java - JButton 与 imageicon "lag"

Question

滞后可能不是准确的术语，但当我将图像添加到按钮时，整个框架不会显示，至少一开始不会。重新调整窗口大小会按预期显示所有按钮。

如果没有图像，这个问题就不会发生，所以我猜测正在发生一些中间检索->加载步骤，直到发生这种情况，我才得到这个“错误”。所以我的问题是，假设这是正确的，我可以做些什么来规避/纠正它，以便一切都按预期立即显示？

代码如下:

/* Author: Luigi Vincent Exercise: 12.1 -
* Create a frame and set its layout to FlowLayout
* Create two panels and add them to the frame.
* Each panel contains three buttons. The panel uses FlowLayout
*/

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

public class Ex_1 {
    public static void main(String[] args) {
        Ex1_Layout frame = new Ex1_Layout();
        frame.setTitle("Exercise 12.1");
        frame.setSize(450, 250);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);

        ImageIcon valk = new ImageIcon("C:/MyWork/Images/valk.gif");

        JButton alpha = new JButton("Disgaea");
        JButton beta = new JButton("Riviera: The Promised Land");
        JButton gamma = new JButton("Yggdra Union");
        JButton delta = new JButton("Dissidia");
        JButton epsilon = new JButton("Valkyrie Profile", valk);
        JButton zeta = new JButton("Ragnarok Online");

        JPanel p1 = new JPanel();
        JPanel p2 = new JPanel();

        p1.add(alpha);
        p1.add(beta);
        p1.add(gamma);
        p2.add(delta);
        p2.add(epsilon);
        p2.add(zeta);

        frame.add(p1);
        frame.add(p2);

    } // End of Main    
} // End of Ex_1

class Ex1_Layout extends JFrame {
    public Ex1_Layout(){
        setLayout(new FlowLayout(FlowLayout.LEFT, 0, 0)); // Set FlowLayout, aligned left, horizontal and vertical gap of 0
    }
} // End of Ex1_Layout

Answer 1

when I add an image to a button the entire frame doesn't display, at least not at first.

在添加JFrame中的所有组件后调用frame.setVisible(true);。

---

几点:

1. 使用 SwingUtilities.invokeLater() 确保 EDT正确初始化。

   阅读更多

   • Why to use SwingUtilities.invokeLater in main method?

   • SwingUtilities.invokeLater

2. 除非您正在修改现有逻辑，否则不要扩展任何类。

   阅读更多

   • Composition over inheritance