GridBagLayout в JPanel (я новичок)

import javax.swing.*;
import java.awt.*;
import java.awt.datatransfer.DataFlavor;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetDropEvent;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
 
public class GUIForCipher extends JFrame {
 
    private Button encrypt = new Button("Encrypt");
    private Button decrypt = new Button("Decrypt");
 
    public GUIForCipher(String cipherName) {
        super(cipherName);
        super.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        super.setLocationByPlatform(true);
        super.setSize(400, 400);
        super.setResizable(false);
 
        super.setLayout(new GridBagLayout());
 
        super.add(encrypt,new GridBagConstraints(0,4,1,1,0,0,GridBagConstraints.NORTH,GridBagConstraints.HORIZONTAL,new Insets(1,2,2,2),0,0));
        super.add(decrypt,new GridBagConstraints(2,4,1,1,0,0,GridBagConstraints.NORTH,GridBagConstraints.HORIZONTAL,new Insets(1,2,2,2),0,0));
        JPanel leftPanel = new JPanel(new GridBagLayout());
        JPanel rightPanel = new JPanel(new GridBagLayout());
        leftPanel.setBorder(BorderFactory.createEtchedBorder());
        rightPanel.setBorder(BorderFactory.createEtchedBorder());
        leftPanel.setBackground(Color.WHITE);
        rightPanel.setBackground(Color.WHITE);
 
        JLabel leftPanelText = new JLabel("Input Files To Encrypt");
        leftPanelText.setFont(new Font("panelFont",Font.ITALIC,10));
        leftPanel.add(leftPanelText);
 
        JLabel rightPanelText = new JLabel("Input Files To Decrypt");
        rightPanelText.setFont(new Font("panelFont",Font.ITALIC,10));
        rightPanel.add(rightPanelText,new GridBagConstraints(0,0,0,0,0,0,GridBagConstraints.NORTH,GridBagConstraints.HORIZONTAL,new Insets(0,0,0,0),0,0));
 
        super.add(leftPanel, new GridBagConstraints(0,1,2,2,1,1,GridBagConstraints.NORTHWEST,GridBagConstraints.BOTH,new Insets(2,3,3,1),0,0));
        super.add(rightPanel,new GridBagConstraints(2,1,2,2,1,1,GridBagConstraints.NORTHEAST,GridBagConstraints.BOTH,new Insets(2,1,3,2),0,0));
 
    }
 
}