为什么这个代码不运行?

Question

package a1;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

public class JLabel01 extends JFrame implements ActionListener{
    JLabel a1;//图像标签
    JLabel a2;//文本标签
    JPanel b1;//面板
    JButton c1;//按钮
    public JLabel01(String name){
        super(name);
        this.c1=new JButton("标签测试");//设置按钮
        this.a1=new JLabel("显示图像");//设置图像标签
        this.a2=new JLabel("显示文本");//设置文本标签
        this.b1=new JPanel();
        b1.add(a1);//把图像标签加入面板
        b1.add(a2);//把文本标签加入面板
        b1.add(c1);//把按钮加入面板
        this.add(b1);
        this.setBounds(500,200,300,300);
        c1.addActionListener(this);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setVisible(true);
    }
    public void actionPerformed(ActionEvent e){
        ImageIcon d1=new ImageIcon(getClass().getResource("C:/Users/admin/Pictures/Nitro/Nitro_Wallpaper_5000x2813.jpg"));
        this.a1.setText(null);
        this.a1.setIcon(d1);
        this.a2.setText("文本修改");
    }
    public static void main(String args){
        new JLabel01("标签演示框架");
    }
}

Answer 1

new JLabel().show()