所以我想从一个类中其他类的对象调用一个类中的函数，有没有一种方法可以这样做，而不必在第二个类中创建第一个类的对象？在这种特殊情况下，我想再次从exitviewoutput类更改exitframe可见性，而不在exitviewinput类中创建对象，因为我觉得这样会产生一个无限循环。有关更多信息，请参阅以下代码：
退出框架：

package ExitView;

import javax.swing.JFrame;

import Project.GameFrame;

public class ExitFrame
{
    private int width = 500;
    private int height = 500;

    JFrame frame = new JFrame();

    public ExitFrame()
    {
        ExitViewOutput panel = new ExitViewOutput();
        frame.setContentPane(panel);
        panel.addMouseListener(new ExitViewInput(panel));
        frame.setSize(width, height);
        frame.setLocationRelativeTo(null);
        frame.setVisible(false);
        frame.setAlwaysOnTop(false);
        frame.setFocusable(false);
        frame.setUndecorated(true);
        frame.setVisible(true);
    }

    public void changeVisibility(boolean visibility)
    {
        frame.setVisible(visibility);
        frame.setAlwaysOnTop(visibility);
        frame.setFocusable(visibility);
    }
}

退出视图输出：

package ExitView;

import javax.swing.JPanel;

import java.awt.*;
import java.awt.image.BufferedImage;

import HelpFunct.HelpingFunct;

public class ExitViewOutput extends JPanel
{
    private boolean showBorders = false;

    private HelpingFunct h = new HelpingFunct();

    private BufferedImage pause = h.getImage("/pauze1.png");
    private BufferedImage kthehuNeLoje = h.getImage("/KthehuNeLoje.png");
    private BufferedImage shfaqKufijte = h.getImage("/ShfaqKufijte.png");
    private BufferedImage dilNgaLoja = h.getImage("/DilNgaLoja1.png");
    private BufferedImage tick = h.getImage("/Tick.png");
    private BufferedImage cross = h.getImage("/Cross.png");

    public void switchShowBorder()
    {
        showBorders = !showBorders;
        this.repaint(); 
    }

    public void paintComponent(Graphics g)
    {
        g.setColor(new Color(126, 96, 69));
        g.fillRect(0, 0, 500, 500);

        g.setColor(new Color(144, 114, 87));
        g.fillRect(20, 20, 460, 460);

        g.setColor(new Color(126, 96, 69));
        g.fillRect(30, 116, 299, 108);
        g.fillRect(30, 234, 299, 108);
        g.fillRect(30, 352, 299, 108);
        g.fillRect(351, 234, 108, 108);

        g.setColor(Color.black);

        g.drawRect(0, 0, 499, 499);
        g.drawRect(20, 20, 459, 459);
        g.drawRect(30, 116, 300, 108);
        g.drawRect(30, 234, 300, 108);
        g.drawRect(30, 352, 300, 108);
        g.drawRect(351, 234, 108, 108);

        g.drawLine(0, 0, 20, 20);
        g.drawLine(0, 500, 20, 479);
        g.drawLine(500, 0, 479, 20);
        g.drawLine(479, 479, 500, 500);

        g.drawImage(pause, 30, 30, 300, 66, null);
        g.drawImage(kthehuNeLoje, 30, 116, null);
        g.drawImage(shfaqKufijte, 30, 234, null);
        g.drawImage(dilNgaLoja, 30, 352, null); 

        if (showBorders)
            g.drawImage(tick, 351, 234, null);
        else
            g.drawImage(cross, 351, 234, null);
    }
}

ExitView输入：

package ExitView;

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class ExitViewInput extends MouseAdapter 
{
    private ExitViewOutput framePaint;

    ExitViewInput(ExitViewOutput framePaint)
    {
        super();
        this.framePaint = framePaint;
    }

    public void mouseClicked(MouseEvent e)
    {   
        if     (((e.getX() > 30) && (e.getX() < 30 + 300)) &&
                ((e.getY() > 352) && (e.getY() < 352 + 108)))
                System.exit(0);
        else if (((e.getX() > 30) && (e.getX() < 30 + 300)) &&
                 ((e.getY() > 116) && (e.getY() < 116 + 108)))
        {

        }
        else if (((e.getX() > 30) && (e.getX() < 30 + 300)) &&
                 ((e.getY() > 234) && (e.getY() < 234 + 108)))
        {
                framePaint.switchShowBorder();
        }
    }
}