.app2

package frameApp;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Main {
    public static void main(String [] args){
        SimpleGUI app = new SimpleGUI();
        app.setVisible(true);
    }
    
}

public class SimpleGUI extends JFrame {
    private JButton button = new JButton("Press");
    private JTextField input = new JTextField("", 5);
    private JLabel label = new JLabel("Input: ");
    
    private JRadioButton radio1 = new JRadioButton("Select this");
    private JRadioButton radio2 = new JRadioButton("Select that");
    private JCheckBox check = new JCheckBox("Check", false);
    
    public SimpleGUI (){
        super("Simple Instance");
        this.setBounds(200,200,300,200);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        Container container = this.getContentPane();
        container.setLayout(new GridLayout(3,2,2,2));
        container.add(label);
        container.add(input);
        
        ButtonGroup group = new ButtonGroup();
        group.add(radio1);
        group.add(radio2);
        container.add(radio1);
        radio1.setSelected(true);
        container.add(radio2);
        container.add(check);
        button.addActionListener(new ButtonEventListener ());
        container.add(button);
        
        
        
        
    }
    
    class ButtonEventListener implements ActionListener {
        public void actionPerformed (ActionEvent e){
            String message = "";
            message += "Button was pressed \n";
            message += "Text is " + input.getText() + "\n";
            message += (radio1.isSelected() ? "Radio #1" : "Radio #2") + "is selected \n";
            message += "CheckBox is " + ((check.isSelected()) ? "checked" : "unchecked");
            JOptionPane.showMessageDialog(null, message, "Output", JOptionPane.PLAIN_MESSAGE);
        }
    }
}