How to fix error in GridLayout/GridBagConstraints?

KvaksMan play :

Why GridLayot not working in Swing Java?

I need to place element at concrete cell, but they placing wrong (picture)

How to place elements to concrete cell in Java Swing with grid layout?

My code:

package com.KvaksManYT;

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

public class GUI extends JFrame {
    public GUI() {
        super("Test");
        setBounds(100, 100, 250, 100);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Container container = this.getContentPane();
        container.setLayout(new GridLayout(3, 2, 2, 2));
        container.add(but1, onPosition(1, 2));
        container.add(but2, onPosition(2, 2));
        container.add(but3, onPosition(1, 1));
        container.add(but4, onPosition(2, 1));
    }

    private JButton but1 = new JButton("Press 1");
    private JButton but2 = new JButton("Press 2");
    private JButton but3 = new JButton("Press 3");
    private JButton but4 = new JButton("Press 4");

    private GridBagConstraints onPosition(int x, int y) {
        GridBagConstraints layConstraints = new GridBagConstraints();
        layConstraints.fill = GridBagConstraints.BOTH;
        layConstraints.gridx = x;
        layConstraints.gridy = y;
        return layConstraints;
    }
}

Andrew Thompson :

The GridBagConstraints is used for Grid Bag Layout, rather than Grid Layout.

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