java jframe最da化代码_Java Swing - 如何更新JFrame最大化边界，同时保持最大化

import java.awt.BorderLayout;

import java.awt.Rectangle;

import java.awt.event.ActionEvent;

import javax.swing.AbstractAction;

import javax.swing.JButton;

import javax.swing.JFrame;

public class Main {

public static void main(String[] args) {

JFrame frame = new JFrame() {

@Override

public synchronized void setExtendedState(int state) {

if (isUndecorated() && (state & MAXIMIZED_BOTH) == MAXIMIZED_BOTH) {

super.setMaximizedBounds(new Rectangle(300, 300));

}

super.setExtendedState(state);

}

};

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setSize(800, 600);

frame.setUndecorated(true);

frame.getContentPane().add(

new JButton(new AbstractAction("Toggle maximize") {

@Override

public void actionPerformed(ActionEvent e) {

int state = frame.getExtendedState();

if ((state & JFrame.MAXIMIZED_BOTH) == JFrame.MAXIMIZED_BOTH) {

frame.setExtendedState(JFrame.NORMAL);

} else {

frame.setExtendedState(JFrame.MAXIMIZED_BOTH);

}

}

}), BorderLayout.PAGE_END);

frame.setVisible(true);

}

}