membuat JFrame

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

public class FIKS {
    public final static boolean RIGHT_TO_LEFT = false;

    public static void addComponentsToPane(Container contentPane) {
        if (RIGHT_TO_LEFT) {
            contentPane.setComponentOrientation(
                ComponentOrientation.RIGHT_TO_LEFT);
        }
//        Any number of rows and 2 columns
        contentPane.setLayout(new GridLayout(0,2));

        contentPane.add(new JLabel("JLabel 1"));
        contentPane.add(new JButton("JButton 2"));
        contentPane.add(new JCheckBox("JCheckBox 3"));
        contentPane.add(new JTextField("Long-Named JTextField 4"));
        contentPane.add(new JButton("JButton 5"));
        contentPane.add(new JRadioButton("RadioButton 6"));
       
    }

    private static void createAndShowGUI() {
        JFrame.setDefaultLookAndFeelDecorated(true);

        JFrame frame = new JFrame("Tugas Java");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Set up the content pane and components in GridLayout
        addComponentsToPane(frame.getContentPane());


        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}