Java Swing - 如何获取JFrame窗口大小信息

import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Rectangle;

import javax.swing.JFrame;

public class Main {
  public static void main(String[] args) {
    GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
    Rectangle bounds = env.getMaximumWindowBounds();
    System.out.println("Screen Bounds: " + bounds);

    GraphicsDevice screen = env.getDefaultScreenDevice();
    GraphicsConfiguration config = screen.getDefaultConfiguration();
    System.out.println("Screen Size  : " + config.getBounds());

    JFrame frame = new JFrame("Frame Info");
    System.out.println("Frame Insets : " + frame.getInsets());

    frame.setSize(200, 200);
    System.out.println("Frame Insets : " + frame.getInsets());
    frame.setVisible(true);

    System.out.println("Frame Size   : " + frame.getSize());
    System.out.println("Frame Insets : " + frame.getInsets());
    System.out.println("Content Size : " + frame.getContentPane().getSize());
  }
}