Java Insets获取窗口的顶、底、左、右的大小

import java.awt.Insets;

import javax.swing.JFrame;

public class NewFrame {
    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setSize(500, 500);
        frame.setVisible(true);
        
        Insets insets = frame.getInsets();  
        System.out.println(insets.top);
        System.out.println(insets.bottom);
        System.out.println(insets.left);
        System.out.println(insets.right);
    }
}

import java.awt.Insets;

import javax.swing.JFrame;

public class NewFrame extends JFrame {
    
    public void launchFrame() {
        this.setSize(500, 500);
        this.setLocation(300, 300);
        this.setVisible(true);
    }
    
    public static void main(String[] args) {
        NewFrame nf = new NewFrame();
        nf.launchFrame();
        
        Insets insets = nf.getInsets();
        System.out.println(insets.top);
        System.out.println(insets.bottom);
        System.out.println(insets.left);
        System.out.println(insets.right);
    }
}