MainFrame.java

package newPanel;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

public class MainFrame extends JFrame{
    final private Font mainFont = new Font("Segoe print", Font.BOLD, 18);
    JTextField tfFirstName, tfLastName;
    JLabel lbWelcome;

    public void initialize(){
        //Form Panel
        JLabel lbFirstName = new JLabel("First Name");
        lbFirstName.setFont(mainFont);

        tfFirstName = new JTextField();
        tfFirstName.setFont(mainFont);

        JLabel lbLastName = new JLabel("Last Name");
        lbLastName.setFont(mainFont);

        tfLastName = new JTextField();
        tfLastName.setFont(mainFont);

        JPanel formPanel = new JPanel();
        formPanel.setLayout(new GridLayout(4, 1, 5, 5));
        formPanel.add(lbFirstName);
        formPanel.add(tfFirstName);
        formPanel.add(lbLastName);
        formPanel.add(tfLastName);
        
        //Welcome label
        lbWelcome = new JLabel();
        lbWelcome.setFont(mainFont);

        //Buttons Panel
        JButton btnOK = new JButton("OK");
        btnOK.setFont(mainFont);
        btnOK.addActionListener(new ActionListener(){

            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub
                
                String firstName = tfFirstName.getText();
                String lastName = tfLastName.getText();
                lbWelcome.setText("Hello "+ firstName +" "+ lastName);
            }

            
        });

        JButton btnClear = new JButton("Clear");
        btnClear.setFont(mainFont);
        btnClear.addActionListener(new ActionListener(){

            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub
                tfFirstName.setText("");
                tfLastName.setText("");
                lbWelcome.setText("");
            }
            
        });

        JPanel buttonsPanel = new JPanel();
        buttonsPanel.setLayout(new GridLayout(1, 2, 5,5));
        buttonsPanel.add(btnOK);
        buttonsPanel.add(btnClear);

        JPanel mainPanel = new JPanel();
        mainPanel.setLayout(new BorderLayout());//BorderLayout divides the panel into 5 parts: north,sout,east,west and center.
        mainPanel.setBackground(new Color(128,128,255));
        mainPanel.add(formPanel,BorderLayout.NORTH);
        mainPanel.add(lbWelcome,BorderLayout.CENTER);
        mainPanel.add(buttonsPanel,BorderLayout.SOUTH);

        add(mainPanel);

        setTitle("Welcome");
        setSize(500,600);
        setMinimumSize(new Dimension(300,400));
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setVisible(true);
    }

    public static void main(String args[]){
        MainFrame myFrame = new MainFrame();
        myFrame.initialize();
    }
}