java - Design JFrame with mounting multiples JPanels?

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I'm new java GUI developer and I have
a question.

Is possible to create a Jframe with
multiples Jpanels? My idea is create a class with the components added in the JPanel and
from another class create the JFrame adding multiples objects of the JPanel
Class.

At the moment I'm doing
test:

public class Principal
            {

 private JFrame window;

 public
            Principal(){

 window = new JFrame("Principal"); 

            }


 /**
 * @return the finestra

            */
 public JFrame getFinestra() {
 return window;

            }
}`

Child
Class

public class
            Childs {

 private JPanel panel;
 private JLabel
            text1;

 public Childs(){
 panel = new
            JPanel();
 text1 = new JLabel();



            text1.setText("TEXT");
 panel.add(text1);
 }


            /**
 * @return the panel
 */
 public JPanel getPanel()
            {
 return panel;


            }
}

TestFrame
Class

public class
            TestFrame {

 /**
 * @param args the command line
            arguments

 */
 public static void main(String[] args)
            {

 Principal p = new Principal();
 Childs c = new
            Childs();
 Childs c2 = new Childs();


            p.getFinestra().add(c.getPanel());

            p.getFinestra().add(c2.getPanel());

            p.getFinestra().setVisible(true);


            }
}
`

Answer

It is certainly possible to have multiple
JPanels in a JFrame. You can get the component Container from
the JFrame with getContentPane(), which in your example would
work as

p.getFinestra().getContentPane();

To
understand how to place your JPanels to the
JFrame, you should study some Layouts.
Here is a good resource and this site has many more: href="https://docs.oracle.com/javase/tutorial/uiswing/layout/index.html"
rel="nofollow">https://docs.oracle.com/javase/tutorial/uiswing/layout/index.html

For
example to use a FlowLayout (the default
one)

p.getFinestra().getContentPane().setLayout(new
            FlowLayout());
p.getFinestra().getContentPane().add(c);
p.getFinestra().getContentPane().add(c2);

//It
            is also a good habit to call pack() before setting to
            visible
p.getFinestra().pack()

p.getFinestra().setVisible(true);

And
as a short lesson in English, the plural of child is
children.