java 图形用户界面设计

=======运行前还好好的，运行后就会莫名弹出一个Monitor类出来，明明已经写了啊======

img

img

=========源码==========
package com.hspedu.hlxy;

import javax.swing.;
import java.awt.;
import java.awt.event.*;

public class CopyTest extends JFrame {
int num;
JButton bA = new JButton("获取一个随机数");
JButton bB = new JButton("确认");
JTextField display = new JTextField("", 10);
JLabel Lspac1 = new JLabel("请输入你猜测的值:");
JLabel Lspac2 = new JLabel();
JLabel Lspac3 = new JLabel();
JPanel pnlFoot = new JPanel(new FlowLayout());

public void init() {
    Font font = new Font("宋体", Font.PLAIN, 32);
    setSize(500, 500);
    bA.setFont(font);
    bB.setFont(font);
    Lspac1.setFont(font);
    Lspac2.setFont(font);
    display.setFont(font);
    bA.addActionListener(new Monitor());
    bB.addActionListener(new Monitor());
    pnlFoot.add(bA);
    pnlFoot.add(bB);
    setLocationRelativeTo(null);
    setLayout(new GridLayout(5, 1, 10, 10));
    add(Lspac1);
    add(display);
    add(Lspac2);
    add(pnlFoot);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setVisible(true);
}


class Monitor implements ActionListener {
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == bA) {
            num = (int) (Math.random() * 10) + 1;
        }

        if (e.getSource() == bB) {
            int num2 = Integer.valueOf(display.getText());
            if (num <= 0) JOptionPane.showMessageDialog(null, "请点击随机数");
            if (num2 < num) {
                JOptionPane.showMessageDialog(null, "小了");
                display.setText("");
            }
            if (num2 > num) {
                JOptionPane.showMessageDialog(null, "大了");
                display.setText("");
            }
            if (num2 == num) {
                JOptionPane.showMessageDialog(null, "正确，答案就是:" + num);
                display.setText("");
                num = -1;
            }
        }
    }
}

public static void main(String[] args) {
    CopyTest f = new CopyTest();
    f.init();
}

}

这是因为运行时，idea会将你项目里所有文件都编译一遍，这个类编译不过，你如果暂时用不到这个类可以把这个类移出项目，或者全注释掉

你在monitor类里面没声明bA和bB啊