Help with Java code.

I am trying to do a multiplication table. But I cannot get it to work. I don't really know the code for it.

This is what I have so far...

  Code:

package Unit1;
import java.util.Scanner;

public class Multiplication_Table {

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

Oh and...I need someone to check this for me. Tell me if it gives out random boxes? Please and thank you.

  Code:

package Unit1;
import javax.swing.*;
import java.awt.*;

public class GUIWindow {

public static void main(String [] args){   
   JFrame theGUI = new JFrame();
   theGUI.setTitle("Random Boxes");
   theGUI.setSize(350, 400);
   theGUI.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JPanel panel1 = new JPanel();
   panel1.setBackground(Color.cyan);
   JPanel panel2 = new JPanel();
   panel2.setBackground(Color.blue);
   JPanel panel3 = new JPanel();
   panel3.setBackground(Color.red);
   JPanel panel4 = new JPanel();
   panel4.setBackground(Color.black);
   Container pane = theGUI.getContentPane();
   pane.setLayout(new GridLayout(2, 2));
   pane.add(panel1);
   pane.add(panel2);
   pane.add(panel3);
   pane.add(panel4);
   theGUI.setVisible(true);



}
}

Thank you.