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);
     }
 }