
Explanation of Solution
Justification:
If two buttons are placed in the northern position of the border layout then the second button that is added only displayed.
Code:
import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
//class definition
publicclass SwingDemo
{
//main method
publicstaticvoid main(String[] args)
{
//create the button1
JButton button = new JButton("Button1!");
//create the button2
JButton button1 = new JButton("Button2!");
//define the panel
JPanel bottomPanel = new JPanel(new BorderLayout());
//add the buttons
bottomPanel.add(button, BorderLayout.NORTH);
bottomPanel.add(button1, BorderLayout.NORTH);
//set the main panel
JPanel mainPanel = new JPanel(new BorderLayout());
//add the components
mainPanel...

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