JFrame，试图让button运行另一个类

我想做的就是做一个自定义安装程序，我有按钮，工作正常，但我想运行另一个类称为CopyDir.java，当我点击按钮，以便它复制必要的文件到正确的目录。问题是，我对如何做到这一点有点困惑。

public class Frame extends JFrame implements ActionListener {
JPanel pane = new JPanel();
JButton PC = new JButton("Install Mod (PC)");
JButton Steam = new JButton("Install Mod (Steam)");
JLabel Text = new JLabel("Welcome to the BTD 5 Mod Installer");
JLabel Text2 = new JLabel("Click on the button that matches your version of BTD 5");
JLabel Text3 = new JLabel("To install it for the version that you are using");
JLabel Text4 = new JLabel("© Nixxx60/Nanikos");
Frame() {
    super("BTD 5 Mod Installer");
    setBounds(100, 100, 400, 150);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container con = this.getContentPane();
    con.add(pane);
    PC.setMnemonic('P');
    PC.addActionListener(this);
    pane.add(PC);
    PC.requestFocus();
    con.add(pane);
    Steam.setMnemonic('P');
    Steam.addActionListener(this);
    pane.add(Steam);
    Steam.requestFocus();
    setVisible(true);
    pane.add(Text);
    pane.add(Text2);
    pane.add(Text3);
    pane.add(Text4);
}
public void actionPerformed(ActionEvent event) {
    Object source = event.getSource();
    if (source == PC) {
        JOptionPane.showMessageDialog(null, "Mod has been installed on PC/Cracked Edition!", "BTD 5 Installer",
            JOptionPane.PLAIN_MESSAGE);
        setVisible(true);
    }
    if (source == Steam) {
        JOptionPane.showMessageDialog(null, "Mod has been installed for Steam Edition!", "BTD 5 Installer",
            JOptionPane.PLAIN_MESSAGE);
        setVisible(true);
    }
}
public static void main(String args[]) {
    new Frame();
}
}

还有，这里是"CopyDir.java"类的代码。

package Nanikos.BTD5.Main;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
public class CopyDir {
    public static void main(String args[]) throws Exception
    {
        copyFiles(new File("C:\Users\User\Desktop\BTD5 Mod Installer\Mod Files\PC Assets"),new File("C:\Program Files (x86)\Steam\steamapps\common\BloonsTD5"));
        System.out.println("Files Copied");
    }
    public static void copyFiles(File src,File des) throws Exception
    {
        if(src.isDirectory())
        {
            if(!des.exists()) des.mkdir();
            String [] filePaths=src.list();
            for(String filePath: filePaths)
            {
                File srcFile =new File(src, filePath);
                File desFile =new File(des, filePath);
                copyFiles(srcFile,desFile);
            }
        }
        else
        {
            FileInputStream from =null;
            FileOutputStream to =null;
            from = new FileInputStream(src);
            to = new FileOutputStream(des);
            byte [] buffer=new byte[4096];
            int byteReads;
            while( (byteReads=from.read(buffer))!=-1 )
            {
                to.write(buffer,0,byteReads);
            }
            from.close();
            to.close();
        }
    }
}