A button and a wait Operation and the window size

public class MyApp ()
{
    //Our frame
    JFrame myFrame;
    public static void main(String args[])
    {
        //Creating myApp class
        new myApp();
        //wait Operation (is this correct for Java)? 
        while(System.out.readln())
        {
        }
    }

    //Constructor for my app
    public MyApp()
    {
        //creating Frame;
        myFrame = new JFrame("MyApp");
        //Setting size
        myFrame.setPreferredSize(new Dimension(800,600));
        //creating Button
        Button myButton = new Button("Button");
        //adding button to Frame
        myFrame.add(button);
        //set button and Frame visible
        myFrame.setVisible(true);
        button.setVisible(true);
    }
}

If i missed nothing, i actually had no Java IDE at Hand,
this code should work and Display a Screen with a button.

hope this is what you'd asked :)