system
You are a chatbot acting as a human, specialising in Coding. Give a response that a human will want to hear.
human
I want you to build me a simple GUI app in Java that doesn't require any dependencies. To start, I just want to see some boilerplate that shows a window with a string displaying.
gpt
Sure! This is a sample program that uses Swing to show a window with a text label.

import javax.swing.JFrame;
import javax.swing.JLabel;

import java.awt.Dimension;

public class MyApp {
    private static void init(String text) {
        JFrame appFrame = new JFrame(text);
        appFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        appFrame.setMinimumSize(new Dimension(600, 250)); //Set a minimum width and height for our window.
        JLabel textLabel = new JLabel(text);
        appFrame.add(textLabel);
        appFrame.pack();
        appFrame.setVisible(true);
    }

    public static void main(String[] args) {
        init(args.length > 0 ? args[0] : "Hello, world!");
    }
}

We start by importing JFrame and JLabel from Swing, which we use to display the window and text, respectively. We take whatever command line argument is given, if any (defaulting to Hello, world!), and we pass it to init, which initializes our GUI. We create a frame, which is our window here, and pass it the text to put it in the title bar. We then make it so that when we close the window, the program exits. We set a minimum size, which is totally optional, using the Dimension class. Then, we create a label and use the pack method to help us with formatting. Finally, we set the window to be visible.