java,枯燥中遇见美丽JFrame，窗体（边界布局）

package com.company;

import javax.swing.*;
import javax.swing.plaf.basic.BasicOptionPaneUI;
import java.awt.*;

public class Main extends JFrame {
    Main(){
        setBounds(100,100,350,200);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        Container c=getContentPane();
        c.setLayout(new BorderLayout());//设置为边界布局
        JButton b1=new JButton("中"),//为边界起名字
                b2=new JButton("西"),
                b3=new JButton("东"),
                b4=new JButton("南"),
                b5=new JButton("北");

        c.add(b1,BorderLayout.CENTER);//中部添加按钮
        c.add(b2,BorderLayout.EAST);
        c.add(b3,BorderLayout.WEST);
        c.add(b4,BorderLayout.SOUTH);
        c.add(b5,BorderLayout.NORTH);

        setVisible(true);
    }

    public static void main(String[] args) {
        new Main();
    // write your code here
    }
}