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当我运行我的程序时，一切都按计划进行，除了我必须更改屏幕上的卡片的按钮直到鼠标悬停才会出现。我假设这是因为保存图像的任何容器都在它上面，但我不知道如何将它移动到背景中，甚至不知道我可以使用哪种容器来添加图像。

import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.util.Random;
import java.awt.event.*;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;

public class oneplayer extends JFrame {
    BufferedImage  image1, image2, image3, image4;
    Random gen = new Random();
    public void redo() {
        int p1, p2, p3, p4;
        p1 = gen.nextInt(13) + 1;
        p2 = gen.nextInt(13) + 14;
        p3 = gen.nextInt(13) + 27;
        p4 = gen.nextInt(13) + 40;
         try {
         File input1 = new File("C:/Users/Mike/Desktop/eclipse/workspace/inClass/src/" + p1 + ".png");
         File input2 = new File("C:/Users/Mike/Desktop/eclipse/workspace/inClass/src/" + p2 + ".png");
         File input3 = new File("C:/Users/Mike/Desktop/eclipse/workspace/inClass/src/" + p3 + ".png");
         File input4 = new File("C:/Users/Mike/Desktop/eclipse/workspace/inClass/src/" + p4 + ".png");
         image1 = ImageIO.read(input1);
         image2 = ImageIO.read(input2);
         image3 = ImageIO.read(input3);
         image4 = ImageIO.read(input4);
     } catch (IOException ie) {
         System.out.println("Error:"+ie.getMessage());
     }
     repaint();
}

public oneplayer() {
    JPanel buttonPanel = new JPanel();
    setLayout(new BorderLayout());
    JButton refresh = new JButton("Refresh");
    refresh.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            redo();
        }
    });
    add(buttonPanel, BorderLayout.SOUTH);
    buttonPanel.add(refresh, BorderLayout.CENTER);
    redo();
}

public void paint(Graphics g) {
     g.drawImage(image1, 20, 55, null);
     g.drawImage(image2, 96, 55, null);
     g.drawImage(image3, 172, 55, null);
     g.drawImage(image4, 248, 55, null);
}

public static void main(String args[]) {
    oneplayer frame = new oneplayer();
    frame.setTitle("Random Cards");
    frame.setSize(350, 200);
    frame.setLocationRelativeTo(null);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
}
}
4

3 回答 3

4

不要覆盖paint()方法。而是覆盖paintComponent()主容器。

称呼super.paintComponent(g)

不要扩展，JFrame而是JPanel将所有内容添加到面板并将面板设置为通常JFrame实例的内容窗格。

于 2013-02-08T13:53:40.990 回答
0

您需要在函数super.paint(g)内部paint(Graphics)调用以确保框架内的 Swing 组件正确显示。

于 2013-02-08T13:53:07.937 回答
0

尚未使用您的示例对此进行测试，但我认为您需要在覆盖 Frame 上的绘制时调用父类的绘制才能显示 Frame 的组件。像这样：

public void paint(Graphics g) {
     super.paint(g);
     g.drawImage(image1, 20, 55, null);
     g.drawImage(image2, 96, 55, null);
     g.drawImage(image3, 172, 55, null);
     g.drawImage(image4, 248, 55, null);
}
于 2013-02-08T13:53:25.810 回答