java静态int不会触发删除框架或更改面板

Question

我正在使用NetBeans 11.2创建一个程序，其中包含一个动画。当静态变量（CurrentFrame等于176）在动画之后创建时，我希望该帧删除Jpanel，以便我可以将汽车图片添加到程序中并移动图片。所以我做了一个if声明，所以当Currentframe == 176它将移除上述面板，但无论我做什么，它都不会工作。我做了一个系统。出来打印出来看看它是否达到了176，它确实做到了。有什么问题吗？有什么建议吗？ 包装框架测试

import javax.swing.*;
import javax.swing.JFrame;
import java.awt.*;
import java.awt.event.*;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;

public class Main extends JPanel implements ActionListener {

public final Timer animate;
public static Boolean z = false;
public final ImageIcon ImageArray[];
public static int delay = 50, FrameCount = 177, Currentframe = 0;

public Main() {

    ImageArray = new ImageIcon[FrameCount];

    //Array used to store 200 Frames 
    for (int i = 1; i < ImageArray.length; i++) {

        ImageArray[i] = new ImageIcon(getClass().getResource("Cartest (" + i + ").jpg"));

        //i++ causes the Array to constantly pull up an image that i have named 
        //from numbers 1-200
    }

    animate = new Timer(delay, this);
    animate.start();
    //Setting a delay using a timer

}

public void paintComponent(Graphics g) {
    super.paintComponent(g);
    System.out.println(Currentframe);
    Currentframe++;

    ImageArray[Currentframe].paintIcon(this, g, 0, 0);
    //each time this method is called the image is going to differentiate 

}

public void actionPerformed(ActionEvent e) {
    do {
        repaint();
    } while (Currentframe >= ImageArray.length);

    //clears the graphics and images and recalls the method
}

static class Action implements ActionListener {

    

    @Override
    public void actionPerformed(ActionEvent e) {

        JFrame f = new JFrame("hello");
       
        Main s = new Main();
        f.add(s, BorderLayout.CENTER);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(1280, 760);
        f.setVisible(true);

        if (Currentframe == 176) {
            f.getContentPane().removeAll();
            f.setVisible(false);
        }

    }

}

public static void main(String[] args) throws MalformedURLException, IOException, InterruptedException {
    //Title Page
    JFrame f = new JFrame("Button Example");
    JButton b = new JButton("Click Here");

    b.setBounds(50, 100, 95, 30);

    f.add(b);
    b.addActionListener(new Action());
    f.setSize(400, 400);
    f.setLayout(null);
    f.setVisible(true);   

}
}

Answer 1

你有两个问题需要解决

第一个是应该从JFrame中删除JPanel的代码的位置：

if (Currentframe == 176) {
    f.getContentPane().removeAll();
    f.setVisible(false);
}

将ActionListener添加到JButton时，仅会检查一次此条件。所以删除这个代码。必须将此逻辑移到类Main中的actionPerformed方法

第二个问题是你的Timer。它不会仅仅通过删除JPanel自动停止运行。您必须显式地停止它（并在需要时选择性地重新启动它）

一般注意事项：不要以大写字母开头变量名。这被认为是不好的做法

解决方案是：

public void actionPerformed(ActionEvent e) {
    do {
        repaint();
    } while (Currentframe >= ImageArray.length);

    if (Currentframe == 176) {
        animate.stop();
        this.getRootPane().removeAll();
        //optional, without repainting the image which was painted last will remain visible
        //JFrame topFrame = (JFrame) SwingUtilities.getWindowAncestor(this);
        //topFrame.repaint();
    }
}