使用Netbeans自动最大化窗口

import javax.swing.*;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class Main {
    public static void main(String[] args) {
        JFrame frame = new JFrame("自动最大化窗口");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(800, 600);
        frame.setLayout(new BorderLayout());
        frame.add(new JLabel("这是一个自动最大化的窗口", SwingConstants.CENTER));
        frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
        frame.setVisible(true);

        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowOpened(WindowEvent e) {
                frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
            }
        });
    }
}