java – 为什么一个程序为我编译,但不是为另一个人？

我明白,一些变量需要在嵌套类中工作,但是我创建的变量似乎工作正常,最终还是没有.

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.util.Random;

public class JColorFrame extends JFrame {

    private JPanel contentPane;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    JColorFrame frame = new JColorFrame();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public JColorFrame() {
        setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100,100,522,339);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5,5,5));
        contentPane.setLayout(new BorderLayout(0,0));
        setContentPane(contentPane);

        JPanel panel = new JPanel();
        contentPane.add(panel,BorderLayout.NORTH);

        JPanel panel_1 = new JPanel();
        contentPane.add(panel_1,BorderLayout.WEST);

        JPanel panel_2 = new JPanel();
        contentPane.add(panel_2,BorderLayout.EAST);

        JPanel panel_3 = new JPanel();
        contentPane.add(panel_3,BorderLayout.SOUTH);

        Color[] color = new Color[8];
        color[0] = Color.black;
        color[1] = Color.white;
        color[2] = Color.red;
        color[3] = Color.blue;
        color[4] = Color.green;
        color[5] = Color.yellow;
        color[6] = Color.magenta;
        color[7] = Color.orange;

        JButton btnChangeColor = new JButton("Change Color");
        btnChangeColor.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                Random random = new Random();
                int random_1 = random.nextInt(4);
                switch (random_1) {
                    case 0:
                        int random_2 = random.nextInt(8);
                        panel.setBackground(color[random_2]);
                        break;
                    case 1:
                        random_2 = random.nextInt(8);
                        panel_1.setBackground(color[random_2]);
                        break;
                    case 2:
                        random_2 = random.nextInt(8);
                        panel_2.setBackground(color[random_2]);
                        break;
                    case 3:
                        random_2 = random.nextInt(8);
                        panel_3.setBackground(color[random_2]);
                        break;

                }

            }
        });

        contentPane.add(btnChangeColor,BorderLayout.CENTER);
    }
}